Ant Hibernation & Diapause: The Complete UK Ant-Keeping Guide

Looking for species-specific advice? Start with the Lasius niger care guide, Messor barbarus care guide, or Myrmica rubra care guide. Winter requirements vary between species.

Do ants hibernate? Many do, but not all of them need the same winter. For ants living in temperate climates, winter brings a natural period of dormancy called diapause: egg-laying slows or stops, brood development can pause, workers become less active, and the colony rests until spring.

For UK keepers this matters most with species like Lasius niger and Lasius flavus. Tropical and warm-climate ants can have very different needs. And getting diapause right doesn't mean making your ants as cold as possible. It means understanding their natural seasonal cycle and providing suitable conditions safely.

This guide covers what diapause is, which species need it, when to start, how to overwinter ants in a fridge or cool room, and what to do when spring arrives, including advice for newly caught queens, established colonies, test tubes and formicariums.

The quick answer

Question Short answer
Do all ants need hibernation? No. Winter needs depend on the species and its natural climate.
Do Lasius niger need diapause? Yes. Winter dormancy is a well-established part of their seasonal biology.
What temperature suits Lasius niger? Roughly 7–10°C is a sensible, conservative captive target.
How long should it last? Around 3–4 months is a reasonable starting point for many UK Lasius colonies.
When should I start? Commonly late October or November, guided by the colony's behaviour.
Can I use a fridge? For suitable species, yes, but you must check the actual temperature inside it.
Do ants need water during diapause? Yes. Water stays essential all winter.
Should I feed them? Deeply dormant ants usually don't forage. Partly active species may still need food.
When do I wake them? Commonly February or March for UK temperate colonies, after an appropriate winter.

These figures are practical starting points for particular groups of ants, not universal rules. Messor barbarus, for example, is usually given a milder winter rest around 10–15°C, and Camponotus nicobarensis shouldn't be refrigerated by default at all. Understand the species before choosing the winter conditions.

What is diapause?

Diapause is a biologically regulated pause in an insect's normal development or reproduction. In ants it can affect the queen's egg-laying, larval development, worker activity and the colony's overall seasonal behaviour. It isn't simply what happens when ants get too cold to move, and some species start entering their dormant state while it's still warm.

It helps to separate two terms. Diapause is an internally driven seasonal state that can begin before conditions turn unfavourable. Quiescence is a more immediate response to something like cold, and activity can return fairly quickly when conditions improve. A colony can experience both. A Lasius niger colony might begin its seasonal slowdown in a warm room, then slow down further when you cool it. The two are related but not identical.

Can ants enter diapause while it's still warm?

Yes, and recent research backs this up. A 2026 study in Functional Ecology working with five temperate ant species found that colony-level dormancy can run on an internal seasonal programme, independent of the temperature the colonies are kept at, and that dormancy itself changes how cold-tolerant workers are, separately from any cold exposure.

That fits what many keepers notice: colonies can behave as though winter has arrived while the enclosure is still warm. If your temperate ants stop producing brood in autumn, turning the heat up further isn't necessarily going to restart their development.

Why do ants need diapause?

Ants have evolved under very different conditions. In Britain and northern Europe the seasons differ a lot. Summer offers foraging, growth and reproduction, while winter brings cold and scarce food. Many temperate ants run an annual cycle that fits this, easing into dormancy as the active season ends and resuming development when conditions improve. For these species diapause isn't an obstacle for keepers to overcome. It's normal biology.

Tropical ants often stay active and keep developing year-round when conditions allow. Some still show seasonal shifts in activity or reproduction, but a slowdown isn't automatically the same as a northern European species' cold diapause. Never assume every colony belongs in a fridge.

Mediterranean ants often have seasonal winter slowdowns too, though usually milder. Messor barbarus is commonly given a winter rest around 10–15°C for two to three months, and the same caution applies to species like Crematogaster scutellaris. That's established husbandry practice, not a temperature proven optimal by controlled experiments.

Is diapause actually necessary?

For northern temperate ants, the science is clear that seasonal dormancy is part of their natural cycle, so giving them an appropriate winter is the sensible, welfare-first approach. But there's a gap between what research shows and what gets repeated in the hobby.

What happens if you skip it?

You'll hear that skipping diapause will kill your queen, shorten her life dramatically, permanently damage her fertility, or collapse the colony the next year, usually said with total confidence. In fact the available research doesn't show that missing a single winter inevitably causes any of those things. That doesn't make skipping harmless; controlled long-term studies on deliberately omitting individual winters are simply limited. A colony surviving without a winter also doesn't prove that skipping it is biologically equivalent to following its natural cycle.

I wouldn't deliberately skip diapause just to get faster growth for a species whose winter dormancy is well supported. The aim is a healthy colony over many years, not the most workers in one season. If you've already missed a winter, though, don't write your queen off. Correct the husbandry and plan the next cycle properly.

Which species need diapause?

Treat this table as a practical starting point for UK keepers, not a substitute for researching your colony's origin.

Species Winter approach Temperature guidance
Lasius niger Genuine winter diapause About 7–10°C, commonly 3–4 months
Lasius flavus Genuine winter diapause About 7–10°C
Myrmica rubra Genuine winter diapause About 7–10°C
Formica fusca Genuine winter diapause About 7–10°C
Temnothorax nylanderi Temperate overwintering Cool winter; 7–10°C is a cautious husbandry estimate
Messor barbarus Milder seasonal winter rest Common husbandry: about 10–15°C
Crematogaster scutellaris Milder seasonal reduction Common husbandry: about 10–15°C
Camponotus nicobarensis No universal cold diapause established Don't refrigerate by default
Camponotus fedtschenkoi Requirements insufficiently established Origin matters; no reliable universal target
Camponotus morosus Requirements insufficiently established Don't prescribe a precise figure without provenance

For temperate species, research has shown dormancy and successful cool overwintering in several European ants, but nobody has established the single temperature that gives the best long-term result for every UK population. For Mediterranean species, figures like 10–15°C rest largely on keeping experience and knowledge of the native climate. For poorly studied exotics, a precise number can look helpful while creating false confidence. When the evidence is thin, it's better to say so.

Lasius niger: what the research says

Lasius niger is one of the most commonly kept UK species and one of the few with useful overwintering research.

A 2015 study of Finnish Lasius niger compared overwintering at 2°C with 7–8°C. Newly mated founding queens survived about equally well at both temperatures, and queens kept at 2°C held on to more body fat, which suggests lower energy use. But in one-year-old colonies, worker survival was worse at 2°C than at 7–8°C. So a colder winter doesn't automatically give a better result for every member of the colony.

That's the basis for suggesting roughly 7–10°C as a conservative captive target for many UK Lasius niger colonies. It's an evidence-informed practical judgement, not a proven species-wide optimum. The research doesn't show 8°C is perfect for every British colony, or that 10°C always beats 5°C.

Is 5°C too cold? Not necessarily, and plenty of keepers use around 5°C. There's just no good reason to assume it's better than a stable 8°C because it's colder. What matters is avoiding extremes, preventing freezing and keeping the colony hydrated. An accurately controlled cooler holding about 8°C may well beat an ordinary food fridge that drifts unpredictably towards freezing.

How long? Around three to four months is a reasonable starting point, typically from about November to late February or March. The calendar is a framework, and the colony's behaviour should inform your decisions as well.

When should ants start diapause in the UK?

For many British temperate species the transition starts in autumn. You might see workers foraging less, less interest in protein, egg-laying slowing or stopping, larvae staying at the same stage for longer, less movement around the nest, and more workers clustering in the nesting chamber. No single sign confirms diapause. Ants might refuse protein simply because there's little developing brood, so look for a combination of changes over time.

Period Typical approach for temperate UK species
September–October Watch for slowing development and reduced feeding; plan winter accommodation.
Late October–November Prepare for diapause as the colony moves toward dormancy.
November–February Keep cool, stable conditions, with water and temperature monitoring.
February–March Begin spring recovery after an appropriate winter.
Spring onward Resume feeding and active-season care as the colony wakes.

It's a planning guide rather than a fixed timetable. Some colonies enter dormancy earlier or later, and artificially heated colonies may behave differently from those following natural seasonal temperatures.

Still active in November? Some movement is compatible with diapause, since a worker wandering the nest doesn't mean the colony can't enter winter dormancy. Sustained brood production and vigorous foraging might suggest it hasn't fully slowed yet. Check the species and watch the overall pattern, and don't keep cutting the temperature just to force every worker to freeze in place.

Should newly caught queens go through diapause?

For temperate species like Lasius niger, yes. Founding queens can go through their normal first winter even without workers, and the Finnish overwintering study included newly mated queens, so a founding queen isn't automatically exempt. A queen caught in July might have workers by autumn or only brood, and worker count alone shouldn't decide whether she overwinters.

If she hasn't laid, first check she's healthy, correctly identified and kept appropriately. A lack of eggs can come from disturbance, mating status, seasonal timing or unsuitable conditions. If the species normally has winter dormancy, a workerless queen shouldn't be kept warm all winter in the hope of forcing eggs. Don't apply this to tropical queens without checking the species. If you're new to founding colonies, read our guide to what to do after catching a queen ant.

Preparing your colony for diapause

Preparation matters as much as the winter temperature. A healthy colony with reliable water, clean surroundings and a stable environment is far better placed for winter than one moved into a fridge without checks.

Confirm the species' needs. Decide whether the colony needs a genuine cool winter, a milder seasonal rest, or no deliberate cold diapause. If the species has a wide range, try to find where the breeding population came from. A care sheet written for Lasius niger doesn't automatically fit every Camponotus or Messor.

Reduce supplementary heating. For a temperate species on a heat cable or mat, wind the extra heat down gradually as the colony slows, rather than responding to falling brood production by turning it up. For detailed advice, see our ant colony heating guide.

Keep feeding while they're active. There's no need to starve ants before winter. Offer carbohydrates and protein while they're being accepted, then reduce portions as foraging drops, and clear leftovers that could spoil. Seed-eating species on a milder rest can keep dry seeds available.

Check the water supply. This is one of the most important steps. For a test tube, check how much water remains, whether the cotton is positioned and moist, whether the tube leaks, whether condensation is unsafe, and whether the reservoir will last the winter. For a formicarium, check the hydration system is working, the nest isn't getting too dry or oversaturated, you can safely top up during winter, and where appropriate there's a separate drinking-water source. Don't begin a long winter with a nearly empty tube. If needed, offer a fresh one and let the colony move before cooling.

Remove obvious waste. Clear dead feeders and accessible rubbish, and look for flooding or serious mould. You don't need to dismantle a healthy colony to remove every mark, and disruption right before winter creates problems of its own.

Check the colony's condition. If there's rapid unexplained worker loss, severe dehydration or flooding, fix that first. Diapause isn't a treatment for an unhealthy colony.

Test the winter location. Measure its temperature over several days before moving anyone in. A temperature logger beats a single reading because it records fluctuations.

Should I cool gradually?

It's sensible husbandry, but not a scientifically established requirement with one exact schedule. Some lab experiments move colonies directly between controlled temperatures, and there's no strong evidence that every species needs exactly seven, ten or fourteen days in a transitional range. A staged reduction still has practical benefits: it gives you time to check the winter environment, watch the colony, and limit sudden condensation. For a temperate species, a reasonable sequence is normal room temperature, then a cooler indoor spot, then the final winter location, with perhaps a few days at the intermediate stage. Avoid repeated warming and cooling once the colony has settled.

Hibernating ants in a fridge

Fridges are popular for overwintering temperate ants because they give controlled temperatures independent of the weather. But the dial doesn't tell you what temperature your ants are actually experiencing.

UK research that logged temperatures in 43 household fridges found that a single reading is a poor guide to what a fridge really does, with substantial variation between fridges and over time. So a fridge that seems to run at 8°C might sometimes get much colder, and the back wall can differ from the area near the door.

Ideally use equipment that can hold the right temperature for your species. A dedicated temperature-controlled cabinet or a suitable wine cooler can work well if you've verified how it actually performs. A household food fridge can work for suitable species too, but is often set colder than the 7–10°C target for Lasius niger.

Preparing the fridge:

  1. Put a temperature logger inside, where the colony will actually sit.
  2. Record several days of normal operation before using it.
  3. Check the minimum and maximum, because an average can hide dangerous dips toward freezing.
  4. Keep tubes away from cooling plates and surfaces much colder than the surrounding air.
  5. Use secure, ventilated secondary containment to organise and protect the tubes.
  6. Limit disturbance, since a frequently opened fridge brings more light, movement and temperature swings.
  7. Keep monitoring all winter, because equipment can develop faults.

Don't use a freezer. Short-term cold tolerance in experiments isn't evidence that prolonged freezing is safe.

A family fridge can work, but it gets opened often, vibrates, and has colder zones near cooling surfaces, and there are hygiene concerns with keeping insects alongside food. If you do use one, keep the colony securely contained and separate from food. A dedicated unit is better where practical. Ants still respire during dormancy, so don't seal a colony in an airtight container for months. Use a secure setup that stops escapes while allowing gas exchange.

Garage, shed, cellar or cool room

A garage or shed can work, but the question isn't whether the space feels cold. It's whether it stays within a suitable range. An unheated garage might hold 8°C for much of the winter and still drop below freezing in a cold snap, and a shed can swing even more. Unlike a natural underground colony, a test tube or small formicarium has very little buffering against rapid change.

Before using one, monitor it through both cold and mild spells, check the minimums as well as averages, think about what happens in a sudden frost or warm spell, and have a backup location ready. Never assume a captive colony can handle whatever a British winter produces just because the species lives outdoors here. Wild ants benefit from the insulation and thermal stability of their natural nests, and a test tube on a garage shelf is a very different situation.

A stable cool room or cellar can be excellent, especially for species needing a milder rest. A space near 12°C might suit Messor barbarus and be unsuitable for a species needing a cooler winter. As always, monitor the real temperature and choose by species.

Water during diapause

Water remains essential all through diapause. Dormancy reduces activity and changes metabolic needs, but doesn't remove water loss or the need for proper hydration, and published ant-husbandry protocols continue providing water and checking moisture during cold storage.

Test tubes give a humid nesting space and a reservoir. Before winter, check there's enough water, and during winter check the reservoir hasn't dried out, leaked or flooded the nest. If a tube is drying, offer a fresh hydrated one rather than assuming the colony can wait until spring.

Gypsum and plaster nests need particular attention, because moisture depends on the design, hydration system, temperature and surroundings. A cooler nest may lose water more slowly than in summer, but won't stay hydrated indefinitely, and adding your usual summer amount of water could leave it too wet. Hydrate according to the nest's actual condition, not a fixed summer routine. For Antastic Tom gypsum nests, monitor the insert and hydration system, keep moisture suitable, avoid flooding, and where appropriate provide a separate accessible drinking source.

Nest humidity and drinking water aren't the same thing. A nest can have humid air without a reliable drinking source, and species that prefer drier nesting conditions still need water.

If a tube runs out of water, don't leave it until spring if dehydration is becoming a risk. Offer a fresh tube with a suitable reservoir and a safe way to move. In an urgent case a careful relocation may be necessary, weighing that risk against leaving the colony without water.

Feeding during hibernation

Deeply dormant temperate ants like a Lasius niger colony in genuine winter dormancy usually show little or no interest in food. Routine protein feeding isn't needed while brood development and foraging are suspended, and dead insects left in an outworld just create waste. Carbohydrate feeding can generally pause during deep inactivity, but water must stay available.

If workers do begin foraging during a warmer spell, a very small carbohydrate offering is fine, removed promptly if uneaten. Don't warm the colony repeatedly just to get them feeding.

Mediterranean species like Messor barbarus on a milder winter may stay intermittently active. Dry seeds can stay available for seed-eaters and drinking water should always be provided. Reduce other feeding as demand falls rather than imposing an absolute no-feeding rule.

Tropical species with a seasonal slowdown but no cold diapause should keep getting species-appropriate care, with feeding adjusted to actual consumption. Reduced activity alone isn't a reason to put tropical ants in a fridge.

Checking on them

You want to catch problems without constantly disturbing the colony. For a new winter setup, a brief look every one to two weeks is a reasonable starting point, more often if water reserves are low or something already needs watching. If you're using a logger, keep checking its readings. One published Lasius niger lab protocol checked colonies weekly for water, mould, moisture and condensation during cold storage. That doesn't set a universal schedule, but it shows good winter care isn't putting the ants away and forgetting them.

On each check, ask: is the temperature in range, is there enough water, is the tube or nest flooding, is there heavy condensation, is mould becoming a real problem, are there unexpected dead workers, is the colony securely contained, and does anything need action now? Keep inspections brief, and don't handle and turn every tube.

What's normal, and what isn't

Ants can look remarkably inactive in winter, which is unsettling if you're used to watching them forage all summer. Usually normal: workers sitting in tight groups, very little movement, the queen slowing right down, little or no interest in food, no new eggs, larvae staying unchanged for long periods, the odd worker moving around, and brief activity after disturbance or warming.

Warning signs: rapidly rising worker deaths, a dry reservoir, flooding, temperatures repeatedly outside the intended range, heavy condensation producing droplets, severe mould spreading into occupied areas, a completely dry nest, or any sign of environmental failure. Cold ants can be very slow to respond, so don't keep warming the colony to check the queen's alive.

Troubleshooting

Ants still moving in the fridge. Not a problem on its own. Diapause isn't paralysis. Check the species and measured temperature, and don't keep cooling to make them motionless.

The queen isn't moving. A deeply inactive queen can look nearly lifeless at low temperatures. Avoid repeated disturbance, check conditions, and look for obvious problems rather than assuming she's dead.

Workers dying. An occasional death is normal, especially in an older colony, but a sudden rise needs investigating. Check temperature history, water, condensation, flooding, ventilation and general nest condition, and fix whatever's wrong.

Mould. A small patch isn't a colony-ending emergency. Remove accessible decaying food. If it's spreading through occupied areas, contaminating water or clearly compromising the colony, provide a clean alternative. Don't dismantle a healthy nest for every discoloured patch.

Nearly empty reservoir. This needs action: a fresh hydrated tube or another suitable water source. If the colony's at immediate risk, waiting until spring isn't acceptable.

Condensation in the tube. It happens when temperatures change. Check nothing is pooling around the ants, stabilise the temperature, and avoid repeated warming and cooling.

The fridge got too cold. Move the colony to a safe, stable spot suitable for its species. If it may have gone below freezing, let the ants recover gradually before judging them, because unresponsive workers right after extreme cold aren't necessarily dead. Prolonged freezing is a serious risk, though, and isn't normal winter husbandry.

The fridge stopped working. Check the temperature history if you have it, arrange a stable alternative, and avoid shuttling the colony between warm and cold spots while you decide. A short warm spell doesn't necessarily mean the whole winter is lost.

I accidentally warmed them. A brief warming doesn't automatically end diapause. Restore stable, appropriate conditions if the colony's still meant to be overwintering, and avoid repeated swings.

Larvae still present. Often entirely normal. Several temperate species overwinter with larvae in arrested development, and the 2026 study observed arrested larvae in dormant colonies of several species. Larvae alone aren't a reason to prevent diapause.

Eggs or pupae present. Take a little more care, since overwintering brood stages vary by species. Check the species' normal cycle and whether the colony is still actively producing brood, and don't discard brood or make abrupt temperature changes.

A queen with no workers. For temperate species like Lasius niger, being workerless doesn't mean skipping winter. Founding queens have been overwintered in controlled research. Follow the species' biology and make sure the tube has reliable water.

Bringing ants out of diapause

Spring recovery is a transition, not a switch.

  1. Confirm the winter is done. Check the species' needs, how long the colony has been cool, and whether there were big interruptions. For many UK Lasius colonies, February or March is a reasonable time to end a winter that began in autumn.
  2. Check water first. Activity and water use rise as temperatures do.
  3. Warm gradually. Move to an intermediate cool spot if practical, then let the colony return to normal room conditions over several days. It's sensible husbandry, though there's no scientifically established warming schedule for every species.
  4. Watch for activity. Workers should gradually become more active and may start exploring the outworld or tube entrance. Avoid excess disturbance.
  5. Offer carbohydrates once workers start foraging, removing uneaten food as needed.
  6. Reintroduce protein as activity and brood development resume, in small portions rather than overwhelming a small colony.
  7. Bring back supplementary heat if the colony normally gets it, once it's settled into active conditions, keeping gradients and avoiding overheating. See Heating an Ant Colony.

When will the queen lay again? There's no universal timetable. In the 2026 experiment, colonies coming out of a cool winter generally resumed laying, foraging and larval growth within roughly a week or two, which is a useful reference but not a deadline for your queen. Species, colony size, queen condition, nutrition and spring temperatures all matter. If eggs don't appear immediately, make sure the colony has water, suitable food, appropriate temperatures and minimal disturbance. If it stays completely inactive for many weeks in suitable spring conditions, reassess the husbandry rather than just turning up the heat.

A bigger nest after diapause? Not automatically. Coming out of winter doesn't mean the colony suddenly needs more space, and a small founding colony may be perfectly comfortable staying in its test tube. Moving ants unnecessarily is stressful and makes hydration harder. Read our guide to when ants should move into a nest first.

Common myths

"All ants need hibernation." False. Different climates and species give different seasonal needs, and many tropical ants don't need a cold winter at all.

"5°C is perfect for every ant." False. Temperature effects vary even among temperate ants, and Mediterranean and tropical species shouldn't automatically get northern European conditions.

"The colder the winter, the better." False. Research on Lasius niger found poorer worker survival at 2°C than at 7–8°C in the colonies studied.

"A queen without workers doesn't need diapause." False as a universal rule. Founding queens of temperate species like Lasius niger can still go through normal seasonal dormancy.

"Skipping one diapause always kills the queen." Unsupported. There isn't enough controlled long-term evidence to say that, though an appropriate diapause is still recommended where the biology supports it.

"Ants don't need water in winter." False. Water and proper hydration stay essential.

"Never feed ants in winter." Too absolute. Deeply dormant colonies usually don't forage, but partly active Mediterranean species may keep feeding.

"If workers are moving, it isn't diapause." False. Dormancy isn't total immobility.

"If they survive without diapause, it was unnecessary." Wrong conclusion. Survival alone doesn't show that normal seasonal physiology and long-term performance are unaffected.

"A garage is always better than a fridge." False. What counts is whether the spot gives the right, measured, stable conditions for the species.

FAQ

Do ants hibernate in the UK? Many native species enter winter dormancy, with Lasius niger and Lasius flavus two familiar examples.

*What temperature should I hibernate Lasius niger at?* Roughly 7–10°C is a conservative, research-supported starting point, though no exact optimum is established for every British population.

How long do ants hibernate? It depends on the species. About three to four months is reasonable for many UK temperate colonies.

Can ants hibernate in their test tube? Yes, a tube with a reliable water reservoir can be a good winter home for a queen or small colony. Check the water before and during winter.

Can I leave the outworld connected? Often, provided it's secure and suits the winter location. For a larger nest, think about how you'll maintain water and inspect safely. There's no universal need to disconnect it.

Do ants need light during diapause? Dormant colonies generally do best with minimal disturbance, and bright light and frequent inspection don't help. But light and photoperiod play different roles across species, so don't assume total darkness is itself the trigger.

Can different species share a winter fridge? Only if their temperature needs genuinely overlap and the equipment can hold a suitable environment for all of them. A temperature right for Lasius niger isn't right for Messor barbarus or Camponotus nicobarensis.

*Should I fridge Messor barbarus?* Not automatically. They're normally given a milder rest around 10–15°C, and an ordinary food fridge may be much colder than intended.

What if my queen lays eggs in winter? Review the species' seasonal biology and the actual temperature. One observation doesn't justify abrupt cooling or heating.

Can I skip diapause the first year? For temperate species like Lasius niger, the first year isn't automatically an exception, and founding queens have been included in overwintering experiments.

When should I take them out? For UK Lasius colonies, commonly February or March after an appropriate winter, depending on when it started and the species' needs.

Do I feed them straight after diapause? Offer a small carbohydrate meal once workers become active and start foraging, add protein as brood development resumes, and keep water available throughout.

Our approach to diapause

Ant keeping is often about growth: more heat, more feeding, bigger nests, more workers. But faster growth isn't the same as better husbandry. For species with an established seasonal cycle, diapause is a normal part of keeping the colony healthy long term. That doesn't mean frightening beginners with claims that one missed winter will kill their queen. It does mean accepting that ants are living animals with rhythms that don't always match our wish for constant activity, and where the evidence is thin, saying so instead of inventing a precise temperature or timetable.

The one rule to take away: match winter care to the ant's biology, not to a universal hibernation number.

Final checklist

Before winter

  • ☐ Confirm the species and its seasonal requirements
  • ☐ Watch for the natural autumn slowdown
  • ☐ Reduce supplementary heating where appropriate
  • ☐ Keep feeding normally while food is accepted
  • ☐ Remove uneaten protein and obvious waste
  • ☐ Check the water reservoir or nest hydration
  • ☐ Verify the winter location's temperature with a logger
  • ☐ Make sure the enclosure is secure and ventilated

During winter

  • ☐ Keep temperatures stable and in range
  • ☐ Monitor water and moisture
  • ☐ Check for flooding, heavy condensation and serious mould
  • ☐ Avoid unnecessary disturbance
  • ☐ Investigate unexpected deaths or temperature failures

In spring

  • ☐ Confirm an appropriate winter has passed
  • ☐ Check water before warming
  • ☐ Warm gradually toward active-season conditions
  • ☐ Offer carbohydrates as workers start foraging
  • ☐ Resume protein as brood demand returns
  • ☐ Reintroduce species-appropriate heating if needed
  • ☐ Give the colony time to recover

Species-specific reading: Messor barbarus Care Guide — Seeds, Setup and Winter Rest.

For species-specific advice on founding, feeding, temperature, multiple queens and seasonal care, see our Camponotus nicobarensis care guide.

For species-specific evidence on endogenous dormancy and overwintering larvae, see the Myrmica rubra care guide.

Further guides

For the developmental stages that seasonal dormancy can affect, see our Ant Life Cycle Explained guide.

Scientific references

Scientific review: October 2026. Temperatures in this guide distinguish experimental evidence from husbandry recommendations.