Camponotus care guide

Camponotus ant care overview

Camponotus are commonly called carpenter ants and they are the ants most American keepers start with. The genus is enormous, with more than 1,000 described species worldwide and dozens found across the United States, from the humid forests of the Southeast to the open desert of the Southwest. They are large, slow to anger, tolerant of keeper mistakes, and they build colonies with a visible range of worker sizes.

Camponotus are generally considered beginner friendly. Queens found their colonies sealed away with no help needed, workers are big enough to watch without a magnifier, and the ants accept a simple diet of sugar water and insects. The main things that trip up new keepers are impatience with slow early growth and skipping winter rest on temperate species.

This guide covers the genus as a whole. It applies to species such as:

• Camponotus castaneus, the ruby chestnut carpenter ant
• Camponotus pennsylvanicus, the black carpenter ant
• Camponotus discolor, the bicolor carpenter ant
• Camponotus ocreatus, the orange desert carpenter ant
• Camponotus sansabeanus, the southwestern carpenter ant

Care is similar across the genus with one important exception, covered below: species from cold winter regions need a real winter rest, and species from hot dry regions mostly do not. You can see everything we currently have available in our carpenter ants collection.

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Quick Camponotus care summary

• Difficulty level: beginner to intermediate
• Best temperature: 75 to 82 degrees Fahrenheit for temperate species, 80 to 86 for desert species
• Humidity: a gradient, with one damp chamber and the rest of the nest dry
• Founding: fully claustral, no food needed until the first workers appear
• Time from egg to first worker: 5 to 10 weeks depending on heat
• Diet: liquid sugars plus insect protein
• Growth rate: slow the first year, then accelerating
• Colony size: hundreds within two to three years, thousands in mature colonies
• Diapause: 3 to 4 months near 40 degrees Fahrenheit for temperate species, little or none for desert species
• Sting: none. Carpenter ants cannot sting, though large majors can deliver a pinching bite and spray formic acid

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Natural habitat and behavior

Camponotus species are found in:

• dead standing trees, stumps, and fallen logs
• soil under stones and buried wood
• desert scrub, where many species nest in soil rather than wood

The common name is misleading in one respect. Carpenter ants excavate galleries in soft, damp, decaying wood, but they do not eat it. They chew it out and discard the shavings. The wood is shelter, not food, which is why a colony in captivity does nothing worse in a wooden nest than it would in gypsum.

In the wild, Camponotus are mostly nocturnal and do the bulk of their foraging in the hours right after sunset. They tend honeydew producing aphids and scale insects for sugar and hunt or scavenge insects for protein. Colonies are almost always monogyne, meaning a single queen, and that queen can live well over ten years in captivity. A well kept Camponotus colony is a long project, not a season.

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Temperate species versus warm climate species

This is the one fork in Camponotus care that matters most, and getting it wrong is the most common reason a colony stalls or dies over the winter.

Temperate species

Species from regions with a genuine cold winter need a genuine winter rest. This includes C. pennsylvanicus, C. nearcticus, C. modoc, C. discolor, and northern populations of C. castaneus. Kept warm year round, these colonies often slow down anyway, stop accepting food, and lose workers. They are running an internal calendar and it does not care what your thermostat says.

Warm climate and desert species

Species from the desert Southwest and the Gulf Coast need little or no diapause. This includes C. ocreatus, C. sansabeanus, C. floridanus, and Florida sourced C. castaneus. These colonies can be kept warm and fed year round, and will often keep producing brood through the winter. Most keepers still give them a light rest of eight to twelve weeks at cooler room temperature, which is enough.

When in doubt, look at where your queen came from. A queen collected in Michigan and a queen collected in Arizona are not on the same schedule even if they are closely related.

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Founding Camponotus queens in a test tube setup

Camponotus queens are fully claustral. A mated queen seals herself in, lays her first eggs, and raises them entirely on her own body reserves, metabolizing her wing muscles and fat. She needs nothing from you but water, darkness, and to be left alone.

Recommended founding conditions:

• a 16 to 20 mm test tube with roughly one third water held back by a tight cotton plug
• a second cotton plug at the open end, with the queen in the air space between
• complete darkness, achieved with foil, a cloth, or a drawer
• gentle warmth on one end of the tube only, so she can pick her spot

Feeding during founding

Do not feed a founding Camponotus queen before her first workers emerge. Food in the tube molds, and mold in a founding tube kills queens. Once two or three workers are walking around, start offering small amounts of sugar water and a single fruit fly, and build from there.

Founding timeline

• first eggs appear 7 to 14 days after the queen settles in
• eggs to the first workers takes 5 to 10 weeks, commonly 7 to 8 weeks at good temperature
• the first batch is small, often only 3 to 10 workers, and they will be undersized

Those first tiny workers are called nanitics and they are supposed to look wrong. Later generations come out at full size.

Resist checking on her. Opening the foil and moving the tube is the leading cause of a queen eating her own brood. Look once every week or two and no more.

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Temperature and heating requirements

Heat is the single biggest lever on Camponotus growth rate. A colony at 70 degrees and a colony at 80 degrees are on completely different trajectories.

Ideal temperature range:

• temperate species: 75 to 82 degrees Fahrenheit, with the bulk of the nest in the mid to upper 70s
• desert species: 80 to 86 degrees Fahrenheit
• below 70 degrees, brood development slows sharply
• above 90 degrees is dangerous and can cook a colony in an enclosed nest

Always heat part of the nest, never all of it. Run a heat cable or mat against one end or one side and leave the far end at room temperature. The ants will carry brood to whatever spot they prefer, and that self selection is more reliable than any number you or a care sheet can pick for them.

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Humidity and hydration

Published humidity figures for Camponotus disagree wildly, with reputable sources recommending anywhere from 30 percent to 90 percent. The disagreement resolves once you stop thinking about a single number. Camponotus want a gradient, and they are very good at choosing from it.

Provide:

• one reliably damp chamber or hydration zone where brood can be kept
• several dry chambers the colony can retreat to
• constant access to drinking water, separate from nest moisture
• a drier outworld than the nest

Avoid:

• a nest that is damp end to end with nowhere dry
• standing condensation on the nest glass
• letting a test tube or hydration chamber run completely dry

Read the ants rather than the hygrometer. If brood is piled in the wettest corner, the nest is too dry overall. If the colony has abandoned the damp side entirely and workers look sluggish or the nest smells sour, it is too wet. Camponotus tolerate a drier nest than most people expect, and far better than they tolerate a soaked one.

Reservoirs, water delivery methods, reading the brood pile as a humidity gauge and mold control are covered in depth in our hydration and humidity guide.

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Feeding Camponotus ants

Camponotus feeding is simple. Sugar keeps the adult workers running, protein builds brood. Both need to be present. For a fuller breakdown of foods and portions, see our ant feeding guide.

Sugars

Offer sugar constantly, or at minimum every one to three days. Good options:

• sugar water at roughly one part sugar to three parts water
• honey water, diluted so it does not trap workers
• ByFormica Sunburst nectar or a similar prepared nectar

Deliver it in a feeder or on a small piece of cotton. Never put out undiluted honey in an open dish, because workers drown in it.

Protein

Feed protein two to three times a week for a small colony, and near daily once there is a large brood pile. Good options:

• flightless fruit flies, which are the preferred food for most Camponotus
• small dubia roach nymphs
• cricket pieces
• mealworms, cut open so the ants can get inside

Scale portions to brood, not to worker count. A colony with no larvae will largely ignore insects, and that is normal rather than a problem. Pull uneaten protein within 24 to 48 hours before it molds.

What to skip

• wild caught insects, which can carry pesticide residue
• seeds, which Camponotus do not harvest
• gel farms, which provide neither real food nor a workable nest

A well fed Camponotus worker has a visibly swollen, stretched gaster. Flat, shrunken looking workers mean the colony needs more sugar.

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Nesting and moving out of the test tube

Move a Camponotus colony into a formicarium only when:

• the colony fills roughly two thirds of the test tube
• there are enough workers to relocate all the brood efficiently, usually 20 to 50
• the tube is drying out, molding, or fouled

Moving too early is a much more common mistake than moving too late. A small colony in a large empty nest struggles to hold humidity and often refuses to settle.

Preferred nests:

• gypsum, Ultra-Cal, or aerated concrete nests with a hydration chamber
• cork or wood nests, which suit the genus naturally
• quality 3D printed acrylic nests with a separate water reservoir
• a tub and tube setup as an intermediate step for 5 to 50 workers

Keep absorbent substrate in the outworld. Camponotus spray formic acid when disturbed, and it accumulates in a sealed plastic box. Use Fluon or talc on the outworld walls, because large majors climb well and will find any gap.

Nest material choice, outworld and barrier setup, and the four ways to move a colony are covered step by step in our nest setup and moving guide.

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Polymorphism and worker castes

One of the main reasons keepers pick this genus is that a mature Camponotus colony contains workers of many sizes, produced along a continuous range rather than in separate classes.

• Minors, roughly 5 to 9 mm, handle brood care and most foraging
• Medias, roughly 8 to 12 mm, do general work
• Majors, roughly 10 to 18 mm, have oversized heads and jaws and handle food processing and defense
• Queens, roughly 16 to 22 mm depending on species

Majors do not appear in a young colony. Most colonies produce their first real majors somewhere in the second year, once the workforce is large enough and feeding has been consistent. Seeing them show up is the clearest sign the colony has turned the corner.

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Hibernation and diapause

For temperate Camponotus, diapause is required, not optional. Skipping it produces a colony that slowly declines over years instead of growing.

How to do it:

• start when the colony slows on its own, stops foraging, and workers look fat
• feed heavily for two to three weeks beforehand
• cool gradually over a couple of weeks rather than moving them straight into the cold
• hold at 38 to 45 degrees Fahrenheit for 3 to 4 months
• a refrigerator or a thermostat controlled wine cooler both work well
• check the water supply every few weeks, since a tube running dry in diapause kills colonies
• warm back up gradually and feed well for several weeks afterward

Two cautions. Never let the temperature reach freezing. And do not start diapause with pupae in the nest, because pupae do not survive it, while eggs and larvae overwinter fine.

Diapausing Camponotus look alarming. Workers and even the queen curl up, stop moving, and appear dead for months. That is normal for the genus and not a reason to warm them early.

Desert and Gulf Coast species need far less. Pull the heat source for eight to twelve weeks at cooler room temperature and let the colony idle. No refrigeration required.

The full procedure, including the ramp down, hydration during cold storage and the spring wake up, is in our seasonal care guide.

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Species specific Camponotus notes

Camponotus castaneus

• uniform amber to chestnut coloration, one of the best looking North American species
• fully claustral, monogyne, 55 to 70 days from egg to worker
• northern stock needs 2 to 4 months of diapause, Florida stock needs little
• up to roughly 100 workers in a strong first year
• available as our ruby chestnut carpenter ant

Camponotus pennsylvanicus

• the classic large black carpenter ant of the eastern United States
• beginner friendly, very tolerant, workers 6 to 12 mm with majors reaching 18 mm
• mandatory 3 to 4 month diapause near 40 degrees Fahrenheit
• slow for the first year or two, then into the hundreds by year three
• available as our black carpenter ant

Camponotus discolor

• reddish orange head and thorax against a black gaster
• active and inquisitive, slightly hardier than some larger relatives
• needs a 3 to 4 month winter rest, and expect workers to curl up during it
• nest moderately humid, outworld drier
• available as our bicolor carpenter ant

Camponotus ocreatus

• southwestern desert species, orange and black
• runs warmer than temperate species, 80 to 86 degrees Fahrenheit
• little to no true diapause, can be grown close to year round
• good choice for a keeper who does not want to manage a refrigerator
• available as our orange desert carpenter ant

Camponotus sansabeanus

• bicolored southwestern species, reddish body with a darker gaster
• handles warm dry conditions well, 72 to 86 degrees Fahrenheit
• light diapause only, generally 10 to 12 weeks with the heat removed
• Texas populations need noticeably less winter rest than northern Camponotus
• available as our southwestern carpenter ant

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Common Camponotus care problems and solutions

For symptoms this table does not cover, work through our troubleshooting guide.

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Are Camponotus ants good for beginners

Yes. Carpenter ants are the most commonly recommended starting genus in the United States, and for good reason. They:

• cannot sting
• found their colonies fully claustral, so there is little to get wrong early
• are large enough to observe easily
• eat a simple diet of sugar water and fruit flies
• produce a striking range of worker sizes as they mature

The tradeoff is patience. A Camponotus colony does not explode in its first season the way some genera do, and temperate species require you to put them in a refrigerator for a third of every year. Keepers who want faster visible results often start with a desert species instead and keep it warm year round.

If you have questions or need any assistance with your carpenter ant colony please do not hesitate to Contact Us!

Carpenter ants are a good first genus partly because they are slow, and keepers who want visible progress in year one often run big-headed ants at the same time. Once you are comfortable with feeding and formicarium management, the usual step up is a fungus grower. Start with the leafcutter ant care guide, and note that the diapause and heating habits from this page do not carry over.

Shop our Carpenter Ants: Browse all Carpenter Ant species including Ruby Chestnut Carpenter Ants, Black Carpenter Ants, and Bicolor Carpenter Ants.

Related guides: Hydration and humidity, nest setup and moving, seasonal care and diapause, and troubleshooting. For another temperate genus with the same diapause requirement, see the Formica care guide. See all our ant care guides.

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