Do Green Tree Frogs Hibernate? What the Evidence Shows

American green tree frogs (Dryophytes cinereus) become inactive in cold months, especially in the north, and shelter in places such as rock crevices and bird houses. Scientists often call this winter dormancy brumation, not hibernation. Direct studies of their winter habits are thin, so sources only say they may overwinter in upland areas near wetlands. In warm southern areas they can stay more active.

People often ask this after finding a green tree frog in a bird house in autumn. The honest answer is that winter life of this frog is not well documented.

This page explains what published sources say, what they leave out and how it differs for pet frogs. It covers the American green tree frog of the United States.

How this was made: prepared with AI assistance and checked against the sources listed at the end. Images are AI-generated illustrations, not photographs of real animals or products.

Key Takeaways

• Green tree frogs are often inactive in colder months, especially in the north.
• Reported winter shelters include rock crevices and bird houses.
• Detailed wild winter studies are limited.
• Amphibian winter dormancy is usually called brumation.
• Captive frogs become lethargic below about 16 C (61 F).
• Related frog species may differ, so avoid copying their winter habits.

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Hibernation or brumation?

Washington State University’s Ask Dr. Universe column describes brumation as the amphibian and reptile version of hibernation. Frogs slow down, live on stored fat and need very little oxygen.

Many pet sites use the two words as if they meant the same thing. In this article, “winter dormancy” covers both. The key point is that a cold frog is not truly asleep like a mammal. It is slowed down and relies on its surroundings staying above freezing.

What the sources say about green tree frogs

The USA National Phenology Network says green tree frogs are most active on warm, rainy nights and are often inactive in colder months, particularly in the north. It adds that little is known about their habits outside the breeding season and suggests they may overwinter in upland places near wetlands.

The Virginia Herpetological Society says seasonal migrations are unknown. It lists reported winter shelters as rock crevices, bird houses and human litter such as tin cans. It also notes that juveniles move from breeding areas into wooded hillsides and open fields.

Neither source describes the frog burying itself or sitting at the bottom of a pond. If you read that elsewhere, check the original source.

How other frogs survive winter

General guidance helps explain the options, but it does not describe this species. Dr. Universe lists burrowing, staying underwater and freeze tolerance as common strategies among frogs. Purdue University Extension says the key for overwintering green frogs (Rana clamitans) is available oxygen, which they absorb through the skin.

A study of Cope’s gray treefrog (Dryophytes chrysoscelis) found that species can tolerate freezing by building up sugars and glycerol. That finding applies to the gray treefrog. The study does not cover the green tree frog, and nothing in the sources reviewed shows that green tree frogs can freeze.

Pet green tree frogs and cold

The Virginia Herpetological Society reports that captive green tree frogs become lethargic and move without coordination below 16 C (61 F). That is a sign of too much cold, and not a harmless rest.

Exo Terra’s care guide gives a day range of 23 to 27 C (73 to 80 F) and a night range of 18 to 21 C (65 to 70 F).

Its only winter advice is an optional cool period to trigger breeding: about 18 C (65 F) for 5 to 6 weeks, an 8-hour day and less feeding. This is a breeder’s technique. A pet owner without a breeding plan has no need to cool the frog.

What to do if you find one in winter

Leave a wild frog alone if it is sheltered and not in danger. Do not warm it up and bring it indoors, because it may be using the shelter on purpose. If it is in a place that will be disturbed, such as a bird house you plan to clean, wait until spring.

If you keep a pet frog that stops eating in winter, check temperature first. A tank that has become too cold is the likely cause. An exotics vet can advise if the frog stays inactive.

Related reading

To see where the species lives, read the green tree frog range guide. For size, see how big tree frogs get.

Frequently Asked Questions

Do green tree frogs hibernate in winter?

They often become inactive in cold months, especially in the north. Scientists usually call this brumation.

Where do green tree frogs go in winter?

Reported shelters include rock crevices and bird houses. Where most go is not well documented.

Can green tree frogs freeze and survive?

The sources reviewed do not show this. Cope’s gray treefrog can, but that is another species.

Should a pet green tree frog brumate?

Not unless you plan to breed. Exo Terra describes a cool period only as a breeding trigger.

What temperature makes a captive green tree frog sluggish?

The Virginia Herpetological Society says below about 16 C (61 F).

Are green tree frogs active in winter in Florida?

The sources reviewed do not give detail for southern winters. They only say frogs are more inactive in the north.

Bottom Line

Green tree frogs slow down in the cold, but the details of where and how they spend winter are still thin in the literature.

If you keep one, hold a steady, warm tank and skip the cool period unless you are breeding with expert advice.

Sources

• Green Treefrog, Virginia Herpetological Society, accessed 31 October 2026
• Dryophytes cinereus, USA National Phenology Network, accessed 31 October 2026
• Ask Dr. Universe: how frogs survive winter, Washington State University, accessed 31 October 2026
• Green frog overwintering, Purdue University Extension, accessed 31 October 2026
• Freezing tolerance in Cope’s gray treefrog, Journal of Comparative Physiology B, accessed 31 October 2026
• Hyla cinerea care guide, Exo Terra, accessed 31 October 2026