Usually, turtles avoid freezing solid, even when a pond’s surface freezes. Many freshwater turtles spend winter in liquid water beneath the ice, where their metabolism slows dramatically. Terrestrial turtles may instead burrow into soil or sand, and some hatchlings remain in their natal nests. A few species and life stages can tolerate limited ice formation or subfreezing exposure, but that is a specialized adaptation—not a rule for turtles generally.
The crucial distinction is between a frozen habitat and a frozen animal. Ice on top of a pond does not mean the water below, or the turtle resting there, has frozen. Whether a turtle can survive winter depends on its species, life stage, habitat, oxygen supply and the exact meaning of “freezing.”
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How turtles survive winter without freezing solid
Turtles are ectotherms: their body temperature and activity are strongly influenced by their surroundings. In winter, many species enter brumation, a low-activity state comparable to hibernation in its seasonal purpose but physiologically different. Body processes slow, movement nearly stops and energy and oxygen demands fall.
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For aquatic turtles, the safest winter location is often the bottom of a pond, lake or slow creek that does not freeze all the way through. Ice is less dense than liquid water, so a surface layer can freeze while deeper water remains just above 0 °C (32 °F). A turtle beneath that ice is cold and inactive, but its tissues are not necessarily frozen. Wyoming Game and Fish describes local aquatic turtles overwintering in ponds that remain liquid below the ice; Wendy Estes-Zumpf explains that they shelter where temperatures stay just above freezing and “essentially hibernate.” The agency’s explanation is specific to Wyoming fauna, not a universal rule for every turtle.
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Brumation reduces the oxygen problem
Cold water contains little available oxygen, and a turtle that is almost motionless still has to obtain enough for basic metabolism. Physiological reviews describe northern freshwater turtles using metabolic depression and adaptations to hypoxia (low oxygen) or, in some circumstances, anoxia (no measurable oxygen) to endure winter. Some aquatic turtles can exchange gases through highly vascularized tissues, including areas of the mouth and cloacal region, while submerged. The exact contribution of those tissues and the length of anoxia a turtle can survive vary by species. A review of hypoxic-turtle physiology emphasizes that cold, oxygen-poor water is not the same thing as the turtle’s body freezing.
Water chemistry still matters
Ice cover can prevent oxygen from entering water and can make winter sites dangerous if decomposition and poor circulation consume the available supply. The eastern musk turtle management plan says this species needs ice-covered water to remain oxygenated and can survive anoxic water for about three weeks, under the conditions described in its cited evidence. That figure applies to eastern musk turtles under the conditions studied; it is not a safe limit for all turtles or for an entire winter. Environment and Climate Change Canada’s 2024 plan provides the species-specific context.
Where turtles spend winter
“Do turtles spend winter on land or underwater?” has no single answer. Habitat is one of the fastest ways to distinguish winter strategies.
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| Winter strategy | Typical examples | What the turtle is avoiding or tolerating | Evidence and limits |
|---|---|---|---|
| Underwater brumation | Many northern freshwater turtles | They remain in liquid water beneath surface ice, with greatly reduced metabolism and oxygen demand. | Supported by regional agency accounts and physiological reviews; behavior and oxygen tolerance differ by species. |
| Burrowing on land | Woodland box turtles and other terrestrial turtles | Soil or sand provides an insulated chamber below the most severe surface cold. | National Park Service summary for woodland box turtles; depth, moisture and cold tolerance are species-specific. |
| Overwintering in a nest | Hatchling northern map turtles | Hatchlings remain in the natal nest until spring rather than entering a pond immediately. | Study from northern Indiana; laboratory results do not show that the hatchlings can freeze solid. |
| Limited freeze tolerance or supercooling | Some box turtles and particular hatchlings | Body fluids may remain unfrozen below 0 °C, or limited ice formation may be tolerated. | A life-stage- and species-specific exception, not a general turtle ability. |
| Under-ice survival in an unusual case | One adult eastern long-necked turtle in Australia | It survived a period when the surface of its creek pool was completely frozen. | A single-animal field observation; it does not prove that the turtle’s body froze or that all Australian turtles can do this. |
How terrestrial turtles get through winter
Burrows and overwintering chambers
Land turtles cannot rely on unfrozen pond water, so they seek a stable microclimate underground. Woodland box turtles may dig into soil or sand before the ground freezes, creating an overwintering chamber insulated from rapid air-temperature changes. The National Park Service describes this behavior and summarizes evidence that a substantial amount of a box turtle’s body water—up to 58 percent in the agency’s spotlight—can freeze without long-term ill effects. That percentage is a broad agency summary for box turtles, not a measurement to apply to aquatic turtles, hatchlings or an unidentified pet. Read the National Park Service species account for its qualification.
Hatchlings may stay in their birth nests
Some young turtles use the nest itself as a winter shelter. A study of northern map turtle (Graptemys geographica) hatchlings in northern Indiana documented hatchlings overwintering in natal nests and emerging after warmer weather returned. In laboratory tests, hatchlings were intolerant of direct freezing at −2.5 °C (27.5 °F) for 24 hours. The published study discusses supercooling—the ability of body fluids to remain liquid below their normal freezing point—and resistance to ice spreading into tissues as likely contributors to survival in the nest. The experiment therefore shows a narrow tolerance profile, not proof that these hatchlings can be frozen solid and revived. The published map-turtle study gives the experimental details.
Can any turtles survive actual freezing?
Some can tolerate conditions that would kill a typical turtle, but “freeze tolerance” covers several different phenomena. A turtle may supercool while its body fluids remain liquid below 0 °C; it may endure ice forming in limited extracellular spaces; or it may survive brief subfreezing exposure without its entire body becoming solid. Those mechanisms are not interchangeable with complete freezing of all tissues.
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The strongest safe conclusion is that freeze tolerance is limited, unevenly distributed and often dependent on life stage. A result from a box turtle, a hatchling or one population cannot be generalized to every turtle. A physiology review notes that many northern freshwater turtles generally cannot tolerate freezing and therefore overwinter underwater instead. Conversely, terrestrial species and some hatchlings have adaptations that permit them to remain in cold soil or nests.
The Australian turtle that survived a frozen pool surface
A 2024 field report provides a memorable but carefully bounded exception. The 2024 field report tracked an adult female eastern long-necked turtle (Chelodina longicollis) in Australia. The turtle remained in one creek pool during a seven-month tracked brumation period. For 15 days, the pool’s surface was totally frozen; after thaw, the turtle was recaptured alive. The study in Ecology and Evolution calls this the first observation of brumation under ice for an Australian chelid species.
That observation establishes that this individual survived those surface conditions. It does not establish that the turtle’s tissues froze solid, that the entire water column was frozen, or that eastern long-necked turtles—or turtles generally—can be placed in frozen water safely. The authors describe the observation as novel and say further research is needed to determine cold tolerance in pleurodiran turtles. Geography matters: an Australian creek pool, a Wyoming pond and a Canadian musk-turtle wetland represent different species and climates.
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What “freezing” can mean
Readers often use one word for several different conditions. Keeping them separate prevents the most common misunderstanding.
- Frozen surface: Ice covers the top of a pond, while deeper water remains liquid. A turtle beneath the ice may be brumating, not frozen.
- Subfreezing air or soil: The surrounding air or ground is below 0 °C, but the turtle’s body remains above its tissue-freezing point.
- Supercooling: Body fluids stay liquid below 0 °C without ice crystals forming.
- Limited ice formation: Some species or life stages can survive ice in particular body compartments or extracellular fluid.
- Complete tissue freezing: Ice forms throughout the body. Evidence for this is far rarer and cannot be inferred from a frozen pond surface or an inactive turtle.
Because these conditions have different biological consequences, there is no single minimum temperature that is safe—or lethal—for “turtles.” Water temperature, exposure time, oxygen, humidity, body size, species and life stage all change the outcome.
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Why an inactive turtle should not be taken home
A cold turtle may appear dead, especially when it is brumating underwater or buried in soil. That does not make it abandoned or suitable as a pet. Connecticut’s wildlife guidance explicitly advises people not to collect wild hatchlings as pets. Moving a turtle can expose it to rapid temperature change, dehydration, injury and disease, while removing it from the exact winter site its species selected. Connecticut DEEP’s winter-turtle guidance explains the conservation concern.
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If you encounter a wild turtle, leave it where it is unless it is in immediate danger, such as a roadway. Follow local wildlife-authority instructions for moving an animal a short distance out of traffic, and contact a licensed wildlife rehabilitator if the turtle is visibly injured. Do not dig up nests or collect hatchlings simply because they are motionless.
What this means for pet turtles
Wild overwintering facts are not a captive-care recipe. A pet turtle’s safe winter routine depends on its species, origin, health, enclosure, lighting, diet and veterinary history. Some captive turtles should never be encouraged to brumate; others may require a carefully controlled seasonal cycle under professional supervision. The sources summarized here do not establish a safe household temperature, water depth, oxygen level or brumation schedule.
Before changing a captive turtle’s temperature or feeding pattern, obtain species-specific instructions from an experienced reptile veterinarian. A turtle that is lethargic, floating abnormally, unable to submerge, wheezing or showing eye, shell or limb problems needs veterinary assessment rather than an improvised winter setup.
The practical answer
Most turtles survive winter by avoiding the point at which their bodies freeze: aquatic species use liquid water below surface ice, while terrestrial species use burrows or nests. Brumation lowers their energy and oxygen needs, and some species can tolerate low oxygen or limited subfreezing exposure. A few documented exceptions—including one Australian turtle that survived 15 days beneath a frozen pool surface—show how specialized these adaptations can be, not that turtles generally freeze and thaw like ice-resistant insects.
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