Snakes are not active in winter in most of North America. Instead, they enter a state called brumation (the reptile equivalent of hibernation) from late fall through early spring.
During brumation, snakes retreat to underground dens called hibernacula, below the frost line. This guide covers what snakes do in winter and when they emerge.
Key Takeaways
- Snakes brumate, not hibernate, during winter. They enter a low-energy state below the frost line.
- Brumation dens (hibernacula) are typically underground burrows, rock crevices, or building foundations.
- Snakes may emerge on warm winter days to bask or drink water, especially in southern regions.
- In warm climates (Florida, Texas, California), snakes may be active year-round with reduced winter activity.
In This Guide
What Is Brumation?
Unlike mammals that hibernate, snakes enter brumation. This is a state of reduced metabolic activity where the snake's body temperature drops, its heart rate slows, and it requires very little energy.
The snake remains semi-aware and may drink water on warm days. Brumation is triggered by decreasing temperatures and shorter daylight hours. It typically begins in October-November and ends in March-April, depending on the climate.
Where Snakes Go in Winter
>- Underground burrows below the frost line, often using old rodent burrows
- Rock crevices and ledges that provide thermal mass and protection
- Building foundations and crawlspaces that maintain stable temperatures
- Compost piles that generate heat as they decompose
- Tree hollows in warmer regions
When Snakes Emerge
| Region | Brumation Period | Emergence Time |
|---|---|---|
| Northern US / Canada | October - April | Late April to May |
| Mid-Atlantic / Midwest | November - March | March to April |
| Southeast US | December - February | February to March |
| Southwest / Deep South | December - January (or none) | January or year-round activity |
| Florida / Texas / California | Minimal or no brumation | Active year-round with reduced winter activity |
For more, read our snake hole guide.
Frequently Asked Questions
Can snakes freeze to death in winter?
Yes. Snakes that cannot find shelter below the frost line can freeze to death. This is why hibernacula are so important. Snakes often share dens with other snakes to share body heat and reduce heat loss.
Do snakes come into houses in winter?
Yes. Snakes may enter homes, garages, and crawlspaces seeking warmth in winter. They are especially attracted to basements, crawlspaces, and areas near furnaces or water heaters. Sealing entry points in fall prevents this.
Do snakes hibernate together?
Many snake species share brumation dens (hibernacula) with other snakes, including other species. Garter snakes are famous for sharing dens with hundreds of individuals. This communal behavior helps conserve heat.
What month do snakes come out of hibernation?
Snakes emerge from brumation when temperatures consistently reach 60°F or higher. In northern regions, this is typically April to May. In southern regions, snakes may emerge as early as February. Males often emerge before females.
The Bottom Line
Snakes are not active in winter in most of North America. They enter brumation, a low-energy state similar to hibernation, in underground dens below the frost line.
Snakes may emerge on warm winter days and can enter homes seeking warmth. The best prevention is sealing entry points in fall before brumation begins. In warm climates like Florida, Texas, and California, snakes may remain active year-round with reduced activity during cooler months.
