When Do Snakes Come Out in Montana? Snake Season, Species, and Safety Tips

If you spend time hiking, camping, or working outdoors in Montana, knowing when snakes are active can make a real difference in how safely you navigate the landscape. Montana’s wide-open prairies, rocky coulees, river corridors, and forested foothills all provide habitat for the state’s native snake species — and each season brings its own level of activity.

The good news is that Montana is home to only 10 snake species, and just one of them poses a serious risk to humans. Understanding the seasonal rhythms of these reptiles helps you stay calm, prepared, and aware whenever you head outdoors.

Key Insight: Snakes are not aggressive by nature. Most bites happen when a person accidentally steps on a snake or attempts to handle one. Awareness and distance are your best tools.

When Snake Season Starts and Ends in Montana

Snakes in Montana come out in late March or early April and remain active until they go into hibernation — or brumation, a period of lesser activity not as deep as true hibernation — in the fall. The exact timing shifts from year to year depending on how quickly temperatures rise in spring and how early cold weather sets in during autumn.

Snakes in Montana are typically active from April through October, depending on elevation and annual weather patterns. Most species hibernate communally in underground dens known as hibernacula, often returning to the same sites year after year.

Montana’s snake species go into hibernation, or brumation, in the autumn, anytime from September to December. At higher elevations, the active season can be noticeably shorter, since temperatures drop earlier and stay cold longer than in the lower valleys and plains.

Snakes are ectotherms, meaning they regulate their body temperature by absorbing or giving off heat. Because their body temperature is affected by environmental temperatures and varies with surrounding conditions, snakes become inactive during very hot seasons (aestivation) and very cold seasons (hibernation).

Pro Tip: Snakes are generally not active when temperatures dip below 60°F. They also avoid overheating by seeking shade under rocks, bushes, or in a burrow on hot and/or sunny days.

Peak Snake Activity Months in Montana

Not all months within snake season carry the same level of activity. There are distinct windows when you are far more likely to encounter a snake — whether on a trail, near water, or around your property.

In spring (typically April to May), snakes emerge from their winter dens, often appearing sluggish as they warm their bodies after hibernation. Summer months (June through August) represent their most active period, when they are frequently encountered during dawn and dusk hours. By late September, they begin returning to their winter dens, with most snakes completely retreated by mid-October.

Most bites occur between April and September when snakes and humans are most active. This overlap — both people and snakes spending more time outdoors during these months — is why situational awareness matters most during late spring and throughout the summer.

Late spring and early fall see increased activity as snakes migrate between feeding areas and hibernation sites. During these transitional periods, you may notice snakes on the move more than usual, crossing roads, trails, and open ground as they seek food or suitable denning locations.

During the peak summer months, snakes are most active during cooler morning and evening hours, often seeking shade during the hottest parts of the day. On extremely hot days, you are more likely to encounter snakes in shaded spots, under rocks, or along shaded creek banks rather than out in the open.

Common Snake Species in Montana and Their Active Seasons

Montana’s diverse landscapes support a surprisingly rich snake population despite its northern location and colder climate. The state is home to 10 native snake species, ranging from the harmless garter snake to the venomous prairie rattlesnake. Here is a look at the most commonly encountered species and when you are likely to see them.

Garter Snakes (Three Species)

The most common snake in Montana is the garter snake, of which there are three species — the Common Garter Snake, Western Terrestrial, and Plains Garter Snake. People in Montana often see garter snakes in backyards and near water. These adaptable reptiles can be seen in grasslands, forests, and near water sources. Garter snakes are easily recognizable due to their distinctive coloration and patterns, which can range from stripes to spots in various hues, including green, brown, and yellow. They are non-venomous and harmless to humans. You can learn more about the different types of garter snakes found across North America.

Gopher Snake (Bullsnake)

Montana’s largest snake is the Bullsnake, or Gopher Snake. Adult Bullsnakes range from 3 to 5 feet, with some growing to 7 feet. These powerful constrictors feed on small mammals and are generally found in dry grassland and sagebrush habitat, though they have also been spotted in green grassy areas. They are active from late spring through early fall and are completely non-venomous, though their defensive hissing and tail-vibrating can make them seem threatening.

Northern Rubber Boa

Rubber boas are slow-moving, secretive, and mostly nocturnal. They occur primarily in western Montana forests and are known for feeding on small mammals, including nestling rodents. Their gentle nature makes them one of the least defensive snakes in the state. Because they burrow and prefer rocky areas with loose soil, sightings are uncommon even during their active season.

North American Racer

Racers emerge from hibernation in April to early May and begin mating shortly thereafter. Pregnant females lay eggs in burrows which hatch in August. Racers are found throughout Montana at elevations below 6,600 feet. The racer is an agile and very fast animal that can move at about 4 miles per hour when threatened.

Western Hognose Snake

The western hognose snake is one of Montana’s most distinctive-looking species, easily recognized by its upturned snout used for digging in sandy soils. It is relatively uncommon and primarily restricted to the southeastern part of the state. When threatened, this snake is known for exaggerated defensive displays, including flattening its neck, hissing, and even playing dead.

Western Milksnake

The Western Milk Snake is among Montana’s most strikingly beautiful serpents. With a vibrant pattern of red, black, and cream or yellow bands circling its body, the Milk Snake is sometimes mistaken for the venomous Coral Snake (which doesn’t live in Montana). In Montana, the milk snake is found in central and southeast portions of the state. For a deeper look at how to tell similar-looking species apart, see this guide on the difference between milk snakes and coral snakes.

Smooth Green Snake

The smooth green snake is found only in the upper northeast corner of Montana. Very little is known about its reproductive activity, but researchers believe the snake mates in May or June with young hatching in July or August. Green snakes feed on spiders, grasshoppers, and slugs. You can read more about green snakes in Montana for a closer look at this species.

Important Note: Though Montana only has one native venomous snake, non-venomous snakes often behave in ways that can deceive onlookers. For example, some will vibrate their tails as a defense behavior, which can sound similar to a rattlesnake. The hog-nosed snake will also flatten its head and rise into a strike pose in an attempt to look larger and more intimidating. This behavior can commonly cause them to be mistaken as venomous, while in reality it is an attempt to bluff their way out of danger.

Venomous Snakes in Montana and When to Watch For Them

Of the 10 snake species native to Montana, only the Prairie Rattlesnake (Crotalus viridis) is venomous. That distinction is important — it means that the vast majority of snakes you encounter in the state pose no danger to you. Still, understanding when and where the prairie rattlesnake is most active is a key part of safe outdoor recreation in Montana.

It is also worth noting the difference between venomous and poisonous — two terms that are often used interchangeably but have distinct meanings. You can explore that distinction further in this article on the difference between venomous and poisonous snakes.

Identification

Unique features that separate adult rattlesnakes from the other non-venomous snakes found in Montana are that they have a triangular head, a heat-sensing pit located between the nostril and the eye, and elliptical eyes. The Prairie Rattlesnake is also the only native snake in Montana with a rattle at the end of its tail. Prairie Rattlesnakes typically measure 3–5 feet long with olive-green to brown coloration and dark oval blotches along their backs.

Seasonal Activity

Rattlesnake season in Montana begins in late March or early April, depending on the weather any given year. This means that the rattlesnake has finished its brumating period for the year and is ready to come out and search for food again. Summer months (June through August) represent their most active period, when they are frequently encountered during dawn and dusk hours.

They typically hunt during dawn and dusk hours in warmer months, though they may become nocturnal during the hottest parts of summer. By late September, they begin returning to their winter dens, with most snakes completely retreated by mid-October.

Range and Behavior

The prairie rattlesnake’s range covers most of the eastern two-thirds of the state, where open grasslands, eroded badlands, rocky coulees, and river breaks provide suitable basking and denning sites. There is one spot in Montana where you won’t find these snakes: the northwestern corner of the state, in and near Glacier National Park.

When threatened, a rattlesnake’s first response is usually to remain motionless, relying on camouflage. If further disturbed, it will often vibrate its tail, creating the distinctive rattling sound as a warning. Striking is typically a last resort when the snake feels cornered or directly threatened.

Montana records fewer than five rattlesnake bites per year on average, and fatalities are extremely rare due to modern antivenom availability and rapid medical response. For broader context, you can also review the most venomous snakes in North America to understand how the prairie rattlesnake compares.

Common Mistake: Never attempt to handle, capture, or kill a rattlesnake — even a dead one. Never attempt to pick up a dead rattlesnake. Freshly killed snakes contort and shift and may strike, biting you and injecting venom.

Where Snakes Are Most Commonly Found in Montana

Montana’s varied terrain creates distinct snake habitats across the state. Knowing which environments attract snakes — and during what part of the season — helps you adjust your awareness accordingly.

Grasslands and Prairie

Snakes such as the Western Rattlesnake and Gopher Snake thrive in grassland and prairie habitats due to the abundance of prey and the availability of suitable shelter. The grasslands and prairies offer snakes ample opportunities for hunting and basking in the sun. These open landscapes are especially active during the peak summer months.

Rocky Outcrops and Talus Slopes

Rocky outcroppings, which provide both basking opportunities and quick retreat options, are particularly favored by many Montana snake species. Rattlesnakes are more likely to be encountered on south-facing slopes and in areas with rock outcrops. Den sites are often found in talus or rocky outcrops on south-facing slopes.

Rivers, Wetlands, and Water Sources

The plains garter snake is among the most widespread and frequently encountered snakes in Montana, particularly near wetlands, irrigation canals, streams, and riverbanks. Most human-snake encounters occur near water sources, rocky outcrops, hiking trails, and rural properties.

The Missouri River supports the highest concentration of snake activity in the state. Its slow currents, wide floodplains, and long shoreline provide conditions that snakes use throughout the active season.

Western Forests

In eastern Montana, snakes thrive in grasslands, sagebrush plains, and along riverbanks. The mountainous western regions support fewer snake species, though garter snakes and rubber boas can be found at surprising elevations. Rubber Boas and Gopher Snakes are commonly found in forested habitats, where they can utilize the cover and resources provided by the forest ecosystem.

Around Homes and Properties

Snakes enter buildings in search of cool, damp, dark areas, or places where rodents and insects abound. While rattlesnakes are widespread in Montana and found in a variety of environments, they may turn up around homes and yards in brushy areas and under wood piles. Keeping your yard clear of debris, wood piles, and tall grass reduces the likelihood of an unexpected encounter close to home.

Pro Tip: During the hot part of the day, snakes move to shaded areas, and on cool days they sun themselves in warm open areas. Snakes often seek out paved roads where they are attracted by the heat from the road surface. Use extra caution on paved paths and roads during cooler mornings.

What to Do If You Encounter a Snake in Montana

Encountering a snake on the trail or in your yard can be startling, but most situations are easy to handle calmly. The key is knowing what actions to take — and which to avoid entirely.

If You See a Snake Outdoors

• If you encounter a snake, maintain a safe distance (15–20 feet) and walk around.
• Give the snake time and space to move off the trail on its own — it is far more interested in escaping than in confronting you.
• If you see a Montana rattlesnake, back away slowly and calmly. Don’t hang around, don’t snap photos, and don’t approach the snake under any circumstances.
• Leash your dog when hiking in snake country. Dogs are at increased risk of being bitten while investigating the outdoors.

Prevention While Hiking

• Wear closed-toed shoes or boots that extend above the ankle. Loose-fitting, long pants with a tight weave can also provide a fair amount of protection against snake bites on the lower leg.
• Stick to designated trails and take particular care when nearing rock piles, logs, and long grass locations. Step onto rocks and logs instead of stepping over them.
• Stick to the trail and use care around rock piles, logs, and locations where vegetation types meet. Try to step on rocks and logs rather than over them, and do not insert hands, step, or sit where you cannot see or visually inspect the area first.

If You Are Bitten by a Rattlesnake

Rattlesnake bites are rare in Montana, but knowing how to respond is important. Remain calm and move slowly. Never run — increased exertion increases venom absorption. If possible, immobilize the area that has been bitten. Use a splint or sling and apply loose pressure without cutting off circulation.

Activate emergency services as soon as possible by dialing 911. Take off all restrictive items such as rings and watches, as venom occasionally causes swelling.

There are also several things you should never do after a snakebite:

• Do NOT attempt to capture the snake. Do NOT cut the wound with a knife or razor. Do NOT use your mouth or other equipment to “suck” out the venom. Do NOT apply a tourniquet. Do NOT pack the bite area in ice.

The potential of encountering a rattlesnake should not deter anyone from venturing outdoors. The chances of being bitten are extremely low compared to the risk of other outdoor injuries. Nationwide, only 5 to 6 people die each year from snake bites.

Key Insight: Snakes are an important part of the ecosystem. With a little common sense, you can get out and appreciate all the beauty that Montana has to offer without causing yourself or snakes any harm.

For a complete overview of all snake species living in the state, visit this full guide to types of snakes in Montana. You can also explore the most venomous snakes in the US to understand where Montana’s prairie rattlesnake fits in the broader national picture, or take a look at animals that eat snakes to learn more about the natural predators that help keep snake populations in balance.