Snakes in Montana: identification guide and best places to start

Are there snakes in Montana?

Yes, snakes live throughout Montana, though they are far more common in the central and eastern prairie than in the cold high mountains. The state has roughly 10 native snake species. Nine are completely harmless to people, and one, the prairie rattlesnake, is venomous.

Snakes are cold-blooded, so they depend on outside warmth to move. In Montana that means they spend the long winter underground in dens called hibernacula, often shared with other snakes, then emerge as the ground warms in spring. You are most likely to see one between late April and early October. Western Montana, with its higher elevation and cooler, wetter climate, holds fewer snakes and almost no rattlesnakes. The dry, open country east of the Rocky Mountain front is where snakes are part of everyday outdoor life.

For a wider picture of what shares this habitat, see theMontana wildlife hub, and use theMontana snake guideto match a sighting to a likely species.

What snakes live in Montana? (types and species)

Montana has about 10 snake species. Here is a plain rundown of the ones you are most likely to meet, grouped by how common and how harmless they are.

Non-venomous snakes (the large majority):

Bullsnake (gopher snake): Montana's largest snake, often 4 to 6 feet. Tan or yellow with dark brown blotches. It hisses loudly and can vibrate its tail in dry grass, so it is the snake most often mistaken for a rattlesnake. It has no rattle and no fangs.

Common garter snake and terrestrial garter snake: Slim snakes with three light stripes running down a darker body. Common near water, gardens, and damp ground. Harmless.

Racer (yellow-bellied racer): Fast, slender, plain greenish or brown above with a pale yellow belly. Flees quickly when disturbed.

Gopher snake, hognose snake (the western hognose puts on a dramatic bluffing display, flattening its neck and hissing, but rarely bites), milk snake, smooth green snake, and rubber boa round out the harmless list. The rubber boa is a gentle, slow burrower found in moister western areas.

Venomous snakes:

Prairie rattlesnake: the only venomous snake in the state. See the section below on venomous species and thesnake facts pagefor field marks.

Use theMontana snake guideto narrow down a sighting by region and habitat.

What venomous snakes live in Montana?

Only one venomous snake lives in Montana: the prairie rattlesnake (Crotalus viridis). There are no copperheads, cottonmouths, or coral snakes in the state, so if a Montana snake is venomous, it is a prairie rattlesnake.

The prairie rattlesnake is a pit viper. Key marks are a broad, triangular head that is clearly wider than the neck, vertical cat-like pupils, and a segmented rattle at the end of the tail. Color is usually greenish-gray, olive, or light brown with a row of dark, oval blotches down the back. Adults commonly run 3 to 4 feet. Newborns are dangerous too and carry venom, but they have only a single small button instead of a full rattle, so do not rely on hearing a rattle to judge a young one.

Rattlesnakes are concentrated in the prairie, badlands, and river breaks of central and eastern Montana, such as the Missouri River breaks and the country around Ekalaka. They are scarce or absent in the cool, high western mountains. A rattlesnake will usually try to avoid you and rattles as a warning to be left alone. Give it room and it will move off. See thesnake facts pagefor a closer identification breakdown.

How can you identify common Montana snakes?

Start with three things: head shape, pattern, and tail.

Head shape: A rattlesnake has a wide, triangular, arrow-shaped head and a thin neck. Harmless snakes like bullsnakes and garter snakes have narrower heads that blend smoothly into the body. Pupils are hard to check safely and from a distance, so do not get close to look, but a rattlesnake has vertical pupils while non-venomous snakes have round ones.

Pattern and color: The prairie rattlesnake has dark oval blotches on a greenish-gray or tan body. The bullsnake is also blotched and similar in color, which is why people confuse the two, but it is longer and lacks a rattle. Garter snakes show three pale stripes. Racers are mostly one plain color. The smooth green snake is bright green.

Tail: A rattle is the surest sign of a rattlesnake. But remember a young rattlesnake may have only a tiny button, and a bullsnake or racer can buzz its tail tip against dry leaves to fake a rattle sound. So judge the whole animal, head plus pattern plus tail, not a single feature.

When in doubt, treat any snake you cannot confidently identify as if it could be venomous, keep your distance, and check thesnake facts pageor theMontana snake guideafterward.

Where are snakes most likely to be found in Montana?

Focus on warm, dry, open country with cover and prey. Rocky slopes, prairie dog towns, sagebrush flats, and the brushy edges along rivers and creeks all hold snakes. The Missouri River breaks and the badlands around Ekalaka in the southeast are well known rattlesnake areas. In the western part of the state, south-facing hillsides and open pine forest hold smaller numbers, and rattlesnakes thin out fast as elevation climbs.

Snakes pick spots that solve their daily temperature problem. In spring and fall you find them basking in the open on rock, gravel, south-facing banks, and trail edges during the warm middle of the day. In summer they shift to mornings and evenings and shelter from midday heat under rock ledges, logs, and dense grass. Rock outcrops near a den can concentrate many snakes in early spring.

For planning, use theMontana wildlife hubto pick a region, then theMontana snake guideto match habitat and season. If activity is slow, stay longer at one promising rocky, sunny spot rather than rushing between areas, and reset your timing around weather and light.

What is the best time of year to see snakes in Montana?

Snakes in Montana are most active from late April through early October. They emerge from winter dens as spring ground temperatures rise and return underground before hard fall frosts. Peak surface activity lines up with daytime air temperatures of roughly 70 to 90 degrees Fahrenheit.

Time of day matters as much as time of year. In the cooler weeks of spring and fall, snakes bask in the open during the warm midday hours, so late morning to mid-afternoon is best. In the heat of midsummer they avoid the hottest part of the day and move at the cooler edges, so early morning and the hours before dusk are better. Warm days that follow rain often bring more movement.

To line up season, weather, and place, use theMontana wildlife huband theMontana snake guide. A short, slow walk through good habitat at the right hour beats covering long distances at the wrong time.

Are snakes dangerous in Montana?

For most people, snakes in Montana are a very low risk. Nine of the state's roughly ten species cannot harm you at all. The single venomous species, the prairie rattlesnake, can deliver a serious bite, but bites are uncommon and deaths are very rare. Rattlesnakes do not chase people. They bite defensively, almost always when they are stepped on, cornered, or handled.

Most bites are avoidable. A large share happen when someone tries to catch, kill, or move a snake, so the simplest safety rule is to leave snakes alone. When you are in rattlesnake country, watch where you put your hands and feet, stay on open trails, step on logs and rocks rather than blindly over them, and keep dogs leashed since curious dogs are bitten more often than people.

If a rattlesnake bite does happen, treat it as a medical emergency. Keep the person calm and still, keep the bitten limb roughly level with the heart, remove rings and tight items before swelling starts, and get to a hospital or call emergency services right away. Do not cut the wound, do not try to suck out venom, and do not apply a tight tourniquet or ice. For everyday outings, basic awareness covered on theMontana snake guideis enough.

How can you spot snakes on trails or in your backyard?

On trails, scan ahead and to the sides during the warm hours when snakes bask. Look at the sunny edges of the path, flat rocks, gravel, logs, and the base of warm south-facing banks. Watch your footing on rocky stretches and step onto rocks and logs, not blindly over them, so you can see what is on the far side first. Move at a steady pace and you give snakes time to sense you and move off.

Around the yard, snakes look for cover, warmth, and rodents. Check before reaching into wood piles, rock gardens, dense flower beds, tall grass, and gaps under sheds, decks, and foundations. Keep grass trimmed, store firewood off the ground and away from doors, and control rodents, since a yard with mice and voles draws snakes that hunt them. Wear closed shoes when working in brushy areas.

If you hear a buzzing rattle, stop, find the snake with your eyes before you move, then back away slowly the way you came. Teach children to keep their distance and to tell an adult instead of approaching. For more on what lives nearby, see theMontana wildlife hub.

What should you do if you encounter a snake?

Stop and stay calm. Most snakes want to escape, not fight. Give the snake plenty of room, at least several feet and more for a rattlesnake, and never try to handle, poke, or move it. A large majority of bites happen when people try to kill or capture a snake, so doing nothing is usually the safest choice.

If it is a rattlesnake and it is rattling, that is a warning, not an attack. Locate it, then back away slowly and steadily until you are well past it, and take a wide path around. Do not turn the encounter into a standoff. If a snake is simply crossing a trail, wait and let it pass.

If you have a dog, keep it leashed and away from the snake, since dogs are bitten far more often than people because they investigate with their noses. For a snake in the yard that you want gone, the safest route is to leave it alone until it moves on, or contact local animal control or a wildlife professional rather than handling it yourself. Remember that killing native snakes is restricted in Montana, covered in the legal section below and on theMontana snake guide.

Are snakes protected in Montana?

Yes, native snakes have legal protections in Montana. Under the state's nongame wildlife rules, native reptiles, including all of Montana's snakes, are classified as nongame wildlife, and it is generally illegal to kill, collect, harass, or possess them without proper authorization. This protection covers harmless species and the prairie rattlesnake alike, because rattlesnakes are native wildlife with a role in controlling rodents.

What this means in practice for most people is simple: leave snakes where you find them. You should not catch wild snakes to keep as pets, sell them, or kill them on sight just for being snakes. There are limited, defined exceptions, such as acting to protect human safety in an immediate threat, and specific rules can change, so the responsible step is to check the current regulations published by Montana Fish, Wildlife and Parks before collecting or removing any snake.

The practical takeaway lines up with the safety advice on this page. Giving snakes space keeps you safe and keeps you within the law. For more on Montana species and how to enjoy them responsibly, see theMontana wildlife huband thesnake facts page.

How common are snake sightings in Montana?

Snake sightings in Montana are common in the right places and uncommon in the wrong ones. In the warm, dry prairie and river country of central and eastern Montana, residents regularly see bullsnakes, garter snakes, and rattlesnakes through the warm months. In the cooler, higher western mountains, snakes are much scarcer and rattlesnakes are rare to absent.

Sightings cluster by season and weather. They climb during warm, dry spells from late spring through early fall and around den emergence in spring, then fall off sharply once cold weather sets in and snakes move underground. Garter snakes turn up often in gardens and near water, while rattlesnakes are reported most from rocky breaks, prairie dog towns, and the Missouri River breaks.

So whether snakes feel common to you depends mostly on where you live and walk and the time of year. For region by region context, use theMontana wildlife huband match likely species on theMontana snake guide.

How can you learn more about Montana snakes?

Field guides and local herpetological societies are great resources. You can also support your curiosity with snake-themed apparel from oursnake t-shirt collection. Here are a few favorites:

Rattlesnake Graphic T-Shirt

A bold design featuring a classic rattlesnake silhouette. Perfect for wearing on your next hike.Check Price and Availability

Green Viper Snake T-Shirt

A vibrant green viper print that stands out in the field or at camp.Check Price and Availability

Snake T-Shirt

A simple, clean snake graphic that any snake fan will appreciate.Check Price and Availability

Retro Cute Snake T-Shirt

A strong match for this wildlife page and an easy next click after the guide.Check Price and Availability