Venomous Snakes in Montana: The Prairie Rattlesnake
Montana’s only venomous snake is the prairie rattlesnake (Crotalus viridis), found primarily in the eastern two-thirds of the state, from the Missouri River breaks to the badlands. These rattlesnakes inhabit rocky outcrops, prairie dog towns, and river valleys. They are most active during warm daylight hours in spring and fall, and become nocturnal in summer heat. Adult rattlesnakes average 3-4 feet in length and have a distinctive rattle on the tail. Bites are rare but serious; symptoms include pain, swelling, and tissue damage. According to the Montana Department of Fish, Wildlife & Parks, antivenom is available at most hospitals. If bitten, remain calm, immobilize the affected limb, and seek emergency medical care immediately. Do not cut the wound or attempt to suck out venom.
Legal Status and Ethical Considerations
In Montana, snakes are classified as nongame wildlife, meaning they are protected by law. The Montana Fish, Wildlife & Parks Commission prohibits the killing of snakes unless they pose an immediate threat to human safety. Even then, relocation is preferred. Non-venomous species like bullsnakes, garter snakes, and racers are beneficial for controlling rodents and insects. Killing them can disrupt the local ecosystem and may result in fines. Professional removal services follow state guidelines, often relocating snakes to suitable habitats away from human dwellings. Homeowners should always consult with a licensed professional before taking action.
Seasonal Behavior and Denning Sites
Snakes in Montana hibernate during winter in dens called hibernacula, often shared by multiple species. These dens are typically located in rocky crevices, animal burrows, or building foundations. In spring (April-May), snakes emerge and migrate to summer feeding areas. Fall (September-October) sees a return to dens. During these transition periods, snakes are more likely to encounter humans as they cross roads or yards. Understanding this pattern helps homeowners anticipate activity. Exclusion work is best done in early spring before emergence or in late fall after snakes have denned, to avoid trapping animals inside.
Common Non-Venomous Snakes in Montana
Montana is home to several harmless snakes that are often mistaken for rattlesnakes. The bullsnake (Pituophis catenifer) is large (up to 6 feet), has a blotched pattern, and can hiss loudly and vibrate its tail—mimicking a rattlesnake. Garter snakes (Thamnophis spp.) are smaller, with stripes, and are common near water. The plains hognose snake (Heterodon nasicus) has an upturned snout and plays dead when threatened. Learning to identify these species can reduce unnecessary fear and prevent harm to beneficial wildlife. Bullsnakes, in particular, are excellent rodent predators and should be left alone if possible.
Snake problems by the numbers
Before you compare providers, it helps to know what independent surveys and published cost guides actually report about snake problems in U.S. homes. None of the figures below come from this site's own customers; each carries its source, date and population so you can weigh it yourself. In Puri and colleagues' 2022 survey of 1,006 residents of one southeastern U.S. metro area, published in 2024, only 4.7% of those with snakes nearby preferred a small increase, a preference figure limited to people who reported snakes and not an infestation rate. If you are budgeting for a snake in the house, Fixr's January 2025 U.S. publisher estimate of $350 for a typical removal is a reasonable starting point, but it is a benchmark, not a bill; real prices depend on the snake, room and provider. Roughly one in four, 25.8%, of residents who reported snakes nearby wanted their numbers left alone, in Puri and colleagues' 2022 survey of 1,006 people in a southeastern U.S. metro area (published 2024), a neighborhood-opinion figure, not a measure of snakes in homes. About $500 is Fixr's January 2025 U.S. estimate for rattlesnake removal, a publisher benchmark for a venomous species and not an observed customer bill or a current quote for any specific area. Hiring a professional is a mainstream choice rather than a last resort: 42% of U.S. homeowners in Forbes Home's 2024 survey of 1,000 people said they had paid for pest control, though that is self-reported and does not show how much they spent. If one number should shape your next step, it is how often do-it-yourself attempts fall short. That is not an argument against trying, but it is a reason to set a deadline and call a professional if the problem persists past it.