Are There Rattlesnakes in South Dakota?
Yes, rattlesnakes live in western South Dakota, particularly in the semi-arid regions of the Black Hills and surrounding prairies. Two species are found in the state: the prairie rattlesnake, which is widespread, and the western diamondback in the most arid southwestern portions. They are venomous but shy and generally avoid humans.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 21, 2026.
Eastern Diamondback Rattlesnake 路 Scott Allen Davis CC BY
Panamint Rattlesnake 路 Matt Berger CC BY
Red Diamond Rattlesnake 路 Amy Huie CC BY
- 1
- species recorded
- July, June, August
- peak months
Real sighting data, source iNaturalist
311 verified observations on iNaturalist of rattlesnake have been recorded in South Dakota, most often in July, June, August.
When rattlesnake are recorded in South Dakota
Yes, rattlesnakes live in western South Dakota, particularly in the semi-arid regions of the Black Hills and surrounding prairies. Two species are found in the state: the prairie rattlesnake, which is widespread, and the western diamondback in the most arid southwestern portions. They are venomous but shy and generally avoid humans.
Are Rattlesnakes in South Dakota?
Yes, rattlesnakes are established in western South Dakota, primarily in the semi-arid regions west of the Missouri River. The prairie rattlesnake is found throughout western South Dakota, particularly in grasslands, badlands, and around the Black Hills region. The western diamondback rattlesnake is found in the most arid southwestern portion of the state, particularly in areas around the Black Hills and the badlands. Rattlesnakes are not found in the more humid eastern portions of South Dakota, where the climate is too wet for these species. They are not present in the central corn belt region of the state. Western South Dakota residents and visitors should be aware of rattlesnakes in their area. For detailed information onRattlesnake in South Dakota, consult this guide to identify which species you might encounter when outdoors.
How Dangerous Is a Rattlesnake?
Rattlesnake bites in South Dakota are medical emergencies requiring immediate care, but they are rarely fatal. Fewer than 1 percent of rattlesnake bites in North America result in death. The venom causes severe pain, swelling, and tissue damage at the bite site and requires professional medical treatment. Systemic effects such as difficulty breathing or cardiovascular changes can occur in serious bites and indicate urgent need for emergency care. Venom is designed by evolution to immobilize small prey animals, not large creatures. Dry bites, where little or no venom is delivered, occur in a significant percentage of defensive bites as the snake conserves venom. Most people bitten in South Dakota survive with appropriate medical care and antivenom. However, even successfully treated bites can result in permanent tissue damage or functional impairment. Children and elderly people have higher risk from bites than healthy adults.
How to Recognize a Rattlesnake
South Dakota's rattlesnakes are distinctive and relatively easy to identify. Prairie rattlesnakes typically range from 3 to 4 feet long, with a tan or gray background and dark brown blotches or bands running down the back. Western diamondbacks are larger, sometimes exceeding 5 feet, with diamond-shaped blotches and distinctive black and white bands on the tail. Both species have the characteristic segmented rattle at the tail tip that buzzes when vibrated. All rattlesnakes have a triangular head distinctly wider than the neck. They have vertical pupils in their eyes. The rattle is the most distinctive feature but may be broken or worn in some individuals. Make noise while hiking so you hear the distinctive buzzing sound, which provides the best early warning of a snake's presence. You might encounter them inwildlifehabitats and natural areas.
What to Do If Bitten
If bitten by a rattlesnake in South Dakota, stay calm and seek medical care as quickly as possible. Remove any jewelry or tight clothing from the affected limb to prevent restriction as swelling develops. Keep the bitten area still and immobilized, and if possible, keep it below heart level. Do not attempt field treatment such as cutting, sucking, applying tourniquets, or ice. Do not apply heat or rub the bite. Walk calmly to your vehicle or arrange for someone to drive you to the nearest hospital emergency room. If you are far from help, call 911 or search and rescue. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Antivenom is the primary treatment and is most effective when administered within the first few hours after a bite.
How to Prevent Encounters
Prevention is the best strategy for avoiding rattlesnake encounters in western South Dakota. When hiking or camping in rattlesnake country, wear closed-toe boots that cover the ankle and consider snake gaiters for additional protection in high-risk areas. Stay on marked trails and avoid reaching into areas you cannot see, such as between rocks or into brush piles. Make noise while hiking so snakes hear you coming and can move away. Do not hike at night or at dawn and dusk when snakes are most active. Keep your campsite clean and free of food scraps that might attract rodents, which are the snakes' primary prey. Clear brush and debris from around any buildings or structures. Seal cracks and gaps in foundations and around doors. Remove or properly store firewood piles away from structures. Snakes naturally want to avoid humans and will escape if given the opportunity.
Where in South Dakota and When
Rattlesnakes in South Dakota are found only in the western portion of the state, west of the Missouri River. They are particularly common in the Black Hills region, the badlands, and the surrounding grasslands and semi-arid prairies. The prairie rattlesnake has a broader range across western South Dakota, while the western diamondback is more restricted to the driest southwestern areas. Rattlesnakes in South Dakota are active from April through October, with peak activity during late spring through early fall. They are most active during the warmest parts of the day, typically from late morning through early evening. During winter, they retreat to hibernacula or sheltered locations. They are virtually never encountered during the cold months.Wildlife in South Dakotaincludes many species; rattlesnakes are primarily a concern in the western regions of the state.
Harmless Lookalikes
Many snakes in South Dakota are mistaken for rattlesnakes, but the majority are completely harmless. The bullsnake or gopher snake has a blotched pattern and will vibrate its tail defensively, resembling a rattlesnake. However, it lacks the segmented rattle and has a smaller, pointed head. The prairie kingsnake has dark bands and a stocky body but lacks the characteristic rattle. The rat snake and racer snakes are common in western South Dakota and have simple coloring without obvious blotches. The speckled kingsnake has a speckled pattern and is harmless. Garter snakes are common throughout the state and have longitudinal stripes. If you see a snake with obvious diamond or blotched markings and a distinctive buzzing rattle at the tail, it is a rattlesnake. Most snakes people encounter are beneficial to the ecosystem.More on Rattlesnake in South Dakotawill help you identify them correctly.
Frequently Asked Questions
Are rattlesnakes deadly? Rattlesnakes are venomous and bites are serious, but deaths are extremely rare, especially with prompt medical care. How common are rattlesnake bites in South Dakota? Bites are uncommon in South Dakota; most residents and visitors encounter snakes only occasionally, if at all. What attracts rattlesnakes to an area? Rattlesnakes are attracted to rodents, their primary prey, and to rocky or brushy habitats where they can hide and hunt. What should I do if I see one? Move away slowly and give the snake plenty of space to escape. Do not try to capture or kill it.South Dakota wildlife guideprovides additional safety information for all wildlife in the state.
Plan your trip
Best time to see rattlesnake in South Dakota: July, June, August
See the month-by-month sighting calendar.
Frequently asked questions
Are Rattlesnakes in South Dakota?+
Yes, rattlesnakes are established in western South Dakota, primarily in the semi-arid regions west of the Missouri River. The prairie rattlesnake is found throughout western South Dakota, particularly in grasslands, badlands, and around the Black Hills region. The western diamondback rattlesnake is found in the most arid southwestern portion of the state, particularly in areas around the Black Hills and the badlands. Rattlesnakes are not found in the more humid eastern portions of South Dakota, where the climate is too wet for these species. They are not present in the central corn belt region of the state. Western South Dakota residents and visitors should be aware of rattlesnakes in their area. For detailed information onRattlesnake in South Dakota, consult this guide to identify which species you might encounter when outdoors.
How Dangerous Is a Rattlesnake?+
Rattlesnake bites in South Dakota are medical emergencies requiring immediate care, but they are rarely fatal. Fewer than 1 percent of rattlesnake bites in North America result in death. The venom causes severe pain, swelling, and tissue damage at the bite site and requires professional medical treatment. Systemic effects such as difficulty breathing or cardiovascular changes can occur in serious bites and indicate urgent need for emergency care. Venom is designed by evolution to immobilize small prey animals, not large creatures. Dry bites, where little or no venom is delivered, occur in a significant percentage of defensive bites as the snake conserves venom. Most people bitten in South Dakota survive with appropriate medical care and antivenom. However, even successfully treated bites can result in permanent tissue damage or functional impairment. Children and elderly people have higher risk from bites than healthy adults.
More wildlife in South Dakota