Snakes in South Dakota: Identification Guide and Best Places to Start
Snakes do show up in South Dakota, and the best first step is matching habitat, timing, and recent local conditions. Start with the state wildlife hub, compare likely cover and movement windows, use the animal facts page for field marks, and plan one realistic route before heading out.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Bullsnake · Rory O'Shea CC BY
Prairie Rattlesnake · Public domain CC0
Plains Garter Snake · Public domain CC0
- 8
- species recorded
- 24
- GBIF records
- June, May, July
- peak months
Snakes are rare in South Dakota, so you might also want:
Verified species, source iNaturalist
12 types of snakes recorded in South Dakota
12 snake species have a verified observation record in South Dakota across snakes (suborder Serpentes), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
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Plus 3 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations. Photos by iNaturalist observers, reused under the licence each observer chose.
Real sighting data, source iNaturalist
2,181 verified observations on iNaturalist of snake have been recorded in South Dakota, most often in June, May, July.
When snake are recorded in South Dakota
Snakes do show up in South Dakota, and the best first step is matching habitat, timing, and recent local conditions. Start with the state wildlife hub, compare likely cover and movement windows, use the animal facts page for field marks, and plan one realistic route before heading out.
1. Where are people most likely to notice snakes in South Dakota?
Snakes in South Dakota are most often seen in the western part of the state, especially in Badlands National Park and the surrounding shortgrass prairies. Look along rocky slopes, prairie dog towns, and near water sources like the Cheyenne River. In the east, garter snakes and bullsnakes turn up in gardens and along wooded edges.
See ourstate wildlife pagefor the next step.
2. What seasons and weather patterns help with snake spotting?
Snakes are most active from late April through September. The best time to spot them is on warm mornings (70–85°F) when they bask on rocks or trails. After a rain, snakes often move across roads or trails. Early spring and fall offer lower vegetation, making them easier to see.
See ourSnakes guidefor the next step.
3. How can you tell a prairie rattlesnake from a bullsnake?
The prairie rattlesnake has a thick body, a triangular head, and a rattle on the tail. Its patterns are diamond-shaped blotches. The bullsnake is longer and thinner, with a pointed head, no rattle, and a blotched pattern that looks similar but has a dark line from the eye to the jaw. Bullsnakes often hiss and flatten their heads when threatened.
See ourstate animal guidefor the next step.
4. Which other snakes live in South Dakota?
Besides the prairie rattlesnake, common species include the plains garter snake, red-sided garter snake, bullsnake, eastern yellow-bellied racer, and the smooth green snake. The northern water snake is found in the eastern rivers. Most are harmless and help control rodents.
5. What should you do if you encounter a snake on the trail?
Stop and give it space. Most snakes will move away if you stay still. If it's a rattlesnake, step back slowly. Do not try to handle or prod it. Keep dogs on a leash in snake country. Learn to identify the venomous species before heading out.
6. How can you identify a venomous snake in South Dakota?
The only venomous snake in South Dakota is the prairie rattlesnake. Look for a rattle on the tail, a broad triangular head, and vertical pupils. It has a thick body and a heat-sensing pit between the eye and nostril. All other snakes in the state are non-venomous.
7. After a great day of snake spotting, show your interest with some gear
Once you've seen a few snakes, you might want to share the experience. Easy Street Markets has a selection of snake-themed shirts to mark the memory. For instance, theRattlesnake Graphic T-Shirtand theGreen Viper Snake T-Shirtare solid picks. You can browse all snake shirts on ourt-shirts pageto find your fit.
See ourCompare wildlife shirtsfor the next step.
Rattlesnake Graphic T-Shirt
A strong match for this wildlife page and an easy next click after the guide.Check Price and Availability
Green Viper Snake T-Shirt
A strong match for this wildlife page and an easy next click after the guide.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
8. Frequently asked questions about snakes in South Dakota
**Are there water moccasins in South Dakota?** No, they are not found in the state. The only venomous snake is the prairie rattlesnake.
**What time of year are baby snakes born?** Most snakes give birth in late summer. August is peak season for seeing young garter snakes and bullsnakes.
**How common are rattlesnake bites?** Bites are rare. Most happen when someone tries to handle or step on a snake. Stay aware and you'll be fine.
**Can I keep a snake I find?** It is illegal to collect native snakes without a permit. Leave them where you found them.
See ourtour planning ideasfor the next step.
Gear and field guides
Plan your trip
Best time to see snake in South Dakota: June, May, July
See the month-by-month sighting calendar.
Plan your snake sighting in South Dakota
24 verified snake records have been logged in South Dakota, most recently in 1932. See the GBIF records.
Where to look in South Dakota
- Badlands National Park · Wildlife Watching, Birdwatching · Find hotels
- Jewel Cave National Monument · Wildlife Watching, Birdwatching · Find hotels
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- Missouri National Recreational River · Wildlife Watching, Birdwatching · Find hotels
- Wind Cave National Park · Wildlife Watching, Birdwatching · Find hotels
- Minuteman Missile National Historic Site · Find hotels
Frequently asked questions
What snake species live in South Dakota?+
Snakes in South Dakota are most often seen in the western part of the state, especially in Badlands National Park and the surrounding shortgrass prairies. Look along rocky slopes, prairie dog towns, and near water sources like the Cheyenne River. In the east, garter snakes and bullsnakes turn up in gardens and along wooded edges. See ourstate wildlife pagefor the next step.
Where can you see snakes in South Dakota?+
Snakes in South Dakota are most often seen in the western part of the state, especially in Badlands National Park and the surrounding shortgrass prairies. Look along rocky slopes, prairie dog towns, and near water sources like the Cheyenne River. In the east, garter snakes and bullsnakes turn up in gardens and along wooded edges. See ourstate wildlife pagefor the next step.
When is the best time to see snakes in South Dakota?+
Snakes in South Dakota are most often seen in the western part of the state, especially in Badlands National Park and the surrounding shortgrass prairies. Look along rocky slopes, prairie dog towns, and near water sources like the Cheyenne River. In the east, garter snakes and bullsnakes turn up in gardens and along wooded edges. See ourstate wildlife pagefor the next step.
Keep exploring
More places to see snake
More wildlife in South Dakota