Snakes in Colorado: identification guide and best places to start

1. Where are you most likely to notice snakes in Colorado?

Snakes in Colorado are most often seen in open grasslands, rocky canyons, and near water sources. Prairie rattlesnakes favor the shortgrass prairies east of the Rockies, while bullsnakes and garter snakes hang around river valleys and irrigation ditches. In the foothills, look for them basking on south-facing rocks or crossing trails on warm afternoons. For a deeper dive into Colorado wildlife habitats, check out ourColorado wildlife guide.

2. What seasons and weather patterns increase snake activity?

Spring (April to May) and fall (September to October) are the prime windows for snake spotting in Colorado. Snakes are ectothermic, so they emerge on days when temperatures reach 60-85°F. After a cold night, they often bask on rocks or pavement to warm up. Overcast days with light rain can also push them onto trails to hunt. Avoid the heat of summer midday when they retreat underground.

3. What are simple ID cues to tell Colorado snakes apart?

Start with head shape: rattlesnakes have a distinct triangular head with heat pits between the nostril and eye. Bullsnakes have a more rounded head but flatten it when threatened, mimicking rattlers. Garter snakes are slender with three light stripes running the length of their body. Color patterns also help: prairie rattlesnakes are tan with dark blotches, while bullsnakes are yellowish with darker saddles. Learn more about snake identification on oursnake species hub.

See ourstate animal guidefor the next step.

4. Which snake species are common in Colorado and where do they live?

The prairie rattlesnake (Crotalus viridis) is the most widespread venomous snake, covering the eastern plains and foothills up to about 8,000 feet. The bullsnake (Pituophis catenifer) is a large nonvenomous constrictor found in grasslands and farmlands across the state. The common garter snake (Thamnophis sirtalis) prefers wet areas along streams and ponds throughout Colorado. The plains hognose snake (Heterodon nasicus) is a rarer treat on sandy soils of the southeast.

5. How can you stay safe while snake spotting in Colorado?

Watch where you step and never reach into areas you can't see, like rock crevices or tall grass. Wear sturdy boots and long pants on trails. If you encounter a snake, stop and give it space; most bites happen when people try to handle or kill them. Keep dogs on a leash and away from suspicious rustling. In unlikely case of a bite, stay calm, immobilize the area, and get to a hospital immediately.

6. What are the best trails and locations for snake spotting?

Rocky Mountain Arsenal National Wildlife Refuge near Denver has excellent prairie rattlesnake sightings on its shortgrass prairie trails. Barr Lake State Park offers garter snakes along the lake edge. Garden of the Gods in Colorado Springs is good for basking bullsnakes on warm rock faces. For a more remote experience, try the Pawnee Buttes in the northeast where rattlesnakes are common on the trails.

7. Useful gear for snake spotting and identification

A field guide specific to Colorado reptiles, a pair of binoculars for safe viewing, and a camera with a zoom lens are all helpful. But if you want to show your love for snakes on your next outing, try one of these shirts.

### Rattlesnake Graphic T-Shirt

A realistic rattlesnake print that fits right in with a hike through the plains.Check Price and Availability

### Green Viper Snake T-Shirt

A bold green viper design for herpetology fans who prefer a little color.Check Price and Availability

### Retro Cute Snake T-Shirt

A playful retro snake that works for casual wear or as a conversation starter on the trail.Check Price and Availability

Check out more snake-themed apparel at ourt-shirts collection.

8. Frequently asked questions about snakes in Colorado

**Are there venomous snakes in Colorado?** Yes, the prairie rattlesnake, western rattlesnake, and midget faded rattlesnake are the venomous species. The massasauga rattlesnake is extremely rare.

**What time of day are snakes most active?** Snakes are most active during early morning and late afternoon when temperatures are moderate. On hot days they may be nocturnal.

**Do snakes in Colorado hibernate?** Yes, they brumate (a reptile form of hibernation) from October to March in communal dens, often in rock crevices or rodent burrows.

**How can I attract snakes to my yard?** If you want to see snakes, provide rock piles, logs, and a water source. Keep in mind that venomous snakes may also come, so it's safer to observe in natural areas.

**What should I do if I find a snake in my yard?** Give it space. Most snakes move on within a day. If it's venomous and poses a threat, contact a professional wildlife relocator.

See ourtour planning ideasfor the next step.