Best Time to See Rattlesnakes in Wyoming
June, July and May is the best time to see rattlesnakes in Wyoming. Based on 388 verified iNaturalist observations, here is exactly when rattlesnakes are most active across the year in Wyoming.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Eastern Diamondback Rattlesnake · Scott Allen Davis CC BY
Panamint Rattlesnake · Matt Berger CC BY
Red Diamond Rattlesnake · Amy Huie CC BY
388 verified observations of rattlesnakes in Wyoming, recorded across 9 months of the year on iNaturalist.
When rattlesnakes are recorded in Wyoming
Peak month
June
120 records (30.9% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 1 | 0.3% |
| April | 5 | 1.3% |
| Maypeak | 67 | 17.3% |
| Junepeak | 120 | 30.9% |
| Julypeak | 92 | 23.7% |
| August | 53 | 13.7% |
| September | 36 | 9.3% |
| October | 13 | 3.4% |
| November | 1 | 0.3% |
| December | 0 | 0% |
Rattlesnakes you are most likely to see
| Species | Verified observations |
|---|---|
| Prairie Rattlesnake | 364 |
| Western Rattlesnake | 24 |
Weather to expect, source Open-Meteo
Typical weather in Wyoming
Recent typical conditions by month, so you can plan a trip around both when rattlesnakes are active and what the weather is doing. The best months to look for rattlesnakes sit around 40 to 84 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 27°F | 15°F | 0.9" |
| Feb | 25°F | 9°F | 0.7" |
| Mar | 35°F | 19°F | 1.6" |
| Apr | 45°F | 26°F | 1.9" |
| Maybest time | 60°F | 40°F | 2.3" |
| Junbest time | 74°F | 52°F | 1.7" |
| Julbest time | 84°F | 60°F | 0.3" |
| Aug | 82°F | 58°F | 0.9" |
| Sep | 72°F | 50°F | 0.8" |
| Oct | 51°F | 33°F | 1.9" |
| Nov | 40°F | 24°F | 0.7" |
| Dec | 30°F | 17°F | 0.5" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Wyoming. Weather varies year to year, so treat these as a guide.
Sightings of rattlesnakes in Wyoming peak in June, when 120 of the year's 388 verified observations are logged — about 30.9% of the annual total. Activity stays high through June, July and May.
The quietest stretch is January, February and December, when rattlesnakes are hardest to find — no verified records exist for January. If a reliable sighting matters, plan around the peak window rather than the off-season.
The rattlesnakes you are most likely to encounter in Wyoming are Prairie Rattlesnake and Western Rattlesnake — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see rattlesnakes in Wyoming
- Bighorn Canyon National Recreation Area — National Recreation Area
- Devils Tower National Monument — National Monument
- Fossil Butte National Monument — National Monument
- Grand Teton National Park — National Park
- Yellowstone National Park — National Park
- California National Historic Trail — National Historic Trail
Frequently asked questions
What is the best month to see rattlesnakes in Wyoming?+
June is the single best month, and the broader peak window runs through June, July and May, based on 388 verified iNaturalist observations.
When are rattlesnakes hardest to see in Wyoming?+
January is the quietest month for rattlesnakes in Wyoming, with no verified records on iNaturalist.
Are rattlesnakes active year-round in Wyoming?+
Rattlesnakes are recorded in 9 of 12 months in Wyoming, concentrated around June and July.
More places to see rattlesnakes
More wildlife in Wyoming