Best Time to See Rattlesnakes in Montana
June, July and May is the best time to see rattlesnakes in Montana. Based on 450 verified iNaturalist observations, here is exactly when rattlesnakes are most active across the year in Montana.
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
450 verified observations of rattlesnakes in Montana, recorded across 11 months of the year on iNaturalist.
When rattlesnakes are recorded in Montana
Peak month
June
123 records (27.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 1 | 0.2% |
| February | 1 | 0.2% |
| March | 1 | 0.2% |
| April | 13 | 2.9% |
| Maypeak | 68 | 15.1% |
| Junepeak | 123 | 27.3% |
| Julypeak | 119 | 26.4% |
| August | 68 | 15.1% |
| September | 40 | 8.9% |
| October | 15 | 3.3% |
| November | 0 | 0% |
| December | 1 | 0.2% |
Rattlesnakes you are most likely to see
| Species | Verified observations |
|---|---|
| Prairie Rattlesnake | 449 |
| Western Rattlesnake | 1 |
Weather to expect, source Open-Meteo
Typical weather in Montana
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 36 to 75 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 29°F | 17°F | 1" |
| Feb | 22°F | 9°F | 1.5" |
| Mar | 33°F | 18°F | 1.1" |
| Apr | 40°F | 24°F | 2.3" |
| Maybest time | 53°F | 36°F | 3.5" |
| Junbest time | 65°F | 47°F | 3.2" |
| Julbest time | 75°F | 55°F | 2" |
| Aug | 74°F | 54°F | 1.7" |
| Sep | 65°F | 46°F | 2.1" |
| Oct | 46°F | 31°F | 2" |
| Nov | 36°F | 23°F | 1" |
| Dec | 30°F | 18°F | 1" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Montana. Weather varies year to year, so treat these as a guide.
Sightings of rattlesnakes in Montana peak in June, when 123 of the year's 450 verified observations are logged — about 27.3% of the annual total. Activity stays high through June, July and May.
The quietest stretch is November, January and February, when rattlesnakes are hardest to find — no verified records exist for November. If a reliable sighting matters, plan around the peak window rather than the off-season.
The rattlesnakes you are most likely to encounter in Montana 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 Montana
- Big Hole National Battlefield — National Battlefield
- Bighorn Canyon National Recreation Area — National Recreation Area
- Grant-Kohrs Ranch National Historic Site — National Historic Site
- Lewis & Clark National Historic Trail — National Historic Trail
- Nez Perce National Historical Park — National Historical Park
- Yellowstone National Park — National Park
Frequently asked questions
What is the best month to see rattlesnakes in Montana?+
June is the single best month, and the broader peak window runs through June, July and May, based on 450 verified iNaturalist observations.
When are rattlesnakes hardest to see in Montana?+
November is the quietest month for rattlesnakes in Montana, with no verified records on iNaturalist.
Are rattlesnakes active year-round in Montana?+
Rattlesnakes are recorded in 11 of 12 months in Montana, so they can be seen year-round, with a clear peak in June.
More places to see rattlesnakes
More wildlife in Montana