Best Time to See Rattlesnakes in Washington
May, June and July is the best time to see rattlesnakes in Washington. Based on 945 verified iNaturalist observations, here is exactly when rattlesnakes are most active across the year in Washington.
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
945 verified observations of rattlesnakes in Washington, recorded across 9 months of the year on iNaturalist.
When rattlesnakes are recorded in Washington
Peak month
May
302 records (32% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 3 | 0.3% |
| April | 81 | 8.6% |
| Maypeak | 302 | 32% |
| Junepeak | 198 | 21% |
| Julypeak | 160 | 16.9% |
| August | 124 | 13.1% |
| September | 57 | 6% |
| October | 19 | 2% |
| November | 1 | 0.1% |
| December | 0 | 0% |
Rattlesnakes you are most likely to see
| Species | Verified observations |
|---|---|
| Western Rattlesnake | 945 |
Weather to expect, source Open-Meteo
Typical weather in Washington
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 44 to 86 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 35°F | 24°F | 4.5" |
| Feb | 36°F | 22°F | 2.8" |
| Mar | 46°F | 28°F | 1.2" |
| Apr | 56°F | 33°F | 1.3" |
| Maybest time | 67°F | 44°F | 1.2" |
| Junbest time | 76°F | 51°F | 0.9" |
| Julbest time | 86°F | 57°F | 0.2" |
| Aug | 86°F | 58°F | 0.3" |
| Sep | 74°F | 50°F | 1.1" |
| Oct | 59°F | 39°F | 1.7" |
| Nov | 42°F | 29°F | 3.6" |
| Dec | 33°F | 23°F | 3.6" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Washington. Weather varies year to year, so treat these as a guide.
Sightings of rattlesnakes in Washington peak in May, when 302 of the year's 945 verified observations are logged — about 32% of the annual total. Activity stays high through May, June and July.
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 Washington are 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 Washington
- Ebey's Landing National Historical Reserve — National Historical Reserve
- Fort Vancouver National Historic Site — National Historic Site
- Lewis & Clark National Historic Trail — National Historic Trail
- Lewis and Clark National Historical Park — National Historical Park
- Mount Rainier National Park — National Park
- Nez Perce National Historical Park — National Historical Park
Frequently asked questions
What is the best month to see rattlesnakes in Washington?+
May is the single best month, and the broader peak window runs through May, June and July, based on 945 verified iNaturalist observations.
When are rattlesnakes hardest to see in Washington?+
January is the quietest month for rattlesnakes in Washington, with no verified records on iNaturalist.
Are rattlesnakes active year-round in Washington?+
Rattlesnakes are recorded in 9 of 12 months in Washington, concentrated around May and June.
More wildlife in Washington