Best Time to See Black Widows in Idaho
September, October and August is the best time to see black widows in Idaho. Based on 503 verified iNaturalist observations, here is exactly when black widows are most active across the year in Idaho.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Northern Black Widow · Joseph McPhail CC BY
Western Black Widow · Rebecca Ray CC BY
Western Black Widow · Michael Eisen CC BY
503 verified observations of black widows in Idaho, recorded across 12 months of the year on iNaturalist.
When black widows are recorded in Idaho
Peak month
September
122 records (24.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 11 | 2.2% |
| February | 8 | 1.6% |
| March | 19 | 3.8% |
| April | 26 | 5.2% |
| May | 57 | 11.3% |
| June | 38 | 7.6% |
| July | 38 | 7.6% |
| Augustpeak | 69 | 13.7% |
| Septemberpeak | 122 | 24.3% |
| Octoberpeak | 76 | 15.1% |
| November | 25 | 5% |
| December | 14 | 2.8% |
Black Widows you are most likely to see
| Species | Verified observations |
|---|---|
| Western Black Widow | 484 |
Weather to expect, source Open-Meteo
Typical weather in Idaho
Recent typical conditions by month, so you can plan a trip around both when black widows are active and what the weather is doing. The best months to look for black widows sit around 29 to 81 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 31°F | 13°F | 1.6" |
| Feb | 32°F | 14°F | 2.4" |
| Mar | 41°F | 20°F | 1.7" |
| Apr | 48°F | 25°F | 1.9" |
| May | 60°F | 35°F | 2.9" |
| Jun | 71°F | 44°F | 2.9" |
| Jul | 82°F | 51°F | 1.2" |
| Augbest time | 81°F | 51°F | 1.9" |
| Sepbest time | 71°F | 43°F | 1.9" |
| Octbest time | 54°F | 29°F | 1.8" |
| Nov | 40°F | 19°F | 1.8" |
| Dec | 31°F | 13°F | 1.8" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Idaho. Weather varies year to year, so treat these as a guide.
Sightings of black widows in Idaho peak in September, when 122 of the year's 503 verified observations are logged — about 24.3% of the annual total. Activity stays high through September, October and August.
The quietest stretch is February and January, when black widows are hardest to find — February sees just 8 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The black widows you are most likely to encounter in Idaho are Western Black Widow — 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 black widows in Idaho
- City Of Rocks National Reserve — National Reserve
- Craters Of The Moon National Monument & Preserve — National Monument & Preserve
- Hagerman Fossil Beds National Monument — National Monument
- 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 black widows in Idaho?+
September is the single best month, and the broader peak window runs through September, October and August, based on 503 verified iNaturalist observations.
When are black widows hardest to see in Idaho?+
February is the quietest month for black widows in Idaho, with only 8 verified records.
Are black widows active year-round in Idaho?+
Black widows are recorded in 12 of 12 months in Idaho, so they can be seen year-round, with a clear peak in September.
More wildlife in Idaho