Best Time to See Black Widows in Utah
September, October and August is the best time to see black widows in Utah. Based on 1,851 verified iNaturalist observations, here is exactly when black widows are most active across the year in Utah.
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
1,851 verified observations of black widows in Utah, recorded across 12 months of the year on iNaturalist.
When black widows are recorded in Utah
Peak month
September
447 records (24.1% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 11 | 0.6% |
| February | 10 | 0.5% |
| March | 47 | 2.5% |
| April | 99 | 5.3% |
| May | 126 | 6.8% |
| June | 133 | 7.2% |
| July | 233 | 12.6% |
| Augustpeak | 311 | 16.8% |
| Septemberpeak | 447 | 24.1% |
| Octoberpeak | 329 | 17.8% |
| November | 83 | 4.5% |
| December | 22 | 1.2% |
Black Widows you are most likely to see
| Species | Verified observations |
|---|---|
| Western Black Widow | 1,782 |
| Brown Widow | 2 |
Weather to expect, source Open-Meteo
Typical weather in Utah
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 38 to 87 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 33°F | 19°F | 1.5" |
| Feb | 35°F | 20°F | 1.5" |
| Mar | 43°F | 27°F | 2.8" |
| Apr | 55°F | 33°F | 1.6" |
| May | 66°F | 42°F | 1.3" |
| Jun | 79°F | 53°F | 0.7" |
| Jul | 89°F | 62°F | 0.3" |
| Augbest time | 87°F | 61°F | 0.3" |
| Sepbest time | 78°F | 52°F | 0.6" |
| Octbest time | 62°F | 38°F | 1.1" |
| Nov | 48°F | 28°F | 1.3" |
| Dec | 36°F | 20°F | 2.6" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Utah. Weather varies year to year, so treat these as a guide.
Sightings of black widows in Utah peak in September, when 447 of the year's 1,851 verified observations are logged — about 24.1% 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 10 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 Utah are Western Black Widow and Brown 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 Utah
- Bryce Canyon National Park — National Park
- Capitol Reef National Park — National Park
- Cedar Breaks National Monument — National Monument
- Dinosaur National Monument — National Monument
- Zion National Park — National Park
- Arches National Park — National Park
Frequently asked questions
What is the best month to see black widows in Utah?+
September is the single best month, and the broader peak window runs through September, October and August, based on 1,851 verified iNaturalist observations.
When are black widows hardest to see in Utah?+
February is the quietest month for black widows in Utah, with only 10 verified records.
Are black widows active year-round in Utah?+
Black widows are recorded in 12 of 12 months in Utah, so they can be seen year-round, with a clear peak in September.
More wildlife in Utah