Best Time to See Black Widows in Colorado
September, August and October is the best time to see black widows in Colorado. Based on 1,949 verified iNaturalist observations, here is exactly when black widows are most active across the year in Colorado.
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
1,949 verified observations of black widows in Colorado, recorded across 12 months of the year on iNaturalist.
When black widows are recorded in Colorado
Peak month
September
511 records (26.2% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 6 | 0.3% |
| February | 8 | 0.4% |
| March | 36 | 1.8% |
| April | 90 | 4.6% |
| May | 129 | 6.6% |
| June | 145 | 7.4% |
| July | 178 | 9.1% |
| Augustpeak | 364 | 18.7% |
| Septemberpeak | 511 | 26.2% |
| Octoberpeak | 314 | 16.1% |
| November | 130 | 6.7% |
| December | 38 | 1.9% |
Black Widows you are most likely to see
| Species | Verified observations |
|---|---|
| Western Black Widow | 1,851 |
Weather to expect, source Open-Meteo
Typical weather in Colorado
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 27 to 75 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 27°F | 5°F | 0.5" |
| Feb | 27°F | 3°F | 0.9" |
| Mar | 34°F | 9°F | 1.3" |
| Apr | 46°F | 20°F | 1.1" |
| May | 57°F | 31°F | 2.5" |
| Jun | 69°F | 42°F | 2.1" |
| Jul | 76°F | 49°F | 2.5" |
| Augbest time | 75°F | 48°F | 1.7" |
| Sepbest time | 69°F | 41°F | 1.1" |
| Octbest time | 54°F | 27°F | 0.8" |
| Nov | 40°F | 18°F | 0.6" |
| Dec | 30°F | 10°F | 0.9" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Colorado. Weather varies year to year, so treat these as a guide.
Sightings of black widows in Colorado peak in September, when 511 of the year's 1,949 verified observations are logged — about 26.2% of the annual total. Activity stays high through September, August and October.
The quietest stretch is January and February, when black widows are hardest to find — January sees just 6 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 Colorado 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 Colorado
- Bent's Old Fort National Historic Site — National Historic Site
- Black Canyon Of The Gunnison National Park — National Park
- Colorado National Monument — National Monument
- Curecanti National Recreation Area — National Recreation Area
- Dinosaur National Monument — National Monument
- Great Sand Dunes National Park & Preserve — National Park & Preserve
Frequently asked questions
What is the best month to see black widows in Colorado?+
September is the single best month, and the broader peak window runs through September, August and October, based on 1,949 verified iNaturalist observations.
When are black widows hardest to see in Colorado?+
January is the quietest month for black widows in Colorado, with only 6 verified records.
Are black widows active year-round in Colorado?+
Black widows are recorded in 12 of 12 months in Colorado, so they can be seen year-round, with a clear peak in September.
More wildlife in Colorado