Best Time to See Bold Jumping Spiders in Illinois
May, September and June is the best time to see bold jumping spiders in Illinois. Based on 3,707 verified iNaturalist observations, here is exactly when bold jumping spiders are most active across the year in Illinois.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 20, 2026.
Bold Jumping Spider · Trevor Edmonson CC BY
Bold Jumping Spider · threelark CC BY
Bold Jumping Spider · Public domain CC0
3,707 verified observations of bold jumping spiders in Illinois, recorded across 12 months of the year on iNaturalist.
When bold jumping spiders are recorded in Illinois
Peak month
May
708 records (19.1% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 19 | 0.5% |
| February | 19 | 0.5% |
| March | 96 | 2.6% |
| April | 327 | 8.8% |
| Maypeak | 708 | 19.1% |
| Junepeak | 634 | 17.1% |
| July | 293 | 7.9% |
| August | 402 | 10.8% |
| Septemberpeak | 659 | 17.8% |
| October | 461 | 12.4% |
| November | 71 | 1.9% |
| December | 18 | 0.5% |
Bold Jumping Spiders you are most likely to see
| Species | Verified observations |
|---|---|
| Bold Jumping Spider | 3,707 |
Weather to expect, source Open-Meteo
Typical weather in Illinois
Recent typical conditions by month, so you can plan a trip around both when bold jumping spiders are active and what the weather is doing. The best months to look for bold jumping spiders sit around 54 to 83 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 38°F | 23°F | 3" |
| Feb | 40°F | 22°F | 3.1" |
| Mar | 53°F | 34°F | 4.8" |
| Apr | 63°F | 43°F | 4.1" |
| Maybest time | 73°F | 54°F | 4.6" |
| Junbest time | 83°F | 64°F | 3.5" |
| Jul | 85°F | 68°F | 4.3" |
| Aug | 83°F | 66°F | 3.9" |
| Sepbest time | 79°F | 61°F | 3" |
| Oct | 65°F | 48°F | 4.9" |
| Nov | 52°F | 35°F | 1.8" |
| Dec | 45°F | 29°F | 2.3" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Illinois. Weather varies year to year, so treat these as a guide.
Sightings of bold jumping spiders in Illinois peak in May, when 708 of the year's 3,707 verified observations are logged — about 19.1% of the annual total. Activity stays high through May, September and June.
The quietest stretch is December, January and February, when bold jumping spiders are hardest to find — December sees just 18 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The bold jumping spiders you are most likely to encounter in Illinois are Bold Jumping Spider — 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 bold jumping spiders in Illinois
- Lewis & Clark National Historic Trail — National Historic Trail
- Lincoln Home National Historic Site — National Historic Site
- Emmett Till and Mamie Till-Mobley National Monument — National Monument
- Mormon Pioneer National Historic Trail — National Historic Trail
- New Philadelphia National Historic Site — National Historic Site
- Pullman National Historical Park — National Historical Park
Frequently asked questions
What is the best month to see bold jumping spiders in Illinois?+
May is the single best month, and the broader peak window runs through May, September and June, based on 3,707 verified iNaturalist observations.
When are bold jumping spiders hardest to see in Illinois?+
December is the quietest month for bold jumping spiders in Illinois, with only 18 verified records.
Are bold jumping spiders active year-round in Illinois?+
Bold jumping spiders are recorded in 12 of 12 months in Illinois, so they can be seen year-round, with a clear peak in May.
More wildlife in Illinois