Best Time to See Blue Jays in Illinois
May, April and June is the best time to see blue jays in Illinois. Based on 4,143 verified iNaturalist observations, here is exactly when blue jays 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.
4,143 verified observations of blue jays in Illinois, recorded across 12 months of the year on iNaturalist.
When blue jays are recorded in Illinois
Peak month
May
742 records (17.9% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 250 | 6% |
| February | 181 | 4.4% |
| March | 205 | 4.9% |
| Aprilpeak | 617 | 14.9% |
| Maypeak | 742 | 17.9% |
| Junepeak | 371 | 9% |
| July | 263 | 6.3% |
| August | 252 | 6.1% |
| September | 326 | 7.9% |
| October | 332 | 8% |
| November | 330 | 8% |
| December | 274 | 6.6% |
Blue Jays you are most likely to see
| Species | Verified observations |
|---|---|
| Blue Jay | 4,143 |
Weather to expect, source Open-Meteo
Typical weather in Illinois
Recent typical conditions by month, so you can plan a trip around both when blue jays are active and what the weather is doing. The best months to look for blue jays sit around 43 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" |
| Aprbest time | 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" |
| Sep | 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 blue jays in Illinois peak in May, when 742 of the year's 4,143 verified observations are logged — about 17.9% of the annual total. Activity stays high through May, April and June.
The quietest stretch is February, March and January, when blue jays are hardest to find — February sees just 181 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The blue jays you are most likely to encounter in Illinois are Blue Jay — 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 blue jays 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 blue jays in Illinois?+
May is the single best month, and the broader peak window runs through May, April and June, based on 4,143 verified iNaturalist observations.
When are blue jays hardest to see in Illinois?+
February is the quietest month for blue jays in Illinois, with only 181 verified records.
Are blue jays active year-round in Illinois?+
Blue jays 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