Chipmunks in Illinois in August
Yes, August is a good month to see chipmunks in Illinois. It is the 6th busiest month of the year, with 412 of the 4,571 sightings logged across the year (9%), based on verified iNaturalist records.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Eastern Chipmunk · Public domain CC0
Eastern Chipmunk · Lexi Destria CC BY
Eastern Chipmunk · psweet CC BY-SA
Good month for chipmunks in Illinois
9%
of yearly sightings
412
records in August
#6
busiest month of 12
4,571
verified records a year
July 10.3%, August 9%, September 11.9%. Busiest month is May at 23.6%.
4,571 verified observations of chipmunks in Illinois, recorded across 12 months of the year on iNaturalist.
When chipmunks are recorded in Illinois
Peak month
May
1,080 records (23.6% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 5 | 0.1% |
| February | 21 | 0.5% |
| March | 309 | 6.8% |
| Aprilpeak | 628 | 13.7% |
| Maypeak | 1,080 | 23.6% |
| Junepeak | 715 | 15.6% |
| July | 473 | 10.3% |
| August | 412 | 9% |
| September | 542 | 11.9% |
| October | 330 | 7.2% |
| November | 49 | 1.1% |
| December | 7 | 0.2% |
Chipmunks you are most likely to see
| Species | Verified observations |
|---|---|
| Eastern Chipmunk | 4,567 |
In Illinois, August carries 9% of the year's chipmunks sightings, about 0.7 points above an even month-to-month split. That makes it the 6th busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from July (10.3%) into August, and it heads toward September (11.9%) after. The busiest month is May (23.6%), so if timing is flexible, that window is the safer bet.
The chipmunks most often recorded in Illinois are Eastern Chipmunk. Those counts are annual totals rather than a August split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in August itself.
Which chipmunks you are most likely to see
- Eastern Chipmunk4,567 records
Frequently asked questions
Can you see chipmunks in Illinois in August?+
Yes. August accounts for 412 of the 4,571 verified chipmunks sightings logged in Illinois across the year, which is 9% of the annual total.
Is August a good time to see chipmunks in Illinois?+
August is the 6th busiest month. It is workable, though May and June is the stronger window for a reliable sighting.
What month is best for chipmunks in Illinois?+
May is the single busiest month, with the broader peak running through May, June and April, based on 4,571 verified observations.
Which chipmunks are you most likely to see in Illinois?+
The most-recorded species in Illinois are Eastern Chipmunk, based on all-time iNaturalist counts.