Chipmunks in Colorado in September
Yes, September is a good month to see chipmunks in Colorado. It is the 5th busiest month of the year, with 3,715 of the 39,043 sightings logged across the year (9.5%), 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.
Good month for chipmunks in Colorado
9.5%
of yearly sightings
3,715
records in September
#5
busiest month of 12
39,043
verified records a year
August 15.7%, September 9.5%, October 5%. Busiest month is July at 20.9%.
39,043 verified observations of chipmunks in Colorado, recorded across 12 months of the year on iNaturalist.
When chipmunks are recorded in Colorado
Peak month
July
8,155 records (20.9% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 883 | 2.3% |
| February | 780 | 2% |
| March | 1,348 | 3.5% |
| April | 3,115 | 8% |
| May | 4,043 | 10.4% |
| Junepeak | 7,075 | 18.1% |
| Julypeak | 8,155 | 20.9% |
| Augustpeak | 6,141 | 15.7% |
| September | 3,715 | 9.5% |
| October | 1,957 | 5% |
| November | 979 | 2.5% |
| December | 852 | 2.2% |
Chipmunks you are most likely to see
| Species | Verified observations |
|---|---|
| Common Golden-mantled Ground Squirrel | 6,577 |
| Eastern Fox Squirrel | 6,371 |
| Black-tailed Prairie Dog | 6,354 |
| Yellow-bellied Marmot | 5,770 |
| Least Chipmunk | 2,167 |
| Fremont's Squirrel | 1,964 |
| Wyoming Ground Squirrel | 1,334 |
| Colorado Chipmunk | 1,070 |
In Colorado, September carries 9.5% of the year's chipmunks sightings, about 1.2 points above an even month-to-month split. That makes it the 5th busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from August (15.7%) into September, and it heads toward October (5%) after. The busiest month is July (20.9%), so if timing is flexible, that window is the safer bet.
The chipmunks most often recorded in Colorado are Common Golden-mantled Ground Squirrel, Eastern Fox Squirrel and Black-tailed Prairie Dog. Those counts are annual totals rather than a September split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in September itself.
Which chipmunks you are most likely to see
- Common Golden-mantled Ground Squirrel6,577 records
- Eastern Fox Squirrel6,371 records
- Black-tailed Prairie Dog6,354 records
- Yellow-bellied Marmot5,770 records
- Least Chipmunk2,167 records
- Fremont's Squirrel1,964 records
Plan your chipmunk trip in Colorado
Start with live tours near Bent's Old Fort National Historic Site, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
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Live tours nearbySee live tours near Bent's Old Fort National Historic Site
Use the live GetYourGuide widget to compare local departures and activity styles close to the main chipmunk viewing area.
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Frequently asked questions
Can you see chipmunks in Colorado in September?+
Yes. September accounts for 3,715 of the 39,043 verified chipmunks sightings logged in Colorado across the year, which is 9.5% of the annual total.
Is September a good time to see chipmunks in Colorado?+
September is the 5th busiest month. It is workable, though July and June is the stronger window for a reliable sighting.
What month is best for chipmunks in Colorado?+
July is the single busiest month, with the broader peak running through July, June and August, based on 39,043 verified observations.
Which chipmunks are you most likely to see in Colorado?+
The most-recorded species in Colorado are Common Golden-mantled Ground Squirrel, Eastern Fox Squirrel and Black-tailed Prairie Dog, based on all-time iNaturalist counts.
See chipmunks in Colorado in other months
More wildlife in Colorado