Squirrels in Colorado in September
Yes, September is a good month to see squirrels in Colorado. It is the 5th busiest month of the year, with 3,715 of the 39,058 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 squirrels in Colorado
9.5%
of yearly sightings
3,715
records in September
#5
busiest month of 12
39,058
verified records a year
August 15.7%, September 9.5%, October 5%. Busiest month is July at 20.9%.
39,058 verified observations of squirrels in Colorado, recorded across 12 months of the year on iNaturalist.
When squirrels are recorded in Colorado
Peak month
July
8,163 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 | 4,044 | 10.4% |
| Junepeak | 7,081 | 18.1% |
| Julypeak | 8,163 | 20.9% |
| Augustpeak | 6,141 | 15.7% |
| September | 3,715 | 9.5% |
| October | 1,957 | 5% |
| November | 979 | 2.5% |
| December | 852 | 2.2% |
Squirrels you are most likely to see
| Species | Verified observations |
|---|---|
| Common Golden-mantled Ground Squirrel | 6,579 |
| Eastern Fox Squirrel | 6,373 |
| Black-tailed Prairie Dog | 6,354 |
| Yellow-bellied Marmot | 5,775 |
| Least Chipmunk | 2,167 |
| Fremont's Squirrel | 1,966 |
| Wyoming Ground Squirrel | 1,334 |
| Colorado Chipmunk | 1,070 |
In Colorado, September carries 9.5% of the year's squirrels 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 squirrels 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 squirrels you are most likely to see
- Common Golden-mantled Ground Squirrel6,579 records
- Eastern Fox Squirrel6,373 records
- Black-tailed Prairie Dog6,354 records
- Yellow-bellied Marmot5,775 records
- Least Chipmunk2,167 records
- Fremont's Squirrel1,966 records
Plan your squirrel 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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Use the live GetYourGuide widget to compare local departures and activity styles close to the main squirrel viewing area.
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Gear to see them
Frequently asked questions
Can you see squirrels in Colorado in September?+
Yes. September accounts for 3,715 of the 39,058 verified squirrels sightings logged in Colorado across the year, which is 9.5% of the annual total.
Is September a good time to see squirrels 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 squirrels in Colorado?+
July is the single busiest month, with the broader peak running through July, June and August, based on 39,058 verified observations.
Which squirrels 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 squirrels in Colorado in other months
More wildlife in Colorado