Deer in Colorado in September
Yes, September is a good month to see deer in Colorado. It is the 6th busiest month of the year, with 1,719 of the 18,926 sightings logged across the year (9.1%), 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 July 2, 2026.
Good month for deer in Colorado
9.1%
of yearly sightings
1,719
records in September
#6
busiest month of 12
18,926
verified records a year
August 11.9%, September 9.1%, October 7.1%. Busiest month is July at 14%.
18,926 verified observations of deer in Colorado, recorded across 12 months of the year on iNaturalist.
When deer are recorded in Colorado
Peak month
July
2,658 records (14% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 796 | 4.2% |
| February | 708 | 3.7% |
| March | 1,057 | 5.6% |
| April | 1,745 | 9.2% |
| May | 1,817 | 9.6% |
| Junepeak | 2,503 | 13.2% |
| Julypeak | 2,658 | 14% |
| Augustpeak | 2,250 | 11.9% |
| September | 1,719 | 9.1% |
| October | 1,345 | 7.1% |
| November | 1,281 | 6.8% |
| December | 1,047 | 5.5% |
Deer you are most likely to see
| Species | Verified observations |
|---|---|
| Mule Deer | 16,519 |
| White-tailed Deer | 2,104 |
| Mule × White-tailed Deer | 2 |
In Colorado, September carries 9.1% of the year's deer sightings, about 0.8 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 August (11.9%) into September, and it heads toward October (7.1%) after. The busiest month is July (14%), so if timing is flexible, that window is the safer bet.
The deer most often recorded in Colorado are Mule Deer, White-tailed Deer and Mule × White-tailed Deer. 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 deer you are most likely to see
- Mule Deer16,519 records
- White-tailed Deer2,104 records
- Mule × White-tailed Deer2 records
Plan your deer 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 deer viewing area.
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Stay nearbyStay near Bent's Old Fort National Historic Site
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Gear to see them
Frequently asked questions
Can you see deer in Colorado in September?+
Yes. September accounts for 1,719 of the 18,926 verified deer sightings logged in Colorado across the year, which is 9.1% of the annual total.
Is September a good time to see deer in Colorado?+
September is the 6th busiest month. It is workable, though July and June is the stronger window for a reliable sighting.
What month is best for deer in Colorado?+
July is the single busiest month, with the broader peak running through July, June and August, based on 18,926 verified observations.
Which deer are you most likely to see in Colorado?+
The most-recorded species in Colorado are Mule Deer, White-tailed Deer and Mule × White-tailed Deer, based on all-time iNaturalist counts.
See deer in Colorado in other months
More places to see deer
More wildlife in Colorado