Otters in Colorado in September
Yes, September is a good month to see otters in Colorado. It is the 5th busiest month of the year, with 12 of the 135 sightings logged across the year (8.9%), 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.
Good month for otters in Colorado
8.9%
of yearly sightings
12
records in September
#5
busiest month of 12
135
verified records a year
August 8.9%, September 8.9%, October 7.4%. Busiest month is April at 21.5%.
135 verified observations of otters in Colorado, recorded across 12 months of the year on iNaturalist.
When otters are recorded in Colorado
Peak month
April
29 records (21.5% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 7 | 5.2% |
| February | 8 | 5.9% |
| Marchpeak | 16 | 11.9% |
| Aprilpeak | 29 | 21.5% |
| May | 7 | 5.2% |
| June | 9 | 6.7% |
| July | 5 | 3.7% |
| August | 12 | 8.9% |
| September | 12 | 8.9% |
| October | 10 | 7.4% |
| Novemberpeak | 13 | 9.6% |
| December | 7 | 5.2% |
Otters you are most likely to see
| Species | Verified observations |
|---|---|
| North American River Otter | 135 |
In Colorado, September carries 8.9% of the year's otters sightings, about 0.6 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 holds steady between August and September, and it heads toward October (7.4%) after. The busiest month is April (21.5%), so if timing is flexible, that window is the safer bet.
The otters most often recorded in Colorado are North American River Otter. 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 otters you are most likely to see
- North American River Otter135 records
Plan your otter 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.
GetYourGuide
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 otter viewing area.
Booking.com
Stay nearbyStay near Bent's Old Fort National Historic Site
Compare hotels, cabins and lodges close to the best otter viewing area in Colorado.
Viator
Broader backupBook a otter tour in Colorado
Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Frequently asked questions
Can you see otters in Colorado in September?+
Yes. September accounts for 12 of the 135 verified otters sightings logged in Colorado across the year, which is 8.9% of the annual total.
Is September a good time to see otters in Colorado?+
September is the 5th busiest month. It is workable, though April and March is the stronger window for a reliable sighting.
What month is best for otters in Colorado?+
April is the single busiest month, with the broader peak running through April, March and November, based on 135 verified observations.
Which otters are you most likely to see in Colorado?+
The most-recorded species in Colorado are North American River Otter, based on all-time iNaturalist counts.
See otters in Colorado in other months
More wildlife in Colorado