Snakes in Colorado in September
Yes, September is a good month to see snakes in Colorado. It is the 5th busiest month of the year, with 4,216 of the 36,554 sightings logged across the year (11.5%), 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 July 2, 2026.
Good month for snakes in Colorado
11.5%
of yearly sightings
4,216
records in September
#5
busiest month of 12
36,554
verified records a year
August 14.1%, September 11.5%, October 4.3%. Busiest month is June at 22.3%.
36,554 verified observations of snakes in Colorado, recorded across 12 months of the year on iNaturalist.
When snakes are recorded in Colorado
Peak month
June
8,145 records (22.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 22 | 0.1% |
| February | 48 | 0.1% |
| March | 417 | 1.1% |
| April | 2,619 | 7.2% |
| Maypeak | 7,409 | 20.3% |
| Junepeak | 8,145 | 22.3% |
| Julypeak | 6,684 | 18.3% |
| August | 5,163 | 14.1% |
| September | 4,216 | 11.5% |
| October | 1,559 | 4.3% |
| November | 235 | 0.6% |
| December | 37 | 0.1% |
Snakes you are most likely to see
| Species | Verified observations |
|---|---|
| Western Terrestrial Garter Snake | 6,118 |
| Gopher Snake | 5,626 |
| Prairie Lizard | 3,720 |
| Prairie Rattlesnake | 3,127 |
| Plateau Fence Lizard | 1,798 |
| Plains Garter Snake | 1,742 |
| North American Racer | 1,431 |
| Eastern Collared Lizard | 1,370 |
In Colorado, September carries 11.5% of the year's snakes sightings, about 3.2 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 (14.1%) into September, and it heads toward October (4.3%) after. The busiest month is June (22.3%), so if timing is flexible, that window is the safer bet.
The snakes most often recorded in Colorado are Western Terrestrial Garter Snake, Gopher Snake and Prairie Lizard. 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 snakes you are most likely to see
- Western Terrestrial Garter Snake6,118 records
- Gopher Snake5,626 records
- Prairie Lizard3,720 records
- Prairie Rattlesnake3,127 records
- Plateau Fence Lizard1,798 records
- Plains Garter Snake1,742 records
Plan your snake 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 snake viewing area.
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Gear to see them
Frequently asked questions
Can you see snakes in Colorado in September?+
Yes. September accounts for 4,216 of the 36,554 verified snakes sightings logged in Colorado across the year, which is 11.5% of the annual total.
Is September a good time to see snakes in Colorado?+
September is the 5th busiest month. It is workable, though June and May is the stronger window for a reliable sighting.
What month is best for snakes in Colorado?+
June is the single busiest month, with the broader peak running through June, May and July, based on 36,554 verified observations.
Which snakes are you most likely to see in Colorado?+
The most-recorded species in Colorado are Western Terrestrial Garter Snake, Gopher Snake and Prairie Lizard, based on all-time iNaturalist counts.
See snakes in Colorado in other months
More places to see snakes
More wildlife in Colorado