Snakes in Iowa in September
Yes, September is a good month to see snakes in Iowa. It is the 4th busiest month of the year, with 553 of the 4,327 sightings logged across the year (12.8%), 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 snakes in Iowa
12.8%
of yearly sightings
553
records in September
#4
busiest month of 12
4,327
verified records a year
August 8.9%, September 12.8%, October 10.5%. Busiest month is May at 23.2%.
4,327 verified observations of snakes in Iowa, recorded across 12 months of the year on iNaturalist.
When snakes are recorded in Iowa
Peak month
May
1,006 records (23.2% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 2 | 0% |
| February | 11 | 0.3% |
| March | 126 | 2.9% |
| Aprilpeak | 569 | 13.1% |
| Maypeak | 1,006 | 23.2% |
| Junepeak | 727 | 16.8% |
| July | 394 | 9.1% |
| August | 383 | 8.9% |
| September | 553 | 12.8% |
| October | 454 | 10.5% |
| November | 98 | 2.3% |
| December | 4 | 0.1% |
Snakes you are most likely to see
| Species | Verified observations |
|---|---|
| Common Garter Snake | 818 |
| DeKay's Brownsnake | 748 |
| Common Watersnake | 686 |
| Western Foxsnake | 617 |
| Plains Garter Snake | 363 |
| Eastern Milksnake | 172 |
| Western Ratsnake | 109 |
| North American Racer | 95 |
In Iowa, September carries 12.8% of the year's snakes sightings, about 4.5 points above an even month-to-month split. That makes it the 4th busiest of the twelve months, out of 12 months with recorded activity.
Activity is rising from August (8.9%) into September, and it heads toward October (10.5%) after. The busiest month is May (23.2%), so if timing is flexible, that window is the safer bet.
The snakes most often recorded in Iowa are Common Garter Snake, DeKay's Brownsnake and Common Watersnake. 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
- Common Garter Snake818 records
- DeKay's Brownsnake748 records
- Common Watersnake686 records
- Western Foxsnake617 records
- Plains Garter Snake363 records
- Eastern Milksnake172 records
Plan your snake trip in Iowa
Start with live tours near Effigy Mounds National Monument, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
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Gear to see them
Frequently asked questions
Can you see snakes in Iowa in September?+
Yes. September accounts for 553 of the 4,327 verified snakes sightings logged in Iowa across the year, which is 12.8% of the annual total.
Is September a good time to see snakes in Iowa?+
September is the 4th busiest month. It is workable, though May and June is the stronger window for a reliable sighting.
What month is best for snakes in Iowa?+
May is the single busiest month, with the broader peak running through May, June and April, based on 4,327 verified observations.
Which snakes are you most likely to see in Iowa?+
The most-recorded species in Iowa are Common Garter Snake, DeKay's Brownsnake and Common Watersnake, based on all-time iNaturalist counts.
See snakes in Iowa in other months
More places to see snakes
More wildlife in Iowa