Otters in Wisconsin in September
Yes, September is a good month to see otters in Wisconsin. It is the 4th busiest month of the year, with 31 of the 307 sightings logged across the year (10.1%), 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 June 28, 2026.
Good month for otters in Wisconsin
10.1%
of yearly sightings
31
records in September
#4
busiest month of 12
307
verified records a year
August 12.7%, September 10.1%, October 6.5%. Busiest month is May at 13.4%.
307 verified observations of otters in Wisconsin, recorded across 12 months of the year on iNaturalist.
When otters are recorded in Wisconsin
Peak month
May
41 records (13.4% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 19 | 6.2% |
| February | 17 | 5.5% |
| March | 22 | 7.2% |
| April | 26 | 8.5% |
| Maypeak | 41 | 13.4% |
| Junepeak | 32 | 10.4% |
| July | 21 | 6.8% |
| Augustpeak | 39 | 12.7% |
| September | 31 | 10.1% |
| October | 20 | 6.5% |
| November | 20 | 6.5% |
| December | 19 | 6.2% |
Otters you are most likely to see
| Species | Verified observations |
|---|---|
| North American River Otter | 307 |
In Wisconsin, September carries 10.1% of the year's otters sightings, about 1.8 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 easing off from August (12.7%) into September, and it heads toward October (6.5%) after. The busiest month is May (13.4%), so if timing is flexible, that window is the safer bet.
The otters most often recorded in Wisconsin 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 Otter307 records
Plan your otter trip in Wisconsin
Start with live tours near Apostle Islands National Lakeshore, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Apostle Islands National Lakeshore
Use the live GetYourGuide widget to compare local departures and activity styles close to the main otter viewing area.
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Stay nearbyStay near Apostle Islands National Lakeshore
Compare hotels, cabins and lodges close to the best otter viewing area in Wisconsin.
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Broader backupBook a otter tour in Wisconsin
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 Wisconsin in September?+
Yes. September accounts for 31 of the 307 verified otters sightings logged in Wisconsin across the year, which is 10.1% of the annual total.
Is September a good time to see otters in Wisconsin?+
September is the 4th busiest month. It is workable, though May and August is the stronger window for a reliable sighting.
What month is best for otters in Wisconsin?+
May is the single busiest month, with the broader peak running through May, August and June, based on 307 verified observations.
Which otters are you most likely to see in Wisconsin?+
The most-recorded species in Wisconsin are North American River Otter, based on all-time iNaturalist counts.
See otters in Wisconsin in other months
More wildlife in Wisconsin