Frogs in Wisconsin in September
Yes, September is a good month to see frogs in Wisconsin. It is the 5th busiest month of the year, with 2,894 of the 22,498 sightings logged across the year (12.9%), 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 frogs in Wisconsin
12.9%
of yearly sightings
2,894
records in September
#5
busiest month of 12
22,498
verified records a year
August 19.4%, September 12.9%, October 3.1%. Busiest month is July at 20.3%.
22,498 verified observations of frogs in Wisconsin, recorded across 12 months of the year on iNaturalist.
When frogs are recorded in Wisconsin
Peak month
July
4,571 records (20.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 17 | 0.1% |
| February | 15 | 0.1% |
| March | 313 | 1.4% |
| April | 1,667 | 7.4% |
| May | 3,538 | 15.7% |
| Junepeak | 4,327 | 19.2% |
| Julypeak | 4,571 | 20.3% |
| Augustpeak | 4,367 | 19.4% |
| September | 2,894 | 12.9% |
| October | 689 | 3.1% |
| November | 82 | 0.4% |
| December | 18 | 0.1% |
Frogs you are most likely to see
| Species | Verified observations |
|---|---|
| American Toad | 6,415 |
| Green Frog | 3,847 |
| Northern Leopard Frog | 2,240 |
| Spring Peeper | 1,581 |
| American Bullfrog | 1,514 |
| Wood Frog | 1,443 |
| Gray Treefrog | 1,267 |
| Boreal Chorus Frog | 508 |
In Wisconsin, September carries 12.9% of the year's frogs sightings, about 4.6 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 is easing off from August (19.4%) into September, and it heads toward October (3.1%) after. The busiest month is July (20.3%), so if timing is flexible, that window is the safer bet.
The frogs most often recorded in Wisconsin are American Toad, Green Frog and Northern Leopard Frog. 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 frogs you are most likely to see
- American Toad6,415 records
- Green Frog3,847 records
- Northern Leopard Frog2,240 records
- Spring Peeper1,581 records
- American Bullfrog1,514 records
- Wood Frog1,443 records
Plan your frog 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.
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Use the live GetYourGuide widget to compare local departures and activity styles close to the main frog viewing area.
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Gear to see them
Frequently asked questions
Can you see frogs in Wisconsin in September?+
Yes. September accounts for 2,894 of the 22,498 verified frogs sightings logged in Wisconsin across the year, which is 12.9% of the annual total.
Is September a good time to see frogs in Wisconsin?+
September is the 5th busiest month. It is workable, though July and August is the stronger window for a reliable sighting.
What month is best for frogs in Wisconsin?+
July is the single busiest month, with the broader peak running through July, August and June, based on 22,498 verified observations.
Which frogs are you most likely to see in Wisconsin?+
The most-recorded species in Wisconsin are American Toad, Green Frog and Northern Leopard Frog, based on all-time iNaturalist counts.
See frogs in Wisconsin in other months
More wildlife in Wisconsin