Best Time to See Bats in Wisconsin
August, July and September is the best time to see bats in Wisconsin. Based on 546 verified iNaturalist observations, here is exactly when bats are most active across the year in Wisconsin.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
546 verified observations of bats in Wisconsin, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Wisconsin
Peak month
August
116 records (21.2% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 10 | 1.8% |
| February | 9 | 1.6% |
| March | 23 | 4.2% |
| April | 42 | 7.7% |
| May | 59 | 10.8% |
| June | 61 | 11.2% |
| Julypeak | 72 | 13.2% |
| Augustpeak | 116 | 21.2% |
| Septemberpeak | 62 | 11.4% |
| October | 60 | 11% |
| November | 19 | 3.5% |
| December | 13 | 2.4% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Big Brown Bat | 212 |
| Silver-haired Bat | 50 |
| Eastern Red Bat | 49 |
| Little Brown Bat | 48 |
| Northern Hoary Bat | 15 |
| Tri-coloured Bat | 10 |
| Northern Myotis | 1 |
Weather to expect, source Open-Meteo
Typical weather in Wisconsin
Recent typical conditions by month, so you can plan a trip around both when bats are active and what the weather is doing. The best months to look for bats sit around 53 to 80 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 25°F | 10°F | 1.4" |
| Feb | 25°F | 7°F | 2" |
| Mar | 40°F | 21°F | 2.7" |
| Apr | 52°F | 32°F | 3.9" |
| May | 65°F | 45°F | 3.4" |
| Jun | 77°F | 57°F | 3.8" |
| Julbest time | 80°F | 61°F | 3.5" |
| Augbest time | 77°F | 60°F | 3.5" |
| Sepbest time | 70°F | 53°F | 3" |
| Oct | 55°F | 40°F | 3.3" |
| Nov | 41°F | 27°F | 2.4" |
| Dec | 32°F | 17°F | 1.9" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Wisconsin. Weather varies year to year, so treat these as a guide.
More on bats in Wisconsin:
Sightings of bats in Wisconsin peak in August, when 116 of the year's 546 verified observations are logged — about 21.2% of the annual total. Activity stays high through August, July and September.
The quietest stretch is February, January and December, when bats are hardest to find — February sees just 9 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The bats you are most likely to encounter in Wisconsin are Big Brown Bat, Silver-haired Bat and Eastern Red Bat — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see bats in Wisconsin
- Apostle Islands National Lakeshore — National Lakeshore
- Ice Age National Scenic Trail — National Scenic Trail
- North Country National Scenic Trail — National Scenic Trail
- Saint Croix National Scenic Riverway — National Scenic Riverway
Gear to see them
Frequently asked questions
What is the best month to see bats in Wisconsin?+
August is the single best month, and the broader peak window runs through August, July and September, based on 546 verified iNaturalist observations.
When are bats hardest to see in Wisconsin?+
February is the quietest month for bats in Wisconsin, with only 9 verified records.
Are bats active year-round in Wisconsin?+
Bats are recorded in 12 of 12 months in Wisconsin, so they can be seen year-round, with a clear peak in August.
More places to see bats
More wildlife in Wisconsin