Best Time to See Bats in Michigan
August, July and May is the best time to see bats in Michigan. Based on 683 verified iNaturalist observations, here is exactly when bats are most active across the year in Michigan.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Silver-haired Bat · nelso334 CC BY
Northern Myotis · Steven Joyner CC BY
Big Brown Bat · Tristan A. McKnight CC BY
683 verified observations of bats in Michigan, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Michigan
Peak month
August
149 records (21.8% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 8 | 1.2% |
| February | 12 | 1.8% |
| March | 21 | 3.1% |
| April | 64 | 9.4% |
| Maypeak | 85 | 12.4% |
| June | 82 | 12% |
| Julypeak | 114 | 16.7% |
| Augustpeak | 149 | 21.8% |
| September | 83 | 12.2% |
| October | 22 | 3.2% |
| November | 27 | 4% |
| December | 16 | 2.3% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Big Brown Bat | 299 |
| Little Brown Bat | 57 |
| Silver-haired Bat | 45 |
| Eastern Red Bat | 41 |
| Northern Hoary Bat | 21 |
| Northern Myotis | 8 |
| Tri-coloured Bat | 3 |
| Evening Bat | 1 |
Weather to expect, source Open-Meteo
Typical weather in Michigan
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 45 to 80 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 27°F | 16°F | 2.3" |
| Feb | 28°F | 13°F | 2.4" |
| Mar | 40°F | 23°F | 3" |
| Apr | 51°F | 33°F | 2.8" |
| Maybest time | 65°F | 45°F | 3.7" |
| Jun | 76°F | 55°F | 2.8" |
| Julbest time | 80°F | 61°F | 3.6" |
| Augbest time | 77°F | 59°F | 3.3" |
| Sep | 69°F | 53°F | 3.4" |
| Oct | 55°F | 42°F | 4.7" |
| Nov | 42°F | 30°F | 2.5" |
| Dec | 34°F | 23°F | 2.7" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Michigan. Weather varies year to year, so treat these as a guide.
More on bats in Michigan:
Sightings of bats in Michigan peak in August, when 149 of the year's 683 verified observations are logged — about 21.8% of the annual total. Activity stays high through August, July and May.
The quietest stretch is January and February, when bats are hardest to find — January sees just 8 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 Michigan are Big Brown Bat, Little Brown Bat and Silver-haired 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 Michigan
- Isle Royale National Park — National Park
- North Country National Scenic Trail — National Scenic Trail
- Pictured Rocks National Lakeshore — National Lakeshore
- River Raisin National Battlefield Park — National Battlefield Park
- Sleeping Bear Dunes National Lakeshore — National Lakeshore
- Keweenaw National Historical Park — National Historical Park
Gear to see them
Frequently asked questions
What is the best month to see bats in Michigan?+
August is the single best month, and the broader peak window runs through August, July and May, based on 683 verified iNaturalist observations.
When are bats hardest to see in Michigan?+
January is the quietest month for bats in Michigan, with only 8 verified records.
Are bats active year-round in Michigan?+
Bats are recorded in 12 of 12 months in Michigan, so they can be seen year-round, with a clear peak in August.
More places to see bats
More wildlife in Michigan