Bats in Michigan in September
Yes, September is a good month to see bats in Michigan. It is the 4th busiest month of the year, with 83 of the 683 sightings logged across the year (12.2%), 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 bats in Michigan
12.2%
of yearly sightings
83
records in September
#4
busiest month of 12
683
verified records a year
August 21.8%, September 12.2%, October 3.2%. Busiest month is August at 21.8%.
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 |
In Michigan, September carries 12.2% of the year's bats sightings, about 3.9 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 (21.8%) into September, and it heads toward October (3.2%) after. The busiest month is August (21.8%), so if timing is flexible, that window is the safer bet.
The bats most often recorded in Michigan are Big Brown Bat, Little Brown Bat and Silver-haired Bat. 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 bats you are most likely to see
- Big Brown Bat299 records
- Little Brown Bat57 records
- Silver-haired Bat45 records
- Eastern Red Bat41 records
- Northern Hoary Bat21 records
- Northern Myotis8 records
Plan your bat trip in Michigan
Start with live tours near Isle Royale National Park, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
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Live tours nearbySee live tours near Isle Royale National Park
Use the live GetYourGuide widget to compare local departures and activity styles close to the main bat viewing area.
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Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Gear to see them
Frequently asked questions
Can you see bats in Michigan in September?+
Yes. September accounts for 83 of the 683 verified bats sightings logged in Michigan across the year, which is 12.2% of the annual total.
Is September a good time to see bats in Michigan?+
September is the 4th busiest month. It is workable, though August and July is the stronger window for a reliable sighting.
What month is best for bats in Michigan?+
August is the single busiest month, with the broader peak running through August, July and May, based on 683 verified observations.
Which bats are you most likely to see in Michigan?+
The most-recorded species in Michigan are Big Brown Bat, Little Brown Bat and Silver-haired Bat, based on all-time iNaturalist counts.
See bats in Michigan in other months
More places to see bats
More wildlife in Michigan