Bats in Maine in September
Yes, September is a good month to see bats in Maine. It is the 4th busiest month of the year, with 21 of the 164 sightings logged across the year (12.8%), 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 Maine
12.8%
of yearly sightings
21
records in September
#4
busiest month of 12
164
verified records a year
August 22.6%, September 12.8%, October 4.3%. Busiest month is August at 22.6%.
164 verified observations of bats in Maine, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Maine
Peak month
August
37 records (22.6% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 3 | 1.8% |
| February | 1 | 0.6% |
| March | 8 | 4.9% |
| April | 10 | 6.1% |
| Maypeak | 24 | 14.6% |
| June | 18 | 11% |
| Julypeak | 29 | 17.7% |
| Augustpeak | 37 | 22.6% |
| September | 21 | 12.8% |
| October | 7 | 4.3% |
| November | 5 | 3% |
| December | 1 | 0.6% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Big Brown Bat | 67 |
| Little Brown Bat | 15 |
| Eastern Red Bat | 11 |
| Silver-haired Bat | 7 |
| Eastern Small-footed Myotis | 3 |
| Northern Hoary Bat | 2 |
In Maine, September carries 12.8% of the year's bats sightings, about 4.5 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 (22.6%) into September, and it heads toward October (4.3%) after. The busiest month is August (22.6%), so if timing is flexible, that window is the safer bet.
The bats most often recorded in Maine are Big Brown Bat, Little Brown Bat and Eastern Red 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 Bat67 records
- Little Brown Bat15 records
- Eastern Red Bat11 records
- Silver-haired Bat7 records
- Eastern Small-footed Myotis3 records
- Northern Hoary Bat2 records
Plan your bat trip in Maine
Start with live tours near Acadia National Park, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Acadia National Park
Use the live GetYourGuide widget to compare local departures and activity styles close to the main bat viewing area.
Booking.com
Stay nearbyStay near Acadia National Park
Compare hotels, cabins and lodges close to the best bat viewing area in Maine.
Viator
Broader backupBook a bat tour in Maine
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 Maine in September?+
Yes. September accounts for 21 of the 164 verified bats sightings logged in Maine across the year, which is 12.8% of the annual total.
Is September a good time to see bats in Maine?+
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 Maine?+
August is the single busiest month, with the broader peak running through August, July and May, based on 164 verified observations.
Which bats are you most likely to see in Maine?+
The most-recorded species in Maine are Big Brown Bat, Little Brown Bat and Eastern Red Bat, based on all-time iNaturalist counts.
See bats in Maine in other months
More places to see bats
More wildlife in Maine