Best Time to See Bats in Maine
August, July and May is the best time to see bats in Maine. Based on 164 verified iNaturalist observations, here is exactly when bats are most active across the year in Maine.
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 · Jason Hill CC BY
Eastern Small-footed Myotis · Joseph Rojas CC BY
Big Brown Bat · Hippytiger CC BY
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 |
Weather to expect, source Open-Meteo
Typical weather in Maine
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 43 to 80 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 28°F | 11°F | 4" |
| Feb | 28°F | 11°F | 3.1" |
| Mar | 39°F | 20°F | 2.7" |
| Apr | 51°F | 32°F | 4.8" |
| Maybest time | 64°F | 43°F | 3.2" |
| Jun | 74°F | 54°F | 3.7" |
| Julbest time | 80°F | 62°F | 4.9" |
| Augbest time | 77°F | 60°F | 4.7" |
| Sep | 69°F | 53°F | 4.4" |
| Oct | 58°F | 43°F | 5.3" |
| Nov | 43°F | 29°F | 3.8" |
| Dec | 34°F | 20°F | 5" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Maine. Weather varies year to year, so treat these as a guide.
More on bats in Maine:
Sightings of bats in Maine peak in August, when 37 of the year's 164 verified observations are logged — about 22.6% of the annual total. Activity stays high through August, July and May.
The quietest stretch is February and December, when bats are hardest to find — February sees just 1 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 Maine are Big Brown Bat, Little Brown 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 Maine
- Acadia National Park — National Park
- Appalachian National Scenic Trail — National Scenic Trail
- Katahdin Woods and Waters National Monument — National Monument
- Saint Croix Island International Historic Site — International Historic Site
- Frances Perkins National Monument — National Monument
- Maine Acadian Culture
Gear to see them
Frequently asked questions
What is the best month to see bats in Maine?+
August is the single best month, and the broader peak window runs through August, July and May, based on 164 verified iNaturalist observations.
When are bats hardest to see in Maine?+
February is the quietest month for bats in Maine, with only 1 verified records.
Are bats active year-round in Maine?+
Bats are recorded in 12 of 12 months in Maine, so they can be seen year-round, with a clear peak in August.