Best Time to See Bats in Indiana
August, June and April is the best time to see bats in Indiana. Based on 576 verified iNaturalist observations, here is exactly when bats are most active across the year in Indiana.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 2, 2026.
576 verified observations of bats in Indiana, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Indiana
Peak month
August
93 records (16.1% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 10 | 1.7% |
| February | 23 | 4% |
| March | 36 | 6.3% |
| Aprilpeak | 67 | 11.6% |
| May | 63 | 10.9% |
| Junepeak | 83 | 14.4% |
| July | 65 | 11.3% |
| Augustpeak | 93 | 16.1% |
| September | 54 | 9.4% |
| October | 40 | 6.9% |
| November | 24 | 4.2% |
| December | 18 | 3.1% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Big Brown Bat | 212 |
| Eastern Red Bat | 76 |
| Tri-coloured Bat | 38 |
| Silver-haired Bat | 33 |
| Evening Bat | 12 |
| Little Brown Bat | 11 |
| Indiana Bat | 6 |
| Northern Hoary Bat | 3 |
Weather to expect, source Open-Meteo
Typical weather in Indiana
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 42 to 83 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 38°F | 24°F | 3.6" |
| Feb | 41°F | 24°F | 3.7" |
| Mar | 52°F | 33°F | 5.3" |
| Aprbest time | 61°F | 42°F | 3.6" |
| May | 71°F | 53°F | 4.5" |
| Junbest time | 81°F | 63°F | 3.2" |
| Jul | 84°F | 67°F | 4.7" |
| Augbest time | 83°F | 66°F | 3.6" |
| Sep | 78°F | 60°F | 1.8" |
| Oct | 65°F | 48°F | 4.4" |
| Nov | 51°F | 34°F | 2.3" |
| Dec | 44°F | 29°F | 3" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Indiana. Weather varies year to year, so treat these as a guide.
Sightings of bats in Indiana peak in August, when 93 of the year's 576 verified observations are logged — about 16.1% of the annual total. Activity stays high through August, June and April.
The quietest stretch is January, when bats are hardest to find — January sees just 10 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 Indiana are Big Brown Bat, Eastern Red Bat and Tri-coloured 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 Indiana
- Indiana Dunes National Park — National Park
- Lewis & Clark National Historic Trail — National Historic Trail
- Lincoln Boyhood National Memorial — National Memorial
- George Rogers Clark National Historical Park — National Historical Park
Gear to see them
Frequently asked questions
What is the best month to see bats in Indiana?+
August is the single best month, and the broader peak window runs through August, June and April, based on 576 verified iNaturalist observations.
When are bats hardest to see in Indiana?+
January is the quietest month for bats in Indiana, with only 10 verified records.
Are bats active year-round in Indiana?+
Bats are recorded in 12 of 12 months in Indiana, so they can be seen year-round, with a clear peak in August.
More places to see bats
More wildlife in Indiana