Best Time to See Bats in Delaware
April, July and June is the best time to see bats in Delaware. Based on 86 verified iNaturalist observations, here is exactly when bats are most active across the year in Delaware.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Big Brown Bat · Joe Francis CC BY
Eastern Red Bat · inbetweenbays CC BY
Eastern Red Bat · Public domain CC0
86 verified observations of bats in Delaware, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Delaware
Peak month
April
12 records (14% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 5 | 5.8% |
| February | 3 | 3.5% |
| March | 2 | 2.3% |
| Aprilpeak | 12 | 14% |
| May | 10 | 11.6% |
| Junepeak | 11 | 12.8% |
| Julypeak | 12 | 14% |
| August | 11 | 12.8% |
| September | 6 | 7% |
| October | 6 | 7% |
| November | 7 | 8.1% |
| December | 1 | 1.2% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Eastern Red Bat | 30 |
| Big Brown Bat | 20 |
| Silver-haired Bat | 6 |
| Mouse-eared Bats | 1 |
Weather to expect, source Open-Meteo
Typical weather in Delaware
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 48 to 86 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 44°F | 32°F | 2.9" |
| Feb | 47°F | 33°F | 3.8" |
| Mar | 54°F | 39°F | 3.8" |
| Aprbest time | 63°F | 48°F | 4.5" |
| May | 70°F | 56°F | 3.9" |
| Junbest time | 79°F | 66°F | 3.9" |
| Julbest time | 86°F | 73°F | 6" |
| Aug | 83°F | 72°F | 5.1" |
| Sep | 77°F | 65°F | 4.3" |
| Oct | 68°F | 55°F | 4.4" |
| Nov | 56°F | 43°F | 2.8" |
| Dec | 48°F | 36°F | 4.8" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Delaware. Weather varies year to year, so treat these as a guide.
More on bats in Delaware:
Sightings of bats in Delaware peak in April, when 12 of the year's 86 verified observations are logged — about 14% of the annual total. Activity stays high through April, July and June.
The quietest stretch is December, when bats are hardest to find — December 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 Delaware are Eastern Red Bat, Big 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 Delaware
- Captain John Smith Chesapeake National Historic Trail — National Historic Trail
- Chesapeake Bay
- First State National Historical Park — National Historical Park
- Washington-Rochambeau Revolutionary Route National Historic Trail — National Historic Trail
Gear to see them
Frequently asked questions
What is the best month to see bats in Delaware?+
April is the single best month, and the broader peak window runs through April, July and June, based on 86 verified iNaturalist observations.
When are bats hardest to see in Delaware?+
December is the quietest month for bats in Delaware, with only 1 verified records.
Are bats active year-round in Delaware?+
Bats are recorded in 12 of 12 months in Delaware, so they can be seen year-round, with a clear peak in April.
More places to see bats
More wildlife in Delaware