Bats in Washington in September
Yes, September is one of the best months to see bats in Washington. It is the 3rd busiest month of the year, with 116 of the 953 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.
Peak month for bats in Washington
12.2%
of yearly sightings
116
records in September
#3
busiest month of 12
953
verified records a year
August 21.9%, September 12.2%, October 4.2%. Busiest month is August at 21.9%.
953 verified observations of bats in Washington, recorded across 12 months of the year on iNaturalist.
When bats are recorded in Washington
Peak month
August
209 records (21.9% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 25 | 2.6% |
| February | 29 | 3% |
| March | 58 | 6.1% |
| April | 85 | 8.9% |
| May | 95 | 10% |
| June | 111 | 11.6% |
| Julypeak | 138 | 14.5% |
| Augustpeak | 209 | 21.9% |
| Septemberpeak | 116 | 12.2% |
| October | 40 | 4.2% |
| November | 28 | 2.9% |
| December | 19 | 2% |
Bats you are most likely to see
| Species | Verified observations |
|---|---|
| Little Brown Bat | 77 |
| Silver-haired Bat | 70 |
| Big Brown Bat | 64 |
| Townsend's Big-eared Bat | 53 |
| California Myotis | 37 |
| Long-eared Myotis | 26 |
| Yuma Myotis | 15 |
| Northern Hoary Bat | 11 |
In Washington, 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 3rd busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from August (21.9%) into September, and it heads toward October (4.2%) after. This is right inside the peak window, so September is one of the surest months to plan a trip around.
The bats most often recorded in Washington are Little Brown Bat, Silver-haired Bat and Big Brown 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
- Little Brown Bat77 records
- Silver-haired Bat70 records
- Big Brown Bat64 records
- Townsend's Big-eared Bat53 records
- California Myotis37 records
- Long-eared Myotis26 records
Plan your bat trip in Washington
Start with live tours near Ebey's Landing National Historical Reserve, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Ebey's Landing National Historical Reserve
Use the live GetYourGuide widget to compare local departures and activity styles close to the main bat viewing area.
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Stay nearbyStay near Ebey's Landing National Historical Reserve
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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 Washington in September?+
Yes. September accounts for 116 of the 953 verified bats sightings logged in Washington across the year, which is 12.2% of the annual total.
Is September a good time to see bats in Washington?+
September is one of the best months. It ranks 3rd of the year and sits inside the peak window of August, July and September.
What month is best for bats in Washington?+
August is the single busiest month, with the broader peak running through August, July and September, based on 953 verified observations.
Which bats are you most likely to see in Washington?+
The most-recorded species in Washington are Little Brown Bat, Silver-haired Bat and Big Brown Bat, based on all-time iNaturalist counts.
See bats in Washington in other months
More places to see bats
More wildlife in Washington