Bats in Washington: identification guide and where to start looking
Yes, Washington is home to at least 15 bat species. Most common are the big brown bat and little brown myotis. Start your search near water sources like lakes and rivers at dusk during summer months. Look for them emerging from roosts in tree cavities, bridges, or buildings.
Yes, Washington is home to at least 15 bat species. Most common are the big brown bat and little brown myotis. Start your search near water sources like lakes and rivers at dusk during summer months. Look for them emerging from roosts in tree cavities, bridges, or buildings.
1. What are the most common bat species in Washington?
Washington hosts a variety of bat species, but you are most likely to spot the big brown bat (Eptesicus fuscus) and the little brown myotis (Myotis lucifugus). Other frequently seen species include the Yuma myotis, California myotis, and the hoary bat. The big brown bat is larger with a wingspan up to 13 inches, while the little brown myotis is smaller and darker. Both are insectivores and emerge at dusk.
2. Where in Washington are bats most often seen?
Bats are commonly observed near water bodies such as the Puget Sound, Lake Washington, and the Columbia River. They forage over rivers, ponds, and marshes. You may also spot them in forests and urban areas where old buildings or bridges provide roosting spots. Good starting points include Discovery Park in Seattle, the Skagit River area, and the Okanogan National Forest. Check out ourWashington wildlife pagefor more local sighting tips.
3. When is the best time of year or day to see bats in Washington?
The best time to see bats is from late May through early September, when insects are abundant and bat activity peaks. They are crepuscular, so the optimal viewing window is 30 minutes after sunset. Maternity colonies are active in June and July, with pups learning to fly by August. For reliable sightings, visit known roost sites at dusk on a warm, still evening.
See ourstate animal guidefor the next step.
4. How can you identify different bat species in the field?
Key identification markers include size, ear shape, and fur color. The big brown bat has a blunt nose and a wingspan of 12-16 inches, while the little brown myotis has pointed ears and a wingspan of 9-11 inches. The hoary bat is larger with frosted fur, and the pallid bat has large ears and a pale coat. Use a flashlight with a red filter to avoid disturbing them. For more detailed visual guides, visit ourbat identification page.
5. What do bats in Washington eat and where do they roost?
All Washington bats are insectivores, feeding on moths, beetles, flies, and mosquitoes. They roost in tree cavities, under loose bark, in rock crevices, and in man-made structures like attics, barns, and bridges. Some species, like the big brown bat, prefer buildings, while others, like the hoary bat, roost in trees. Maternity roosts can host hundreds of females and are especially common in warm attics during summer.
7. Show your bat appreciation with bat-themed gear
After spotting these amazing creatures, you can celebrate your experience with some bat-themed items. Easy Street Markets offers a variety of bat apparel and accessories for fellow wildlife enthusiasts (without the word!). Check out these top picks:
### Cute Bat Sticker
A perfect way to show your love for bats on laptops, water bottles, or journals.Check Price and Availability
### Bat Animal Short-Sleeve T-Shirt
A comfortable t-shirt featuring a realistic bat graphic. Great for casual wear or field days.Check Price and Availability
### Baby Bat Cartoon T-Shirt
A cute cartoon bat shirt that makes an excellent gift. Soft and stylish.Check Price and Availability
For more options, browse our full collection ofbat t-shirts.
Frequently Asked Questions about bats in Washington
**Are bats in Washington dangerous?** Bats are generally harmless if left alone. They rarely attack and are more afraid of you. However, never handle a bat with bare hands; if you find a grounded bat, contact a wildlife rehabilitator.
**What is the largest bat in Washington?** The hoary bat is the largest, with a wingspan up to 16 inches and distinctive frosted fur.
**Do bats in Washington hibernate?** Yes, many species hibernate in caves, mines, or buildings during winter. The little brown myotis often hibernates in clusters.
**What should I do if a bat gets in my house?** Stay calm and open a window or door to let it fly out. If it doesn't leave, call a professional wildlife removal service.
**Where can I learn more about Washington bats?** Visit ourbat species guideand check the Washington Department of Fish and Wildlife for local resources.
See ourtour planning ideasfor the next step.