California Bats in Spring: Emerging and Returning
I remember the excitement of seeing the first bats emerge from their winter roosts in the Central Valley. Spring is a time of renewal for California's bat populations, as they wake up from hibernation or return from southern migrations to start their active year. For more on these amazing flyers, check our [California bat](/wildlife/california/bat) trunk page or see the [best time to see bats in California](/wildlife/california/bat/best-time).
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 1, 2026.
- 3
- species recorded
- July, August, September
- peak months
Real sighting data, source iNaturalist
7,270 verified observations on iNaturalist of bat have been recorded in California, most often in July, August, September.
I remember the excitement of seeing the first bats emerge from their winter roosts in the Central Valley. Spring is a time of renewal for California's bat populations, as they wake up from hibernation or return from southern migrations to start their active year. For more on these amazing flyers, check ourCalifornia battrunk page or see thebest time to see bats in California.
When do bats wake up in California?
Most bats begin to emerge in March and April as the weather warms. This timing coincides with the return of their primary food source: flying insects. It is a busy time as they regain their strength after a long rest.
Where do they roost in the spring?
They often use bridges, caves, and even abandoned buildings as temporary spring roosts. You can find specific locations in ourwhere to see bats in Californiaguide. These spots provide the safety they need during the day.
What are they hunting for in May?
They are hunting for early spring insects like beetles and moths. Their activity levels increase significantly as the insect population grows, providing the energy they need for the upcoming breeding season.
Which species are most active in the spring?
The Mexican Free-tailed Bat and the Canyon Bat are among the first to be seen in large numbers. As spring turns to summer, you can follow theirpeak season flightsor look back at theirwinter hibernation.
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Frequently asked questions
When do bats wake up in California?+
Most bats begin to emerge in March and April as the weather warms. This timing coincides with the return of their primary food source: flying insects. It is a busy time as they regain their strength after a long rest.
Where do they roost in the spring?+
They often use bridges, caves, and even abandoned buildings as temporary spring roosts. You can find specific locations in ourwhere to see bats in Californiaguide. These spots provide the safety they need during the day.
What are they hunting for in May?+
They are hunting for early spring insects like beetles and moths. Their activity levels increase significantly as the insect population grows, providing the energy they need for the upcoming breeding season.
Which species are most active in the spring?+
The Mexican Free-tailed Bat and the Canyon Bat are among the first to be seen in large numbers. As spring turns to summer, you can follow theirpeak season flightsor look back at theirwinter hibernation.
Keep exploring
More places to see bat
More wildlife in California
Common questions about bats