Colorado Bats Have Begun Autumn Migration

State wildlife officials are advising residents to secure homes as local bat populations transition to winter roosts.

Updated on Oct. 5, 2026 in Wildlife

Screen-print poster illustration showing a bat silhouette over a mountain ridge and roof eave, representing autumnal wildlife migration. — Colorado wildlife officials are advising residents to secure their homes against roosting bats as the species begins its annual autumn migration. AI Illustration. Upload story photo >

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Is now a good time to install one-way exits to humanely exclude bats from your home?

As autumn arrives in Colorado, native bat species have started moving from their summer dwellings in attics and chimney chases toward winter hibernation sites. Colorado Parks and Wildlife suggests that residents utilize this seasonal transition to implement bat-proofing measures for their homes.

Why it matters

Understanding the timing of bat migration is essential for humane wildlife management, as it allows residents to secure their property without harming the animals. Properly managing these roosting sites now ensures that bats successfully reach their natural hibernation habitats like rock crevices.

Bats typically occupy human structures like chimneys and attics throughout the summer months. During the autumn transition, these populations relocate to natural winter hibernation sites including rock crevices.

The players

Colorado Parks and Wildlife

This state agency is responsible for the management and conservation of wildlife resources and public outdoor recreation across Colorado.

The details

Property owners are encouraged to install one-way coverings over identified exit points, which permit bats to leave a structure while preventing them from returning inside. Once the animals have vacated for the season, all remaining openings should be permanently sealed with caulk.

Summer: Bats actively roost within attics and chimney chases.
Autumn: Bats initiate their transition to winter hibernation sites.

Roadmap

This guidance aligns with the standard seasonal shifts observed during the 2026 autumn wildlife migration cycle. The recommendations reflect long-term efforts to manage the intersection of urban residential spaces and native bat habitats.

Residents can proactively bat-proof their homes by installing one-way exit devices during the current transition period. Sealing entry points with caulk after the animals have departed helps ensure a peaceful home environment through the upcoming winter months.

The takeaway

The autumn transition provides a narrow window for homeowners to humanely exclude bats from their property. By acting now, residents can prevent future conflicts while supporting the natural movement of local wildlife.