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Warm winter brings early rattlesnake activity to Colorado

Experts say snakes are leaving dens weeks early as warm weather and early prey availability accelerate spring activity.

Summary by 9NEWS Denver
A warmer than usual winter is causing rattlesnakes to emerge earlier than normal, prompting experts to urge caution, but emphasizing that risk to humans remains low.

4 Articles

Center

COLORADO SPRINGS, Colo. (KTLO)--Rattlesnakes are emerging earlier this year, and local experts say we may start seeing them on our mountain trails. Professor Stephen Mackessy, who works for Northern Colorado University and studies rattlesnakes and their venom, says they should typically still be hibernating, but winter never arrived in Colorado, so they're already coming out. He also mentions that rattlesnake deaths are uncommon, with fewer than…

·Colorado Springs, United States
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9NEWS Denver broke the news in Denver, United States on Tuesday, March 31, 2026.
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