San Diego County’s heat wave is making rattlesnakes more active and visible
By Gary Robbins
Published on March 18, 2026.
San Diego County's nearly week-long heat wave is causing rattlesnakes to become more active and visible, particularly in public parks, on trails, and near homes. The best advice for humans is to leave the snake alone and not to disrupt it. The county recommends that pets should be treated immediately.
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