As long as the hibernating colony of bats shows no signs of disturbance, we plan to keep over half of the Bear Gulch Cave open for almost ten months each year, from mid-July through mid-May. During especially warm springs, however, it's possible that the entire cave will be closed before mid-May if the maternity colony is present. Status of the Caves - Pinnacles National Park (U.S. National Park Service)
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