From March to July each year, Devils Tower is for the birds. Technically, the birds can hit up the phonolite porphyry (aka igneous) monolith any month of the year. But for these three months during the nesting season for prairie and peregrine falcons, climbing some routes is strictly verboten.
Park rangers monitor nest locations, so route closures vary from year to year.
In addition to the mandatory closures, park staff requests a voluntary climbing ban for the entire month of June. This is a self-regulated ban implemented out of respect for the local indigenous tribes, for whom Devils Tower is a sacred site.
The voluntary stoppage is a solution the Park Service has adopted to respect both Native American reverence for the site and recreational uses. For more information, the Park Service has posted an educational brief online. Note that it’s specifically stated that The Access Fund supports both the mandatory and the voluntary closures.
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