National Park
Yellowstone National Park
Regulations on 31 October 2026
Signs at the site and later resolutions prevail; check the source.
These hold everywhere inside the boundary, whether or not a site is marked.
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Permit required
Caving · All year
In force on 31 October 2026
All caves within the park are closed to public use, except when a permit has been issued by the Superintendent.
Published by National Park Service, 17 Sept 2026 · Yellowstone National Park Superintendent’s Compendium, September 2026
Regulated sites
1 site · Regulations on 31 October 2026