Mammoth Campground (Yellowstone) opening date & reservations
- Managed by
- National Park Service: Yellowstone National Park
- State
- Wyoming
- Opens
- —
- Closes
- Oct 16, 2026
- Season notes
- Recreation.gov: Starting Tuesday April 15th, the Mammoth Campground is open and reservations are required.
- Status
- Closed for the season
- Reservations
- Recreation.gov
- Booking window
- Not listed on source page
- Source
- Official page (checked 2026-10-17)
- Last verified
- Oct 18, 2026 against the Recreation.gov availability calendar
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