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Mammoth Campground

Updated October 30, 2026. Based on Recreation.gov and National Park Service records. Published by Humblebee.

Campsites
81[1]
Nightly fee from
$25[2]
Reservations
Yes[3]
Longest RV or trailer
33 ft[4]

Mammoth Campground is run by the National Park Service in Yellowstone National Park, Wyoming[5]. Recreation.gov lists 81 overnight campsites and says it can be reserved there[1][3].

What to expect

Recreation.gov describes the setting as high sagebrush steppe with scattered juniper and Douglas fir trees[6]. NPS lists the campground as open year-round, with part of it closed mid-October through April[7]. The NPS note says booking is required from early April to mid-October, then sites go to walk-ups from mid-October to late March[8]. Individual sites can be reserved up to six months ahead[8]. All 81 sites are drive-in, and 81 accept a tent while 59 accept an RV or trailer[9][10]. The longest RV or trailer length allowed at any site is 33 feet[4]. Recreation.gov lists no electric, water or sewer hookups at any of the 81 sites[11].

Campsite details

From Recreation.gov campsite records. Details can change, so check the listing before you book.

Detail Value
Campsites[1] 81
Site types[1] 81 standard nonelectric
Sites (NPS count)[12] 85, 85 reservable, 0 first come, first served
Reservations[3] Yes, on Recreation.gov
Accessible sites[13] 5
Hookups[11] electric 0, water 0, sewer 0 sites
Longest RV or trailer[4] 33 ft (median 33 ft)
Equipment[10] RV or trailer at 59 sites, tent at 81 sites
Pets[14] Allowed at all listed sites
Campfires[15] Allowed at all listed sites
Check-in[16] 10:00 AM
Check-out[17] 10:00 AM
People per site[18] 6

Camping fees

Nightly fees listed by the National Park Service. Fees can change by season.

Site or fee Per night
Nightly Fee[2] $25

Amenities

Before you go

Questions people ask

How much does Mammoth Campground cost per night?
Recreation.gov lists $25 per night per site[20]. NPS notes a 50% discount for holders of the Interagency Access and Senior passes[2].
Can you reserve a site at Mammoth Campground?
Yes, it can be reserved on Recreation.gov[3]. NPS says sites can be booked up to six months in advance[8].
Does Mammoth Campground have hookups?
Recreation.gov site details list 0 sites with electric, water or sewer hookups out of 81 campsites[11].
How long an RV can Mammoth Campground take?
Recreation.gov lists a longest allowed RV or trailer length of 33 feet at any site[4].
Are dogs and campfires allowed at Mammoth Campground?
Recreation.gov site details say pets are allowed at all 81 campsites with this detail listed[14]. Campfires are listed as allowed, and fire restrictions can apply at any time[15].

Facts and sources

  1. Recreation.gov lists 81 overnight campsites at Mammoth Campground: 81 standard nonelectric. Recreation.gov (RIDB)
  2. Camping fee, Nightly Fee: $25 per night. National Park Service
  3. Mammoth Campground can be reserved on Recreation.gov. Recreation.gov (RIDB)
  4. Longest RV or trailer length allowed at any site at Mammoth Campground: 33 feet (median across sites with a listed limit: 33 feet). Recreation.gov (RIDB)
  5. Mammoth Campground is a campground managed by the National Park Service in Yellowstone National Park, Wyoming. Recreation.gov (RIDB)
  6. Recreation.gov description for Mammoth Campground. Recreation.gov (RIDB)
  7. Season and hours (NPS): Mammoth Campground is typically open year-round, though part of the campground is closed mid-October through April. Reservation-only 4/15-10/15. Checkout time is 10 am. National Park Service
  8. Reservation note from NPS: Sites are reservation-only from early April to mid-October and first-come, first-served from mid-October to late March on Recreation.gov. Individual campsites at this campground can be reserved up to six months in advance.... National Park Service
  9. Site access types at Mammoth Campground: Drive-In 81 sites. Recreation.gov (RIDB)
  10. Permitted equipment at Mammoth Campground: 59 sites accept an RV or trailer and 81 accept a tent. Recreation.gov (RIDB)
  11. Hookups at Mammoth Campground per Recreation.gov site details: 0 sites with electric hookups, 0 with water hookups, 0 with sewer hookups, out of 81 campsites. Recreation.gov (RIDB)
  12. NPS lists 85 sites at Mammoth Campground: 85 reservable and 0 first come, first served. National Park Service
  13. 5 of the 81 campsites at Mammoth Campground are marked accessible on Recreation.gov. Recreation.gov (RIDB)
  14. Pets allowed per Recreation.gov site details at Mammoth Campground: yes at all 81 campsites with this detail listed. Recreation.gov (RIDB)
  15. Campfires allowed per Recreation.gov site details at Mammoth Campground: yes at all 1 campsites with this detail listed. Fire restrictions can apply at any time. Recreation.gov (RIDB)
  16. Check-in time at Mammoth Campground on Recreation.gov: 10:00 AM. Recreation.gov (RIDB)
  17. Check-out time at Mammoth Campground on Recreation.gov: 10:00 AM. Recreation.gov (RIDB)
  18. Maximum people per campsite at Mammoth Campground: 6 at most sites (range 6 to 6). Recreation.gov (RIDB)
  19. Amenities at Mammoth Campground listed by NPS: toilets: Flush Toilets - year round; showers: None; drinking water: Yes - year round; dump station: No; cell reception: Yes - year round; camp store: No; firewood for sale: Yes - seasonal; food storage... National Park Service
  20. Fee information on Recreation.gov: The camping fee in Mammoth Campground is $25 per night per site. Recreation.gov (RIDB)
  21. NPS campground rules for Mammoth Campground. National Park Service

Site details come from Recreation.gov campsite records. They can lag behind changes on the ground. Fees change by season and site type. Quote only fee facts and say they can change. Description and rules facts are sources for facts only: retell in your own words, never copy 8 or more words in a row. Hookup, pet and campfire counts are per listed campsite record, not a promise for every site.

Campsite data: Recreation Information Database (RIDB), Recreation.gov, licensed under CC BY 4.0. Not endorsed by Recreation.gov or any agency.