Featured amenities
Pet Friendly
About Mammoth Campground (Yellowstone)
Number of accommodations: 81
Nearby Activities & Attractions
Fishing
Seasonal information
2026 Season availability
Campground Amenities
Most popular amenities
Pet friendly
Pets and Policies
- Pet friendly
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Rates, Sites & Availability
81 Sites Available
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Site Details
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81 Sites Available
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Reviews (560)
What Guests Are Saying
Mammoth Campground is praised for its beautiful scenery, convenient location near Lamar Valley, and friendly hosts who maintain a clean environment. Many campers enjoyed the spacious and accessible sites, as well as the wildlife sightings, particularly elk and bison. However, some visitors noted that only one bathroom was open during their stay, leading to inconvenience, and there were occasional issues with campsite reservations. Overall, it's considered a great spot for exploring Yellowstone, especially in the off-season.
What Guests Are Saying
Mammoth Campground is praised for its beautiful scenery, convenient location near Lamar Valley, and friendly hosts who maintain a clean environment. Many campers enjoyed the spacious and accessible sites, as well as the wildlife sightings, particularly elk and bison. However, some visitors noted that only one bathroom was open during their stay, leading to inconvenience, and there were occasional issues with campsite reservations. Overall, it's considered a great spot for exploring Yellowstone, especially in the off-season.
Review Summary
Kelley B
VerifiedMay 3, 2026 • Stayed at: Mammoth site #65, Loop: A
Really nice campground. Convenient location to Lamar Valley. No hook-ups, but we knew that in advance. Our site #65 was level and easy to access with our truck camper. Lots of pull through sites in the campground, which is great.
William M
VerifiedMay 3, 2026 • Stayed at: Mammoth site #46, Loop: B
Thankfully not crowded, full conditions of winter weather. Stayed in camp a couple if days. Hosts were very nice, consciencious individuals. I camp at Mammoth frequently.
Mary Kay S
VerifiedMay 1, 2026 • Stayed at: Mammoth site #12, Loop: A
Easy access to camping spots
Jimmie M
VerifiedMay 1, 2026 • Stayed at: Mammoth site #49, Loop: B
So Beautiful! We loved the campground! And the Hosts were friendly and keep everything up! The Grand Canyon and the Falls are a must! Mammoth Springs too! We drove every road that was open and loved every minute of it!
Paul M
VerifiedApril 29, 2026 • Stayed at: Mammoth site #44, Loop: B
There was only 1 bathroom open near the entrance (hosts) in the entire campground and no warning on rec.gov. The rest of the bathrooms open May 1.
Tyler S
VerifiedApril 28, 2026 • Stayed at: Mammoth site #31, Loop: B
This is only the 2nd time my partner & I have stayed at a NP campground in our 3 years of vanlifing; here and Yosemite.
It was a great last minute decision as we were driving through off season, and I’m so glad we did! There was a lot of wildlife to see in Lamar Valley. And the roads to the geysers had just opened up; so we visited some of the iconic sites with the 1 full day we had.
As for the campground, it was a safe place to sleep & saved us the decline into town! We didn’t use any amenities so I can’t speak to that.
Carine L
VerifiedApril 27, 2026 • Stayed at: Mammoth site #65, Loop: A
Beautiful campground surrounded by sagebrushes and often visited by elks and bisons. The vast majority of sites are small loop sites, not particularly leveled.
Mike H
VerifiedApril 27, 2026 • Stayed at: Mammoth site #53, Loop: B
One of the main issues for almost everybody was that we had to find out the hard way that almost every restroom was closed. This was very, very unexpected by a lot of people. Also, there should be more checking in the campground area by those responsible one night an individual had his truck running with every light on and his spotlight on for over an hour and 10 minutes from eight at night till almost 930 and nobody said a word to him very very rude. Needs to be a little bit more monitoring of the park campground other than that everything was excellent.
Michael D
April 22, 2026
Very easy to check in online. Smooth sailing all the way around. Yellowstone amazing in the Spring, even when cloudy and wet.
Andrew S
VerifiedApril 21, 2026 • Stayed at: Mammoth site #83, Loop: tent
Campground itself is great, the bathrooms were all locked except the ones by the front registration office its .48 mile one way from the back of the Campground to the restroom one way.
Location Mammoth Campground (Yellowstone)
Address:
Yellowstone National Park
Yellowstone, WY, 82190
United States
Latitude & Longitude: 44.9736 / -110.693
Elevation: 1842 feet
Policies & Rules
General
- Mammoth Campground is managed by the park. If you are looking for campgrounds managed by Yellowstone National Park Lodges (Fishing Bridge RV Park, Bridge Bay, Canyon, Madison, and Grant Village campgrounds), please visit the Yellowstone National Park Lodges Camping website.
- RV or Camper Unit Delivery Prohibited. The delivery or pick-up of out-of-park RVs or other camper unit rentals is prohibited.
- Notify the Campground of Late Arrivals. To notify campground of late arrival or cancellation please call 307-344-2289
- Parking. All wheeled vehicles including trailers and motorcycles must be parked on parking pads or established roadways, so as not to block or restrict traffic in campgrounds.
- Camping Occupancy Limits. Maximum occupancy is six people per site. Camp only in designated sites. Camping is limited to 14 days from July 1 through Labor Day and to 30 days the rest of the year parkwide. The 44 day camping limit includes both concession- and park-operated campgrounds.
- Wildlife/Bear Regulations. ~Keep all food and related items - beverages, cooking utensils, stoves, pet food and, empty or full, food and beverage containers such as coolers, ice chests, and water jugs - locked inside your vehicle or stored in a food storage box, unless in immediate use. Bear resistant food containers must be kept in a vehicle, in a hard-sided camping unit, or in a food storage box. ~All trash and garbage must be disposed of in the provided bear-proof trash cans. Do not leave food related trash or garbage unattended. ~Washing dishes or clothing at campground hydrants or spigots is prohibited. Carry all dishwater/wastewater to the restroom toilet for disposal.
- Campfires and Firewood. Wood and charcoal fires are permitted. Campfires are permitted only in established fire grates. Fires must be attended at all times. Only dead, down, and detached wood may be gathered. Wood should not extend outside the fire grate perimeter. Do not break limbs off of standing trees, living or dead. Drown campfires thoroughly with water to make sure they are completely out. NOTE: Wood and charcoal fires may be subject to special restrictions due to fire danger. Restrictions will be listed on campground information boards and on the park's Current Conditions page. Propane grills and stoves are not usually affected by fire restrictions.
- Quiet hours are strictly enforced. No loud audio devices or other noise disturbances will be allowed during this time. Generators are prohibited between the hours of 8:00 p.m. and 8:00 a.m. Generators must be turned off durng the day when campsite is not occupied by site renter.
- Stay on Boardwalks and Trails. All travel in thermal areas is restricted to NPS designated trails and boardwalks.
- Fishing. To fish within the park, people 16 years of age and older are required to purchase and carry on their person a Yellowstone National Park Fishing Permit (you may purchase in advance). To learn more about fishing regulations, visit the park's Catch a Fish web page.
- 30 ft RV limit. From November through April.
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Last updated: June 4, 2026
