Mammoth Campground
Open year-round. Reservations required via Recreation.gov from mid-April through mid-October. First-come, first-served from mid-October through early April with payment via Scan and Pay in the Recreation.gov app. Camping limited to 14 consecutive days from July 1 through Labor Day, and 30 days the rest of the year.
Flood Watch issued September 19 at 1:34AM MDT until September 20 at 6:00PM MDT by NWS Riverton WY
* WHAT...Flash flooding caused by moderate to heavy rainfall is possible, especially in terrain and poor drainage areas. * WHERE...Portions of central, north central, and northwest Wyoming, including the following areas, in central Wyoming, Owl Creek and Bridger Mountains. In north central Wyoming, Bighorn Mountains Southeast, Bighorn Mountains West, Northeast Johnson County and Southeast Johnson County. In northwest Wyoming, Absaroka Mountains, Cody Foothills and Yellowstone National Park. * WHEN...Through Sunday afternoon. * IMPACTS...Excessive rainfall may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas and around steep terrain. * ADDITIONAL DETAILS... - A slow moving weather system will move across Wyoming today through Sunday and bring rounds of showers and thunderstorms to the region, especially northern Wyoming. Any shower or thunderstorm could produce moderate to heavy rainfall across the Watch Area. - http://www.weather.gov/safety/flood
Hydrologic Outlook issued September 18 at 10:20AM MDT by NWS Riverton WY
ESFRIW A wet weather system will support periods of showers and thunderstorms across Wyoming Friday, Saturday, and Sunday. This weather system is funneling abundant tropical moisture into the state. Given this anomalously high moisture, many thunderstorms will feature heavy rainfall, possibly leading to localized flooding. Poor drainage areas, urban areas, and steep terrain will be the most susceptible locations for this isolated flooding. Many locations could see rainfall totals anywhere between 0.75" to 1.75" through Sunday afternoon, with a majority of this rain falling quickly in thunderstorms. Remember, if you encounter a flooded roadway, turn around don't down!
About
Mammoth Campground is uniquely positioned as Yellowstone's only campground open year-round, making it a valuable option for winter visitors and shoulder-season travelers. Located in a high sagebrush steppe at 6,200 feet elevation, the campground provides easy access to the Mammoth Hot Springs terraces, historic Fort Yellowstone, and excellent wildlife viewing throughout the seasons. The 82 standard nonelectric sites accommodate tents and RVs, with some sites fitting combined vehicle lengths up to 75 feet during peak season, though winter limits drop to 30 feet total. Pull-through and back-in sites are available, with limited width for slide-outs and potentially unlevel surfaces. Five ADA-accessible campsites serve visitors with mobility needs. Amenities include flush toilets (year-round, though limited in winter), potable water spigots, dump station, trash and recycling collection, food storage lockers, and seasonal firewood sales. No showers are available on-site, though accessible shower facilities can be found in nearby Gardiner, Montana. Wood and charcoal fires are permitted in fire grates unless fire restrictions are in effect.
Directions
Located in the Mammoth Hot Springs area in the northern section of Yellowstone National Park, five miles south of the North Entrance near Gardiner, Montana.
Amenities
| Water | Yes |
| Fires Allowed | Yes |
| Toilets | Yes |
| Dump Station | Yes |
| Wifi | No |
| Pets Allowed | Yes |
| Showers | No |
| Electric Hookups | — |
| Water Hookups | — |
| Sewer Hookups | — |
| Camp Store | No |
| Price | $25 |
Vehicle
| Max RV Length | 75ft |
| Max Trailer Length | — |
| Big Rig Friendly | No |
| Pull Through Sites | No |
Contact
| YELL_visitor_services@nps.gov | |
| Phone | +1 (307) 344-2289 |
Cell Service
| AT&T | None |
| Verizon | None |
| T-Mobile | None |
Availability
Photos
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