Pick a site on the map to see its availability calendar.
No strong weekday pattern is evident in the openings Campsite Sniper has detected: 961 openings spread across the week.
The largest concentrations of detected openings were first detected during the 06:00 and 11:00 local-time hours. Those hours contained 403 of 961 detected openings (41.9%). Hours show when Campsite Sniper first detected each opening, in Mountain Time, not when the change was made upstream.
Half of the openings Campsite Sniper detected appeared at least 8 days before the stay date; the middle 50% land 3–14 days out. Set an alert if you want Campsite Sniper to monitor future openings.
| Site | Openings | Share of all openings |
|---|---|---|
| Mammoth site #38 | 23 | 2.4% |
| Mammoth site #2 | 22 | 2.3% |
| Mammoth site #3 | 21 | 2.2% |
| Mammoth site #21 | 21 | 2.2% |
| Mammoth site #29 | 21 | 2.2% |
Site Mammoth site #38 had the most detected openings in the last 90 days: 23. One free watch covers every site here.
Of the 14,823 tracked site-nights (Nov 2, 2026 – May 3, 2027): 366 open for online reservation · 276 reserved · 6,270 on sites not offered for online reservation (first-come, first-served or administrative) · 7,740 closed · 171 not yet released.
Of the open site-nights on mapped sites, 162 fall on weekdays and 204 on weekends (Fri–Sun).
November shows no online availability. 0 of 2,349 tracked site-nights are open there — 1,102 on sites not offered online, 1,247 closed.
| Window | Night | Sites open | Status |
|---|---|---|---|
| Thanksgiving | THU Nov 26 | 0 | None open |
| FRI Nov 27 | 0 | None open | |
| SAT Nov 28 | 0 | None open | |
| Christmas | THU Dec 24 | 0 | None open |
| FRI Dec 25 | 0 | None open | |
| New Year | THU Dec 31 | 0 | None open |
| FRI Jan 1 | 0 | None open | |
| Memorial Day | FRI May 28 | 0 | None open |
| SAT May 29 | 0 | None open | |
| SUN May 30 | 0 | None open | |
| MON May 31 | 0 | None open |
Thanksgiving: no online availability on any tracked night. Christmas: no online availability on any tracked night. New Year: no online availability on any tracked night. Memorial Day: no online availability on any tracked night.
| Site | Open site-nights |
|---|---|
| Mammoth site #15 | 18 |
| Mammoth site #19 | 18 |
| Mammoth site #3 | 18 |
| Mammoth site #66 | 18 |
| Mammoth site #68 | 18 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
The next bookable night is Apr 16, 2027; the first open weekend starts Apr 16, 2027. Campsite Sniper can watch later dates for you.
Multi-night stays. 54 2-night, 52 3-night, 18 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Apr 16, 2027 at site Mammoth site #15.
RV length. Longest recorded site here is 99 ft. 78 sites take 25 ft, 72 sites take 35 ft, 70 sites take 40 ft.
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| Mammoth site #15 | 40 ft | None | 18 | 18 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +6 more |
| Mammoth site #19 | 56 ft | None | 18 | 18 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +6 more |
| Mammoth site #3 | 52 ft | None | 18 | 18 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +6 more |
| Mammoth site #66 | 41 ft | None | 18 | 18 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +6 more |
| Mammoth site #68 | 45 ft | None | 18 | 18 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +6 more |
| Mammoth site #7 | 60 ft | None | 16 | 12 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +4 more |
| Mammoth site #5 | 68 ft | None | 15 | 15 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +3 more |
| Mammoth site #6 | 60 ft | None | 15 | 13 nights | Apr 16, 2027, Apr 17, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027 +3 more |
| Mammoth site #9 | 62 ft | None | 15 | 15 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +3 more |
| Mammoth site #11 | 55 ft | None | 14 | 13 nights | Apr 16, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027, Apr 28, 2027, Apr 29, 2027, Apr 30, 2027, May 1, 2027 +2 more |
| Mammoth site #61 | 51 ft | None | 14 | 10 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 30, 2027, May 1, 2027 +2 more |
| Mammoth site #65 | 60 ft | None | 14 | 13 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +2 more |
| Mammoth site #18 | 60 ft | None | 13 | 13 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 +1 more |
| Mammoth site #12 | 53 ft | None | 12 | 12 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027, Apr 27, 2027 |
| Mammoth site #60 | 60 ft | None | 11 | 10 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 30, 2027 |
| Mammoth site #13 | 50 ft | None | 10 | 10 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027 |
| Mammoth site #17 | 37 ft | None | 10 | 10 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027 |
| Mammoth site #57 | 60 ft | None | 8 | 8 nights | Apr 19, 2027, Apr 20, 2027, Apr 21, 2027, Apr 22, 2027, Apr 23, 2027, Apr 24, 2027, Apr 25, 2027, Apr 26, 2027 |
| Mammoth site #25 | 58 ft | None | 6 | 4 nights | Apr 16, 2027, Apr 17, 2027, Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #54 | 60 ft | None | 6 | 5 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, May 3, 2027 |
| Mammoth site #62 | 65 ft | None | 6 | 6 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027, Apr 21, 2027 |
| Mammoth site #14 | 66 ft | None | 5 | 5 nights | Apr 16, 2027, Apr 17, 2027, Apr 18, 2027, Apr 19, 2027, Apr 20, 2027 |
| Mammoth site #23 | 96 ft | None | 4 | 4 nights | Apr 30, 2027, May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #26 | 58 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #27 | 58 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #30 | 99 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #31 | 48 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #32 | 58 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #33 | 61 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #36 | 46 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #38 | 56 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #40 | 57 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #42 | 62 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #48 | 56 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #50 | 55 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #52 | 55 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #53 | 58 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #69 | 33 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #71 | 48 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #74 | 50 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #75 | 48 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #76 | 42 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #77 | 22 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #78 | 20 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #79 | 24 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #80 | 30 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #81 | 50 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #82 | 40 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #83 | 50 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #85 | 46 ft | None | 3 | 3 nights | May 1, 2027, May 2, 2027, May 3, 2027 |
| Mammoth site #24 | 60 ft | None | 1 | 1 night | Apr 30, 2027 |
Starting Tuesday April 15th, the Mammoth Campground is open and reservations are required.
For reservations at the 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.
There are many recreational opportunities in the Mammoth Hot Springs and the North area. Visit these pages to learn more:
Boating
Fishing
Hiking
Photography & Wildlife Watching
Explore the boardwalks above Mammoth Hot Springs to view the the steaming Hydrothermal Features or take a drive around the vibrant travertine terraces.
Explore in Winter. Ski or snowshoe among the whiffs of sulfur along the Upper Terraces.
Explore the historic Fort Yellowstone area.
Visit the park's Mammoth & Hot Springs North web page to learn more.
Mammoth Campground offers:
82 campsites Some Cell Phone Reception Food Storage Lockers Trash/Recycling Collection Amphitheater - Seasonal Staff or Volunteer Host On Site - Seasonal Potable Water spigots Flush Toilets - year round
There are no showers at the campground
The Mammoth Campground is in a high sagebrush steppe, scattered juniper and Douglas fir trees provide shade during hot summer months. Wildlife including elk, bison, pronghorn, and mule deer frequent the Mammoth Hot Springs and the North area of the park, depending on the season.
The road from the North Entrance to the Mammoth Campground winds up the Gardner River canyon, past crumbling walls of sandstone and ancient mudflows. The vegetation is much thicker in the canyon than on the open prairie down below, the common trees being Rocky Mountain juniper, cottonwood, and Douglas-fir. Low-growing willows also crowd the river's edge in the flatter, flood-prone sections of the canyon. Watch for wildlife, which varies by the season. Eagles, osprey, dippers, and kingfishers can be spotted along the river, while bighorn sheep climb along the steeper parts of the canyon. Elk are common in Mammoth Hot Springs, while bison can often been seen along the road out to Tower–Roosevelt.
Spring and Fall daytime temperatures range from 30°F (-1°C) to 60°F (15°C) with overnight lows in the teens to single digits. Snow is common in the spring and fall. Summer temperatures are often around 70°F (21°) to 80°F (27°C) and occasionally 90°F (32°F) at lower elevations. Nights are usually cool and temperatures may drop below freezing at higher elevations. Thunderstorms are common in the afternoons. During winter, sub-zero temperatures and snow are common, especially at night and at higher elevations. Winter temperatures range from 0—20°F (-20—-5°C) throughout the day, with sub-zero temperatures overnight.
The Mammoth Campground is located in the Mammoth Hot Springs area in the Northen section of the park, five miles from the park's North Entrance near Gardiner, MT. Visit the park's website for more information including directions and maps: https://www.nps.gov/yell/planyourvisit/directions.htm
View on Recreation.gov ↗ Get directions ↗












Reservations for Mammoth Campground (Yellowstone) are made through Recreation.gov. 97.5% of tracked site-nights are not currently open for online reservation; 366 of 14,823 remain open. Campsite Sniper has also detected 961 site openings here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Nov 2, 2026 17:20 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
Campsite Sniper detected 961 site-date openings here over the last 90 days, none in the last 7. A free alert watches around the clock and pings you the moment one appears.
52 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Apr 16, 2027 at site Mammoth site #15. Confirm and book on Recreation.gov.
72 of the 81 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 99 ft.
April 2027, with 250 open site-nights in the current snapshot of 2,430.
Half of the openings Campsite Sniper detected appeared at least 8 days before the stay date; the middle 50% landed 3-14 days out. Campsite Sniper can monitor future changes for dates you select.
As of the Nov 2, 2026 snapshot: the next open date is Fri, Apr 16, 2027 and the next open weekend starts Fri, Apr 16, 2027. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
We run paced availability checks for Mammoth Campground (Yellowstone). One watch covers every matching site.
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.