Mammoth Campground

We were there mid to late October. While there are no hookups, we did like the heated rest rooms with flush toilets, hot running water, and electric plugs (we used our inverter but saw several times that folks were charging their phones in the restrooms). We were arriving on a Saturday, so we got in line at the entrance at 5:55. There were 3 rigs ahead of us and many came after. The rangers started processing site assignments at 7am. We were assigned a site a little before 8am. The pull-thru site made setting up quick, which was nice since it was 26 degrees outside.
We liked the proximity to Lamar Valley, and drove it many times. Saw bear, bison, pronghorn, an eagle, coyotes and wolves. Even saw coyotes with a bison kill. On one of the days that had snow, we enjoyed a drive through Lamar Valley to Cooke City. Great burgers at the Bistro Cafe. The scenery heading out of the park and on the way to Cooke City is spectacular and worth the drive.

We also drove to the Grand Canyon, Old Faithful and Midway Geyser basin from Mammoth, although they are easier reached from other campgrounds in the park (but they were all closed for the winter).

There was no cell coverage in the campground, but a short drive toward Gardner brought us in range, at a large pullout before the entrance gate. Added benefit, we saw bighorn sheep along the way! The campground is near the main highway, but I was surprised that the road noise was no bother. Of course, with the winter temperatures and being on the go most of the time, we didn’t sit outside. We did go through propane, and refilled our tanks at the Sinclair station just outside the northern edge of Gardner. All the dump stations in the park were closed for the winter—before arriving we used the dump station at Grizzly RV Park in West Yellowstone. We had hoped to use them again when we left Mammoth, but they were closed. We were driving south into Idaho so we used the dump station 95 miles south in Rigsby at Bob’s Kwik Service.

The elk herd that stays around Mammoth headquarters/store did come down to the campground one day, fun to see (keeping a distance). Another day a large bull elk with 2 females across the road did an impressive display of bugling, countered by another bull up behind us.

Many of the days we were at Mammoth were snow days, and park staff worked quickly to clear the roads. Finally the weather predictions were for -10 degrees in a couple days, and it was time to head south! By the time we left, the campground had only about four occupants.

When we arrived at 9 am on a Wednesday in mid-September, we were 3rd in line for an RV campsite, 6th overall. The campground filled by 11 am. Since it is a walk-in campground, you do need to arrive early, as the rangers keep track of your spot in line and campsites are assigned in order of arrival as the sites are vacated.

The campground is close to Mammoth Hot Springs and the Albright Visitors Center where there is free WiFi available (tip: for best WiFi speed, sit on the front porch of the Visitors Center after closing time). There are plenty of threaded water spigots around the campground (but no dump station — we dumped at Yellowstone RV Park in Gardiner, MT). Cell service was 3 bars Union - US Telephone 3G, but we didn’t get to use it much because of the roaming limit we have on our cell plan.

We were assigned a pull-through site, #12 (I think all sites are pull-throughs) right next to the highway. Other than the road noise, it was a pretty nice site with lots of sun for the solar panel. There was a lot of low brush between campsites, which was nice for a bit of privacy, and we were right next to a threaded potable water spigot. The sites are fairly level and it is pretty easy to get in and out of the campground.

We really liked our time here. All the campsites are pull through with great views of Lava valley. We had elk in the campground daily. All the bathrooms were very clean and whole campground is well maintained. It did fill up daily. Every morning at about 8 a line starts to form which doesn’t make sense because check out isn’t until 10. If you have to be in this place then get here around 10. Otherwise you could probably push it to noon or so but then it is probably going to be close.

The Mammoth Springs Lodge has excellent showers you can use that cost $5. Campground is a short steep hike to Visitor Center and Mammoth Springs.

Cell phone is pretty reliable on Verizon but does tend to drop unexpectedly. ATT doesn’t exist.

Mammoth is the best (and only) option for year-round camping in the park. For this reason, it is my go-to for camping on opening weekend and closing weekend each year. Camp can fill up quickly once the park roads open in spring and close in the fall so arrive early to secure a site. During the off season its not unusual for only one bathroom to be open. Almost all of the sites are level and are pull through, large enough for most RVs. Fire rings, tent pads and tables at each site. Flush toilets and water taps throughout camp. Firewood vending machine is available if needed. If the camp host is on duty to check you in you can ask to drive around and preview the sites before they assign one to you. While your fellow campers are generally quiet and respectful the location of the camp tends to be pretty noisy since the park road is routed around the camp. Be prepared to listen to park employees starting out their day driving by at 5am - snow plows, garbage trucks, etc. Lots of traffic noise all night.
And, if you're here in the fall, you'll get to listen to the bull elk bugling all night long. I'd rather listen to them than trucks any day!

This place fills up fast even in October we stayed here 10-2-18 we want to soak in the boiling river, we did all day long it was great ! the best spots are on the outer rim try for 42 through 49. No showers but they have flush toilets, portable water and trash. Gardiner is close by they have a good pizza place Yellowstone pizza company we eat there twice and if you are looking for free WiFi go to the library in Gardiner and park at the park its right across the street you don't even have to get out of your car.

Located just inside the north entrance, the Mammoth Campground offers outstanding views in a dry, desert-influenced environment. The relative absence of trees made it easy for us to rely exclusively on solar power throughout our visit. We were here during September with high temperatures in the 70s, so we didn’t mind the absence of shade – but this area could be really hot in summer. Mammoth is an outstanding base to explore the northeastern portion of the park, including the Lamar Valley.

Mammoth is a first-come, first-serve campground but with one of the most organized check-in procedures we’ve ever encountered for a campground of this type. Incoming campers parked in designated lanes and were assigned campsites that would work for their rigs as sites became available. We stayed here in the weeks after Labor Day, and the lines started forming around 7 a.m. just about every day, with the line stretching out to the road by 8:30.

We love having wide open views, and really liked the layout of the campground in one long loop along the hillside, which provided good site separation. Both the upper and lower sides of the loop have excellent views across the valley to Mt. Everts. The sites numbered about 29 to 49 on the outside of the loop have particularly good views down the long valley toward Gardiner, but we found that end of the campground had no service on AT&T. We had 2 bars 4G in our site (65) and the sites on the southern end of the campground (the lowest and highest numbers) had the best signal for AT&T. However, the tower was so overloaded after about 8 a.m. that it was worthless during the day. If you need data access, plan to drive the 5 miles toward Gardiner. There is excellent service in town and also in the last several pullouts within the park that are within sight of Gardiner.

The layout of the campground lends itself to privacy since campers are strung out in a long line in two tiers, but it is within a switchback on the main park road so there is definitely traffic and road noise. For us, the road noise during the day – which was virtually nonexistent at night – was a fine tradeoff for the convenience of the location and the great views. Our site was very long and generally level, which was a nice surprise for a campground located on a hill.

There is a walking trail up the hill connecting the campground to the town of Mammoth Hot Springs, where there is a visitor center in one of the historic buildings, restaurants, a general store, a gas station, and of course the huge travertine terraces created by the hot springs. There are also several trailheads within walking distance of the campground. The Lava Creek trail starts across the main road and is used more by fishermen than hikers. One end of the Beaver Ponds Loop is located right behind the hotel.

Mammoth is home to a herd of elk, so be prepared to see elk traversing the campground as they head up or down the hill. We were inundated by elk during our visit in September, with groups of cows and calves in our campsite and feeding throughout the campground, especially in the mornings. The bulls also visited and we heard bugling every night.

Outside of being busy, the biggest issues with Mammoth are that the campground does not have showers, and also does not have a dump station. We ended up stopping at Canyon during our drives around the park to use their pay showers since we were stretching our tanks for an 11-night stay.

The sites are pretty large - we could have fit two Airstream and the truck in our spot. Everything is a pull through and dry camping, but not overly crowded. After staying at the Fishing Bridge RV Park this place felt roomy.

Supposedly had 4 bars of 4G, but it was pretty unstable and slightly frustrating. Sam had to drive out to the top of the hill one morning for a work meeting.

Definitely a beautiful area of the park, and the Elk wander the campground freely.