Campgrounds / Yellowstone National Park

Mammoth Campground

Yellowstone National Park, WY. Every number below is quoted from the official page named beside it, retrieved 2026-10-17. "Not stated" means the page does not say.

The calculator link pre-fills the driveway at the facility maximum. A facility maximum is the longest unit the campground accepts somewhere, not the length of every site; the site page on Recreation.gov carries the site's own figure where one exists.

Spec sheet

Park

Yellowstone National Park, WY

Sites

82 National Park Service, Yellowstone: Camping

Elevation

not stated

Season

Open year-round, as listed in the park's camping table. First-come, first-served sites October 15 – April 1. National Park Service, Yellowstone: Camping

Hookups

The park's camping table marks RV hookups as not available at this campground. National Park Service, Yellowstone: Camping

Dump station

not stated

Loops

not stated

Site types listed

not stated

Reservation window

not stated National Park Service, Yellowstone: Camping

Access notes

The figure recorded here is the 30 ft winter limit printed in the table's length column. The table's own footnote states a 45 ft limit from May through mid-October, so the applicable figure depends on when you arrive; read the park page before relying on either. The table marks generators as allowed and no dump station. National Park Service, Yellowstone: Camping

What the limit means for your rig

Mammoth Campground publishes a combined limit of 30 ft: the RV plus any towed or towing vehicle, measured end to end. That is the number the fit calculator computes as "combined length", so compare like with like — and it is a stricter test than an RV figure of the same number, a 30 ft motorhome towing a car is outside this limit, while the same motorhome is inside a 30 ft maximum RV length somewhere else. The exact wording is quoted under the diagram; read it, because a facility maximum is the longest unit the campground accepts somewhere and not the length of every site.

A 35-foot rig is the size at which figures like this start to bind, and a combined figure binds sooner than an RV figure does: Mammoth Campground's 30 ft combined limit rules out a 35-foot motorhome on its own, before you add a towed car. How a 35-foot rig reads against every limit verified on this site, RV figures and trailer figures separated.

Use the calculator with the driveway set to 30 ft to see your rig drawn to scale against this limit. A "fits" there means your rig is inside the facility maximum with the 5 ft safety margin, which is our editorial assumption and not a figure from any source — it is editable in the calculator, down to zero. A "fits" does not mean a particular site is available or that every site is that long.

Hookups at Mammoth Campground

Official wording: "The park's camping table marks RV hookups as not available at this campground." There is no electricity, water or sewer at the site, so plan on battery, generator rules as stated above, and the dump station named in the spec sheet.

Other verified campgrounds

• Fishing Bridge RV ParkYellowstone National Park95 ft combined
• Bridge Bay CampgroundYellowstone National Park60 ft combined
• Canyon CampgroundYellowstone National Park40 ft combined
• Grant Village CampgroundYellowstone National Park50 ft combined
• Madison CampgroundYellowstone National Park60 ft combined

Provenance

No campsite-level records (driveway length per site, per-site hookups, accessibility attributes) are published here yet: they come from the RIDB API, which needs a key this site does not have configured. See methodology.