Yellowstone in December.

Crowd snapshot.

December averages about 34,000 recreation visits, near 4% of July's peak. The first two weeks track November's near-empty baseline. The December 15 oversnow opening lifts volume in the second half, especially over the holidays, when the winter lodges run essentially full. The northern corridor picks up wildlife-watching traffic, but the boardwalks and Albright Visitor Center stay uncongested by any summer standard. Old Faithful eruption predictions resume around mid-December when the visitor education center reopens for the winter season.

Weather snapshot.

Mammoth's December normal high is 30.3°F, the lowest daytime normal of the year, with a normal low of 11.9°F, tied with January. The 12.6-inch snowfall normal is the heaviest month at that station, and the interior gets far more; the oversnow routes through Old Faithful and Norris depend on it. NPS gives park-wide winter readings of 0 to 20°F with sub-zero nights. The shortest day of the year falls on December 21, which makes the dawn wildlife window short, cold and worth setting an alarm for.

Access snapshot.

The Gardiner to Cooke City corridor through Mammoth and Lamar, about 50 road miles, stays open to cars. Oversnow travel into the interior opens December 15, 2026 and runs until routes close between March 7 and March 15, 2027; trips enter from the West, South, East and North entrances. Mammoth Hot Springs Hotel is open, having run since April 24 and continuing to March 7, 2027, and Old Faithful Snow Lodge runs December 16, 2026 to March 7, 2027 per the operator, reached only by oversnow. The operator runs a snowcoach twice daily between Mammoth and the Snow Lodge and a daily winter shuttle from Bozeman to Mammoth, though the two cannot be booked for the same day. Mammoth Campground is open all year. See the <a class='inline' href='https://www.nps.gov/yell/planyourvisit/operating-dates.htm' target='_blank' rel='noopener noreferrer'>NPS operating dates page</a>. The park's alerts sit on the <a class='inline' href='https://www.nps.gov/yell/planyourvisit/conditions.htm' target='_blank' rel='noopener noreferrer'>NPS current conditions page</a>: closures, construction, fire restrictions and water.

Seasonal events.

December opens the winter wildlife season. The northern range is the winter habitat for the park's elk, bison, deer and pronghorn, and the packs that hunt them; NPS calls it one of the best places in the world to watch wolves and says they are most active at dawn and dusk. Snow-frosted thermal features and the Old Faithful-in-winter view come back once the oversnow routes open. All unplowed roads and trails are open to skis and snowshoes, and NPS recommends traction aids on the boardwalks and warns that people have died breaking through thin ground near thermal areas.

Audience verdict.

December serves two visitors: the winter first-timer who wants the snowcoach trip with the in-park lodges open, and the photographer who wants Old Faithful in deep snow under the year's lowest sun. It is not a month for young children, given the cold and the short days, and not an RV month. The holiday weeks run full at both winter lodges and with the snowcoach operators, so book well ahead; rooms open 13 months in advance and dinner reservations 60 days out. Plan the first two weeks only if the corridor alone is enough.

Common questions.

Is December a good time to visit Yellowstone?

December runs very quiet at Yellowstone, about 4% of the July peak, with harsh winter cold (average highs near 30°F). If thinner crowds are the goal, it is one of the easier months to pick.

How crowded is Yellowstone in December?

December averages about 33,648 recreation visits, roughly 4% of Yellowstone's busiest month (July). That puts it among Yellowstone's quietest months.

How much of Yellowstone is open in December?

In a typical December, about 40% of Yellowstone's road network (weighted by how important each route is) is open to wheeled vehicles. Road-opening dates shift year to year, so check the official NPS page for current conditions before you go.

Methodology

Monthly recreation visits come from the official NPS Visitor Use Statistics Data Package, 2025 on NPS IRMA Stats; the statistic shown is Recreation Visits, the 5-year mean for 2021-2025. Climate normals come from NOAA NCEI's 1991-2020 U.S. Climate Normals at Yellowstone Park, Mammoth, WY (station USC00489905, 6,194 ft elevation). The access score weights named park roads by route importance for typical wheeled-vehicle openings that month. Sunrise and sunset figures in the editorial are U.S. Naval Observatory times for Mammoth on the 21st of each month. Operating dates drift year to year. The 2026 road schedule, the facility and lodging dates and the oversnow season above were read on 2026-09-13; confirm current dates on the official NPS Yellowstone page before booking. Independent site, not affiliated with the National Park Service.