How hard is it to book Mammoth Campground (Yellowstone) in January?

Mammoth Campground (Yellowstone) rates 2 out of 10 for January — Easy. Usually available — you can often book close to your trip.

When do January reservations open for Mammoth Campground (Yellowstone)?

Reservations for Mammoth Campground (Yellowstone) in January 2027 open on a rolling 6-month window. Sites for January 1 become bookable on July 1, 2026 at 7:00 AM ET, with each subsequent day releasing day-by-day 6 months ahead.

What is the best day to arrive at Mammoth Campground (Yellowstone) in January?

Arrivals are lightest on Sunday. A midweek arrival is usually the easiest booking.

Booking odds · January

Mammoth Campground (Yellowstone) in January: How Hard Is It to Book?

Mammoth Campground (Yellowstone) · WY · Yellowstone National Park

The verdict

Easy

Booking difficulty 2 out of 10. Usually available — you can often book close to your trip.

Rarely sells outBased on 1 year of reservation data

January rarely sells out — you can often book close to your trip.

Mammoth Campground (Yellowstone) in January scores 2 out of 10 for booking difficulty — easy. Usually available — you can often book close to your trip.

Based on the last 1 year of reservation history, with the campground running roughly 2% full that month. The lightest arrival day is Sunday, so shifting to a midweek start is the single easiest way to improve your odds.

Lead time

How far ahead people book

Demand split

Weekend vs. weekday demand

47%

53%

Weekend (Fri–Sat)Weekday (Sun–Thu)

Best odds: arrivals are lightest on Sunday in January. A midweek arrival is your easiest booking.

Booking window · January 2027

When January reservations open

Reservations for Mammoth Campground (Yellowstone) in January 2027 operate on a rolling 6-month window releasing at 7:00 AM ET.

January 1 stays open

July 1, 2026

at 7:00 AM ET

Release style

6-Month Rolling Window

Releases daily 6 months ahead at 7:00 AM ET

Campsites for January 1, 2027 become bookable on July 1, 2026 at 7:00 AM ET. Each subsequent date throughout January releases day-by-day exactly 6 months prior to arrival.

Facility note: Standard Recreation.gov 6-month rolling window: sites become bookable 6 months before arrival at 7:00 AM ET.

Fees

How much does it cost to camp at Mammoth Campground (Yellowstone)?

The camping fee in Mammoth Campground is $25 per night per site.

Fee details as listed on Recreation.gov. Rates and passes change by season, so confirm the current price on Recreation.gov before you book.

FAQ

Mammoth Campground (Yellowstone) in January: common questions

How hard is it to book Mammoth Campground (Yellowstone) in January?: Mammoth Campground (Yellowstone) rates 2 out of 10 for January — Easy. Usually available — you can often book close to your trip.
When do January reservations open for Mammoth Campground (Yellowstone)?: Reservations for Mammoth Campground (Yellowstone) in January 2027 open on a rolling 6-month window. Sites for January 1 become bookable on July 1, 2026 at 7:00 AM ET, with each subsequent day releasing day-by-day 6 months ahead.
What is the best day to arrive at Mammoth Campground (Yellowstone) in January?: Arrivals are lightest on Sunday. A midweek arrival is usually the easiest booking.

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