Campsite Odds

Booking odds · April

Mammoth Campground (Yellowstone) in April: 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

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

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

Across the last 1 year of reservation history, the typical April booking was locked in about 6 days before arrival, with the campground running roughly 32% full that month. The lightest arrival day is Thursday, so shifting to a midweek start is the single easiest way to improve your odds.

Lead time

How far ahead people book

Same day: 19% of bookings19%Same day1–3d: 21% of bookings21%1–3d4–7d: 18% of bookings18%4–7d1–2wk: 23% of bookings23%1–2wk2–4wk: 3% of bookings2–4wk1–2mo: 1% of bookings1–2mo2–3mo: 2% of bookings2–3mo3–6mo: 12% of bookings12%3–6mo6mo+: 0% of bookings6mo+Median booking lead time: 6 days ahead
Demand split

Weekend vs. weekday demand

Weekend (Fri–Sat)Weekday (Sun–Thu)

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

Booking window · April 2027

When April reservations open

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

April 1 stays open

October 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 April 1, 2027 become bookable on October 1, 2026 at 7:00 AM ET. Each subsequent date throughout April 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 April: common questions

How hard is it to book Mammoth Campground (Yellowstone) in April?
Mammoth Campground (Yellowstone) rates 2 out of 10 for April — Easy. Usually available — you can often book close to your trip.
How far in advance should I book Mammoth Campground (Yellowstone) for April?
The typical April reservation was made about 6 days before arrival, so plan to book as early as your dates allow.
When do April reservations open for Mammoth Campground (Yellowstone)?
Reservations for Mammoth Campground (Yellowstone) in April 2027 open on a rolling 6-month window. Sites for April 1 become bookable on October 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 April?
Arrivals are lightest on Thursday. A midweek arrival is usually the easiest booking.

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