Campsite Odds

Booking odds · September

Threemile Campground in September: How Hard Is It to Book?

Threemile Campground · WY · Shoshone National Forest

The verdict

Hard

Booking difficulty 8 out of 10. Competitive. Be ready when the booking window opens.

Sells out at openBased on 3 years of reservation data

September weekends are typically gone within minutes of the booking window opening.

Threemile Campground in September scores 8 out of 10 for booking difficulty — hard. Competitive. Be ready when the booking window opens.

Across the last 3 years of reservation history, the typical September booking was locked in about 42 days before arrival, with the campground running roughly 21% 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: 0% of bookingsSame day1–3d: 11% of bookings11%1–3d4–7d: 8% of bookings8%4–7d1–2wk: 15% of bookings15%1–2wk2–4wk: 11% of bookings11%2–4wk1–2mo: 15% of bookings15%1–2mo2–3mo: 9% of bookings9%2–3mo3–6mo: 20% of bookings20%3–6mo6mo+: 12% of bookings12%6mo+Median booking lead time: 42 days ahead
Demand split

Weekend vs. weekday demand

Weekend (Fri–Sat)Weekday (Sun–Thu)

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

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Booking window · September 2027

When September reservations open

Reservations for Threemile Campground in September 2027 operate on a rolling 6-month window releasing at 7:00 AM ET.

September 1 stays open

March 1, 2027

at 7:00 AM ET

Release style

6-Month Rolling Window

Releases daily 6 months ahead at 7:00 AM ET

Campsites for September 1, 2027 become bookable on March 1, 2027 at 7:00 AM ET. Each subsequent date throughout September 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.

Plan B

Easier nearby options in September

If your dates are flexible, these nearby campgrounds are typically easier to book.

REX HALE

WYHard

Slough Creek Campground

WYPlan ahead

Headwaters Campground at Flagg Ranch

WYPlan ahead

FAQ

Threemile Campground in September: common questions

How hard is it to book Threemile Campground in September?
Threemile Campground rates 8 out of 10 for September — Hard. Competitive. Be ready when the booking window opens.
How far in advance should I book Threemile Campground for September?
The typical September reservation was made about 42 days before arrival, so plan to book as early as your dates allow.
When do September reservations open for Threemile Campground?
Reservations for Threemile Campground in September 2027 open on a rolling 6-month window. Sites for September 1 become bookable on March 1, 2027 at 7:00 AM ET, with each subsequent day releasing day-by-day 6 months ahead.
What is the best day to arrive at Threemile Campground in September?
Arrivals are lightest on Thursday. A midweek arrival is usually the easiest booking.

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