Booking odds · August
Three Sisters Group Site (MT) in August: How Hard Is It to Book?
Three Sisters Group Site (MT) · MT · Bitterroot National Forest
The verdict
Booking difficulty 10 out of 10. Gone within minutes of release. Bring a plan B.
August weekends are typically gone within minutes of the booking window opening.
Three Sisters Group Site (MT) in August scores 10 out of 10 for booking difficulty — lottery-hard. Gone within minutes of release. Bring a plan B.
Across the last 3 years of reservation history, the typical August booking was locked in about 219 days before arrival, with the campground running roughly 106% full that month. The lightest arrival day is Monday, so shifting to a midweek start is the single easiest way to improve your odds.
How far ahead people book
Weekend vs. weekday demand
Best odds: arrivals are lightest on Monday in August. A midweek arrival is your easiest booking.
Get notified when a spot opens
Three Sisters Group Site (MT) in August books up fast. We'll email you if a spot opens up. No spam, unsubscribe anytime.
When August reservations open
Reservations for Three Sisters Group Site (MT) in August 2027 operate on a rolling 6-month window releasing at 7:00 AM ET.
August 1 stays open
February 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 August 1, 2027 become bookable on February 1, 2027 at 7:00 AM ET. Each subsequent date throughout August 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.
How much does it cost to camp at Three Sisters Group Site (MT)?
$75.00 per reserved day/night and $5.00 additional vehicle charge applies when more than 8 vehicles. Self service fee station on 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.
Easier nearby options in August
If your dates are flexible, these nearby campgrounds are typically easier to book.
Three Sisters Group Site (MT) in August: common questions
- How hard is it to book Three Sisters Group Site (MT) in August?
- Three Sisters Group Site (MT) rates 10 out of 10 for August — Lottery-hard. Gone within minutes of release. Bring a plan B.
- How far in advance should I book Three Sisters Group Site (MT) for August?
- The typical August reservation was made about 219 days before arrival, so plan to book as early as your dates allow.
- When do August reservations open for Three Sisters Group Site (MT)?
- Reservations for Three Sisters Group Site (MT) in August 2027 open on a rolling 6-month window. Sites for August 1 become bookable on February 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 Three Sisters Group Site (MT) in August?
- Arrivals are lightest on Monday. A midweek arrival is usually the easiest booking.
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