Campground · MT
Three Sisters Group Site (MT)
MT · Bitterroot National Forest
Three Sisters Group Site (MT) is generally lottery-hard to book. Difficulty holds fairly steady across the 3 months we have reservation data for. The heat strip below breaks down every month — pick one for its full odds, lead-time chart, and easier nearby alternatives.
Booking difficulty by month
Midweek tip: in the busiest month (June), arrivals are lightest on Tuesday — shift your dates to improve your odds.
When reservations open
Booking window
Reservations open on a rolling 6-month window at 7:00 AM America/New York.
For example, sites for April 15, 2027 become bookable on October 15, 2026. Set a reminder a few minutes before release for the best shot.
Standard Recreation.gov 6-month rolling window: sites become bookable 6 months before arrival at 7:00 AM ET.
Sites & amenities
- 1 accessible sites
Activities: BIKING, CAMPING, BOATING, CANOEING, DAY USE AREA, HIKING, KAYAKING, NON-MOTORIZED BOATING, MOUNTAIN BIKING, PHOTOGRAPHY, PICNICKING, SAILING, SWIMMING, SWIMMING SITE, WATER ACCESS, WATER ACTIVITIES, WATER SPORTS
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.