Set for its 11th annual running this fall, the Happy Girls Run Sisters takes runners on a course with stunning views along the Peterson Ridge Trail, a more than 20-mile-long network of mountain biking and hiking trails built on old forest service roads and single-track trails that, depending on the season, can be dusty and loose or packed with snow.
Happy Girls Run Sisters Half Marathon & 5k
October 25, 2025
Sisters
Road
Ready to sign up?
100-500
Challenging
Mountain Views
High: 53°
/ Low: 36°
For those running the half marathon, the race follows a loop route that starts along the Peterson Ridge Trail itself, starting and finishing at the FivePine Lodge and Conference center.
Once you start the race, you’ll head north along the trail, winding through the forest as you make your way south away from Sisters, a town of about 2,000 in central Oregon that’s named for the majestic Three Sisters Mountains that look over it in the nearby Willamette National Forest.
The race follows a net zero elevation gain from start to finish, despite the 500-foot elevation gain in the first half of the course. The second half of the course is almost entirely downhill, allowing runners to recover from the first half’s uphill climb. Organizers say the race is designed both for “first-time racers and seasoned runners,” as the terrain can be challenging in spots but overall it’s a hard-packed course.
The terrain is 95% trail, they add, noting that it’s almost entirely single-track trails through the forests and open areas of the Peterson Ridge Trail system. The parts that aren’t trail are the roads you’ll run when you make it into Sisters, on the way to the finish line at the FivePine Lodge and Conference center.
Walkers are encouraged to participate, organizers add, as the cutoff for official timing is 1:00 PM.
Overview
Set for its 11th annual running this fall, the Happy Girls Run Sisters takes runners on a course with stunning views along the Peterson Ridge Trail, a more than 20-mile-long network of mountain biking and hiking trails built on old forest service roads and single-track trails that, depending on the season, can be dusty and loose or packed with snow.
Course Description
For those running the half marathon, the race follows a loop route that starts along the Peterson Ridge Trail itself, starting and finishing at the FivePine Lodge and Conference center.
Once you start the race, you’ll head north along the trail, winding through the forest as you make your way south away from Sisters, a town of about 2,000 in central Oregon that’s named for the majestic Three Sisters Mountains that look over it in the nearby Willamette National Forest.
The race follows a net zero elevation gain from start to finish, despite the 500-foot elevation gain in the first half of the course. The second half of the course is almost entirely downhill, allowing runners to recover from the first half’s uphill climb. Organizers say the race is designed both for “first-time racers and seasoned runners,” as the terrain can be challenging in spots but overall it’s a hard-packed course.
The terrain is 95% trail, they add, noting that it’s almost entirely single-track trails through the forests and open areas of the Peterson Ridge Trail system. The parts that aren’t trail are the roads you’ll run when you make it into Sisters, on the way to the finish line at the FivePine Lodge and Conference center.
Walkers are encouraged to participate, organizers add, as the cutoff for official timing is 1:00 PM.
