Saturday April 12th, 2025

Lake Sonoma, California

All New Course for 2025!

Pardon the construction. We’re working on finalizing details on our new Trail Sisters Half Marathon course. The course will start at the Lone Rock Parking Lot and will finish at the Lake Sonoma Visitors Center! While we haven’t quite settled on the route there are plenty of beautiful trails for us to choose from on the north side of Rockpile Road. After you’ve seen all those great trails, runners will get to run across the Lake Sonoma bridge and then follow the same finishing route as the Marathon and 50 Mile runners. Post race shuttles will be provided to get you back to your car if left at Lone Rock Trailhead. Also… the race will be run on Saturday!

About the Course

The Trail Sisters (TS) Half Marathon is a women’s only event. It was created to foster encouragement and camaraderie amongst all abilities and experience levels. The new course starts at Lone Rock Trailhead and will finish at the Visitors Center.  True to its label, you can expect relentless rolling hills that will challenge your mind and body. Lucky for you though, you will share the journey with a community of supportive Trail Sisters to help you through! You will have 5 hours to complete the half marathon course.

Registration Cost

New for 2025 Early Birds get a discount! Signup early and save!

  • First 50 = $90
  • Next 50 = $100
  • Everyone else = $105
  • Late Signups = $115 (March 1st and after)

Half-Marathon Race Details

Registration Includes

Aid Station Details

To Be Determined but guaranteed to be well supported!