HALF MARATHON
The Half Marathon course is a hilly, and technical course designed for the experienced trail runner looking for a challenge. Enjoy gorgeous scenery with green meadows, wild flowers, and variety of beautiful trees. The race starts near the Upper Oak Knolls picnic area and climbs into Annadel State Park. The Annadel Half Marathon is a tough course with wet, rocky and rooted terrain. The race will feature chip timing, a free t-shirt, a finisher medal, post-race food and beer!
Parking fee is $8 at the entrance or free with your Sonoma County Regional park pass.
- Date: April 18, 2026
- Time: 9:00 am
- Location: Spring Lake Regional Park, 5585 Newanga Ave., Santa Rosa, CA 95405
- Click here for more information about Annadel State Park.
Parking fee is $8 at the entrance or free with your Sonoma County Regional park pass.
Course Map
www.strava.com/routes/3441498919915355814
Turn by turn directions:
Straight on Canyon Trail (from Oak Knolls)
Left on Rough Go
Left on Cobblestone
Right on Orchard
Left on Rough Go
Left on Live Oak
Right on North Burma
Right on Louis
Left on Warren Richardson
Right on South Burma
Right on Marsh
Left on Canyon to finish
NOTE: Course color is marked in BLUE
Straight on Canyon Trail (from Oak Knolls)
Left on Rough Go
Left on Cobblestone
Right on Orchard
Left on Rough Go
Left on Live Oak
Right on North Burma
Right on Louis
Left on Warren Richardson
Right on South Burma
Right on Marsh
Left on Canyon to finish
NOTE: Course color is marked in BLUE
AID STATION 1 is located at mile 6.12 at the intersection of Louis/Warren Richardson
AID STATION 2 is located at mile 10.41 at the intersection of Marsh/Canyon
Water and electrolytes are available. PLEASE NOTE THAT THIS IS A CUP-FREE EVENT.
BRING YOUR OWN BOTTLE OR REUSABLE CUP!
AID STATION 2 is located at mile 10.41 at the intersection of Marsh/Canyon
Water and electrolytes are available. PLEASE NOTE THAT THIS IS A CUP-FREE EVENT.
BRING YOUR OWN BOTTLE OR REUSABLE CUP!