Annadel Half Marathon

10/09/2026

https://raceroster.com/events/2027/138662/annadel-half-marathon

10/09/2026

09/26/2026

🌲 4 DAYS LEFT! 🏃‍♀️

The trails are calling! Early Bird pricing for the 2027 Annadel Half Marathon, 10K & 5K ends September 30!

Fresh air, beautiful trails, and a little adventure await.

Saturday, April 17, 2027

Register before prices increase October 1!

https://raceroster.com/events/2027/138662/annadel-half-marathon

09/17/2026

THE TRAILS ARE CALLING… AND YOU’RE ANSWERING!

We’ve been seeing new names popping up on the Annadel Half Marathon, 10K & 5K registration list, and we’re getting excited!

It looks like a lot of you already have Annadel on your 2027 race calendar.

🏃‍♀️ Half Marathon • 10K • 5K
🌲 Trione-Annadel State Park
📅 April 17, 2027

Annadel Half Marathon Spring Lake Regional Park 5585 Newanga Avenue, Santa Rosa, CA, USA - Annadel Half Marathon/10K/5KThe Annadel Half Marathon, 10K,… - April 17, 2027

09/12/2026

🌲 FIND YOUR RESET.

No traffic. No screens. No noise.
Just dirt beneath your feet, fresh air, and the trail ahead.

Trail running has a way of clearing your head while challenging everything else.

Run wild. Run happy. Run Annadel. 🌲🏃

Annadel Half Marathon • 10K • 5K
📅 April 17, 2027

09/02/2026

GOOD THINGS ARE HAPPENING IN 2027! 🎉

We’re already working behind the scenes to make this year’s race even more fun and memorable — with great courses, race-day energy, and a few exciting things still to come. 👀

But one thing you don’t want to wait on…

🐦 EARLY BIRD PRICING ENDS SEPTEMBER 30!

Register now to lock in your spot AND the lowest pricing of the season.

⛰️ ANNADEL HALF MARATHON, 10K & 5K

April 17, 2027

Beautiful trails, challenging miles, and one of our favorite Sonoma County running traditions.

https://raceroster.com/events/2027/138662/annadel-half-marathon

SAVE YOUR SPOT. SAVE SOME MONEY. GET READY FOR A GREAT 2027! 🏃‍♀️🏃‍♂️

Early Bird Pricing ends September 30, so don’t wait!

08/21/2026

Bringing a race to life takes teamwork, passion, and a lot of behind-the-scenes planning. From organizing the course and coordinating vendors to supporting runners on race day, our team works together to create fun, welcoming, and memorable events for our community.

We can’t wait to see you at the starting line!

08/08/2026

🌲 Some races become traditions. Annadel has become a community. ❤️

For years, runners, mountains bikers, equestrians, hikers, volunteers, families, and supporters have gathered in beautiful Annadel State Park to celebrate the trails we all love. From first-time 5K finishers to season half marathoners, the Annadel Half Marathon, 10K & 5K has created countless memories and lasting friendships.

These photos remind us how special this event has become—not just because of the miles, but because of the people who make it happen year after year.

We're proud that this race continues to grow while staying true to what makes it so unique: breathtaking trails, an incredible running community, and a shared appreciation for one of Sonoma County's most treasured parks.

Thank you to every runner, volunteer, sponsor, supporter, and park partner who has helped make this event what it is today. We can't wait to create even more memories with you on April 17, 2027.

Registration is open, and we'd love for you to be part of the next chapter. https://raceroster.com/events/2027/138662/annadel-half-marathon

🌿 Run the trails.
💚 Support our parks.
🏃 Join the tradition.