Rim Rock 50 Mile Trail Challenge

03/05/2026

Time to fill up that race calendar! 🗓️

The Rimrock 50 Mile Trail Challenge is exactly that—a challenge. This beautiful course takes runners onto terrain that an organized event has never used before, winding through the stunning Napa Open Space at Alston Park.

Join us on May 16, 2026 for an epic adventure on newly opened trails and rugged terrain. Expect breathtaking views all day long and a true trail-running experience.

Make a weekend of it—stay a night or two, camp in the park, soak in the trail vibes, and enjoy the old-school atmosphere of a small, community-focused event.

Every runner will receive post-race food, drinks, and a place to relax. Kick back, recover, and cheer on fellow runners as they make their way across the finish line.

Come run, camp, and celebrate the trail together BayTrailrunners

https://ultrasignup.com/register.aspx?did=127024

Friends of the Napa Open Space District Bay Area Ridge Trail Todd Run UltraSignup Skyline Wilderness ParkLong Run Co. Rim Rock 50 Mile Trail Challenge

02/26/2026

🔥 RIM ROCK 50 MILE TRAIL CHALLENGE 🔥

Ready to test yourself on one of Northern California’s toughest and most beautiful trail races? Join us May 16th at Skyline Wilderness Park (Napa, CA) for the Rim Rock 50 Mile Challenge — and this year you can go solo OR grab a friend and race as a 2-person team relay 💥

Expect:⛰️ Incredible panoramic views of Napa Valley & the Bay Area🌿 Brand new trails mixed with the rugged terrain you love🔥 Steep climbs, fast descents, single track & fire roads🤝 The same grassroots Bay Trailrunners vibe and community energy🥗 Post-race food, drinks, and an amazing volunteer crew

This is more than a race — it’s a full day adventure with camping, community, and that gritty trail spirit that keeps people coming back.

⚠️ The race is filling FAST — secure your spot now before it sells out.

👉 Register today and be part of the challenge.



https://ultrasignup.com/register.aspx?did=127024

BayTrailrunners UltraSignup Friends of the Napa Open Space District Bay Area Ridge Trail Skyline Wilderness Park Todd Run American Trail Running Association

02/11/2026

We were out this weekend doing trail recon and a full course preview for the Rim Rock 50 Mile Trail Challenge — happening May 16, 2026 at Skyline Wilderness Park in Napa.

And let me tell you… this course is coming alive.

Brand new trails that reach out to massive vistas overlooking the entire Bay Area and Napa Valley. Rolling hills that lull you in. Steep inclines that test you. Long descents that demand respect.

Single track.
Fire roads.
Fern-covered corridors.
Miles and miles of oak-lined trail.

This isn’t a city ultra.
This isn’t a flat cruise.

This is one of Northern California’s newest — and hardest — 50 mile races.

Brought to you by Bay Trailrunners, this event stays true to old-school trail running. Grit. Community. Volunteers who are the backbone of it all. Aid stations that feel like family. Camping under the stars. A shared meal after 50 tough miles.

If you’re building toward your first 50.
If you’re sharpening up for a 100.
If you just want to test yourself on real terrain…

Come be part of it.

May 16, 2026
Skyline Wilderness Park
Napa, CA

Registration is open. Secure your spot before pricing moves.

Let’s get after it.
Bay Area Ridge Trail Friends of the Napa Open Space District BayTrailrunners UltraSignup Todd Run

https://ultrasignup.com/register.aspx?did=127024

02/09/2026

What a wonderful day out on the trails doing recon for the Rim Rock Trail Challenge 50-Mile and exploring some brand-new routes for the Skyline Wilderness Trail Run at Skyline Wilderness Park and Napa Open Space.

We got to check out some absolutely beautiful new trails that have just opened this year—yes, some of these will be part of the 2026 courses. The parks have put in a ton of work updating signage, improving trail conditions, and dialing in the camping areas, and everything is looking fantastic. There’s plenty of room for everyone this year.

We’re looking forward to another great event with:
• Camping
• Great food & drinks post-run
• Incredible volunteers and staff
• A familiar aid station at Lake Marie
• A brand-new aid station deep out on the new trails 🌲

Registration is now open—save your spot before the next pricing increase kicks in. Come experience these trails with us May 16th, 2026. 👟⛰️

BayTrailrunners Bay Area Ridge Trail Friends of the Napa Open Space District Todd Run Skyline Wilderness Park UltraSignup American Trail Running Association

Register to Run or Volunteer

https://ultrasignup.com/register.aspx?did=127024

02/04/2026

If there’s interest, we’re putting together three training runs ahead of the 50-Mile Rim Rock Trail Challenge. We’ll hit some classic East Bay and Diablo terrain, plus at least one run at Skyline Wilderness Park so you can get a feel for race day.

Come out, get some miles in, meet the crew, and preview the course. Drop a comment or message me if you’re in and we’ll set the dates.

BayTrailrunners Todd Run Bay Area Ridge Trail UltraSignup Friends of the Napa Open Space District Trail Squirrel Adventures

01/21/2026

Looking for a fun and challenging 50 mile Trail Race ? Great views of the Bayarea and the famous Napa Valley. The Rim Rock Trail Challenge takes place on May 16th 2026 at Beautiful Skyline Wilderness Park. The Park offers a wide verity of Camping packages, Stay 1 night or all 3 nights with us.

All the information can be found with our registration partner UltraSignup

You can also sign up to volunteer with us. All volunteers get lunch and future race credits.

Bay Area Ridge Trail Friends of the Napa Open Space District Todd Run ITRA - International Trail Running Association BayTrailrunners Trail and Ultra Running American Trail Running Association Sports Basement Long Run Co. Beercity

https://ultrasignup.com/register.aspx?did=127024

01/01/2026

Looking for an epic race ? Rim Rock 50 Mile is one of Northern California’s most challenging 50 mile races out there. Preview the event on out revisiting page at UltraSignup

May 16th 2026 in the Napa Valley Skyline Wilderness Park.

Use code = happy2026 to enjoy a $26 discount valid until 1/5/2026

Come race and camp with us and make some trail memories

https://ultrasignup.com/register.aspx?did=127024

Friends of the Napa Open Space District ITRA - International Trail Running Association Bay Area Ridge Trail BayTrailrunners Todd Run

12/01/2025

Save Now: Run one of Northern California’s most Challenging 50 miles courses May 16th 2026

https://ultrasignup.com/register.aspx?did=127024

07/07/2025

Welcome to the Inaugural Rimrock 50 Mile Trail Challenge!
Saturday, May 16, 2026 – Skyline Wilderness Park, Napa Valley, CA

We’re thrilled to welcome you to the very first Rimrock 50 Mile Trail Challenge—a bold new endurance event that showcases the breathtaking beauty and rugged terrain of Napa’s finest trail systems. This isn’t just another race—it’s a journey through history, wilderness, and the raw edge of adventure.

Your challenge begins in the heart of Skyline Wilderness Park, winds through the scenic Napa Open Space Preserve, and ventures deep into the newly opened Suscol Headwaters Trail System—a pristine and rarely accessed stretch of wild hills, oak forests, and sweeping valley views.

Whether you’re here to race, push your personal limits, or just soak in the spirit of the trail running community, you’re part of something special. Thank you for being part of year one. Let’s make it epic.

See you on the trails,
—The Rimrock 50 Mile Race Directors and the Trail Squirrel Adventures Team

Register Now!

06/24/2025

Plan Early. Sign Up Now. Get the Best Price!
Early bird pricing is now available for the Rim Rock Trail Challenge — a 50-mile solo or 2-person relay adventure through Skyline Wilderness Park and the Napa Open Space Preserve, featuring newly cut trails and epic views.

Join us on May 16, 2026
Registration is OPEN on UltraSignup – spots are limited, so don’t wait!

Secure your place now and take on one of the toughest, most scenic trail races in Northern California.



https://ultrasignup.com/register.aspx?did=127024
Bay Area Ridge Trail Friends of the Napa Open Space District Rim Rock 50 Mile Trail Challenge Napa Valley, California Skyline Wilderness Park Trail and Ultra Running UltraSignup American Trail Running Association ITRA - International Trail Running Association Ultra Running Trail Squirrel Adventures No Meat Athlete Fleet Feet Tailwind Nutrition UltrAspire Nathan Sports Dusty Bottoms Trail Runners Trail Sisters Sports Basement Long Run Coffee Todd Run

06/24/2025

Plan Early. Sign Up Now. Get the Best Price!
Early bird pricing is now available for the Rim Rock Trail Challenge — a 50-mile solo or 2-person relay adventure through Skyline Wilderness Park and the Napa Open Space Preserve, featuring newly cut trails and epic views.

Join us on May 16, 2026
Registration is OPEN on UltraSignup – spots are limited, so don’t wait!

Secure your place now and take on one of the toughest, most scenic trail races in Northern California.



https://ultrasignup.com/register.aspx?did=127024

Napa Valley, California Friends of the Napa Open Space District Rim Rock 50 Mile Trail Challenge Skyline Wilderness Park Bay Area Ridge Trail UltraSignup American Trail Running Association Trail and Ultra Running ITRA - International Trail Running Association Ultra Running Trail Squirrel Adventures No Meat Athlete Fleet Feet UltrAspire Nathan Sports Tailwind Nutrition Long Run Coffee Todd Run

06/17/2025

Plan Early. Sign Up Now. Get the Best Price!
Early bird pricing is now available for the Rim Rock Trail Challenge — a 50-mile solo or 2-person relay adventure through Skyline Wilderness Park and the Napa Open Space Preserve, featuring newly cut trails and epic views.

Join us on May 16, 2026
Registration is OPEN on UltraSignup – spots are limited, so don’t wait!

Secure your place now and take on one of the toughest, most scenic trail races in Northern California.

https://ultrasignup.com/register.aspx?did=127024


Napa Valley, California Friends of the Napa Open Space District Long Run Coffee Skyline Wilderness Park Bay Area Ridge Trail UltraSignup American Trail Running Association Trail and Ultra Running ITRA - International Trail Running Association Ultra Running Trail Squirrel Adventures Fleet Feet No Meat Athlete Rim Rock 50 Mile Trail Challenge Trail Sisters Tailwind Nutrition Sports Basement