Run The Rim 2026

Run The Rim 2026 takes place on Sunday, May 31, 2026, in the scenic landscape of Arnold, California. Participants will navigate the Arnold Rim Trail, a single-track system characterized by majestic pine, fir, and cedar forests and expansive vistas. Late May in the Sierra Nevada foothills typically brings mild to warm daytime temperatures, often ranging from the 60s to 70s Fahrenheit, though mountain weather can be unpredictable, so preparing for varying conditions is advised. This trail running event offers multiple distances ranging from a 5K to a 50K ultra marathon, with all proceeds supporting the Arnold Rim Trail Association's mission to maintain the local trail system.

What distances and start times are available?

• →50K Ultra Marathon: 8:00 AM
• →35K (22 miles / "Classic"): 8:15 AM
• →21K Half Marathon: 8:30 AM
• →10K: 8:45 AM
• →5K: 9:00 AM

What is the course character for the different distances?

• →50K, 35K, and 21K: These routes consist primarily of single-track trails through pine, fir, and cedar forests, offering classic mountain trail running terrain and scenic vistas. Detailed course maps can be found at Arnoldrimtrail ↗, Arnoldrimtrail ↗, and Arnoldrimtrail ↗.
• →10K and 5K: These distances loop around White Pines Lake and include quality single-track sections. Course details are available at Arnoldrimtrail ↗ and Arnoldrimtrail ↗.

What are the race rules and time limits?

• →All runners must complete their distance and be off the course by the 9-hour time limit, which concludes at 5:00 PM.
• →The event is strictly a trail/single-track event.
• →Timing for all distances is provided by OnYourMark ↗.

Where do the races start and finish?

• →50K & 35K: These distances start via a shuttle to the Fullen Road, Arnold Rim Trail Post 100 Access Point.
• →21K, 10K & 5K: These distances start at White Pines Park.
• →All distances finish at White Pines Park (1965 Blagen Rd, Arnold, CA).

What amenities are provided for participants?

• →Post-race food service begins at 11:00 AM, featuring Pizza Factory service with vegetarian options.
• →Sweet and salty snacks and fresh fruit are also provided.

What is the policy regarding dogs?

• →Dogs are permitted on the Arnold Rim Trail and at White Pines Park.
• →Dogs must be kept on a leash at all times.
• →Runners accompanied by dogs are required to start at the back of the pack to allow all other participants to pass first.

Are there lodging discounts available for runners?

• →Meadowmont Lodge: Call to mention "Run the Rim" for a 5% discount.
• →Timberline Lodge: Use promo code 2026arnoldrimtrailrun when staying from May 30 – June 1 for a 10% discount.