Run the Rim
Arnold, United States • 31 May 2026
Run the Rim by Arnold Rim Trail Association
Arnold Rim Trail Association is hosting the second Run the Rim trail run on Sunday, May 31, 2026 at White Pines Lake Park in Arnold, CA. The event offers multiple trail race distances and supports the association's ongoing trail development and maintenance.
Distances available:
- 50k Ultra (new for 2026)
- 35k Classic (22 miles, end to end on ART posts 100 to 1)
- 21k (half marathon distance)
- 10k
- 5k (new for 2026)
The 50k, 35k and 21k courses are mainly single track trails that wind through pine, fir, and cedar forests and include notable vistas. The 35k follows the Arnold Rim Trail end to end between official posts. The 10k and 5k circle White Pines Lake and include single track sections. The 21k and 10k use two improved loop courses.
Registration fees vary and increase after April 15: 50k Ultra $75 then $90, 35k $60 then $75, 21k $50 then $65, 10k $40 then $50, 5k $25 then $30.
Maps and additional trail information are available from the Arnold Rim Trail website. Race results can be automatically posted to Twitter if participants connect their account. Visit the organization's website for the most recent information.