Napa Valley Trail Marathon

Napa Valley Trail Marathon, Half Marathon & 10K

This event takes place on March 21, 2026, at Bothe-Napa Valley State Park in Saint Helena, California. The field is limited to 300 participants. The event is not associated with the Napa Valley Marathon road race scheduled for March 2026.

Distances offered:

• Marathon
• Half Marathon
• 10K

The courses run on lush single-track trails with hills, streams, and rocky sections. The 10K is a single loop. The Half Marathon follows the 10K loop twice. Marathoners run the 10K loop, a 4-mile out-and-back to the Old Bale Grist Mill, repeat that sequence, then finish with a final 10K loop. The course is marked with orange ribbon at turns and trail crossings.

There is one aid station at the start/finish area; half marathoners pass it once between loops, and marathoners encounter it at miles 6, 10, 16, and 20. A course cut-off time of six hours applies with published pace thresholds for each distance. Participants are advised to carry hydration.

Bib numbers are mailed beginning two weeks before the event; unmailed bibs may be picked up on race morning. Registrations are non-refundable and non-transferable. T-shirts are provided to participants, finisher medals are awarded for full and half marathon finishers, and personalized award ribbons are mailed to top three finishers in each age group. Headphones and other audio devices are not allowed on course due to narrow trails and steep drop offs. Visit the organization's website for the most recent information.