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Online registration is closed. Race day registration will be available (Marathon $100, Half $80, 10K $70). 

Read the race day details online here.

Babbling streams will be your soundtrack as you challenge yourself on the lush singletrack within Bothe-Napa Valley State Park. The course is a bit challenging with the hills, streams and rocks - which makes it all the more exciting and rewarding. This state park is a local treasure that is untapped by tourists and located just minutes from the area's great restaurants and wineries. The event is limited to 300 participants and sells out every year so don't wait too long to register!

NOTE: This event is in no way associated with the 40th annual Napa Valley Marathon (the road race) on Sunday March 4, 2018. 

Registration fees

Course Map & Elevation Profile


COURSE CUT-OFF TIME: 6 HOURS (13:45min/mile pace for marathoners, 27:30min/mile pace for half marathoners, 58min/mile pace for 10Kers). Hikers/Walkers are welcome to participate.

Additional Details


COURSE MARKINGS: The course will be marked with orange ribbon. Pay close to attention whenever you come to a trail crossing and follow the orange ribbon to make a turn or cross the trail. NEVER ASSUME the person in front of you knows where they're going or is a part of the race.

AID STATIONS: There is one aid station at the start/finish area. Half marathoners will see it once in between their two loops. Marathoners will see it at miles 6, 10, 16, 20. We highly recommend that you carry water.

INCENTIVES: T-Shirts for all participants. Rubber chicken to the first place overall male & female in each distance. Personalized award ribbons to the top three finishers, male and female, in each age group for all distances which will be mailed out a few weeks after the race.

BIB NUMBERS: Bib numbers will be mailed out to participants beginning two weeks before the event. If you do NOT receive a bib prior to race day, you will pick one up on race day morning at 8:00AM. If you did not supply a valid mailing address when you registered, or if your mailing address has changed, please e-mail us at

PARKING: is $8 per vehicle in Bothe-Napa State Park. Free parking is available along Hwy 29 outside the park; this is also our overflow parking once all spaces within the park are full. If you are parking along Hwy 29, be sure to park legally or you will get ticketed!

DRIVING DIRECTIONS: Google Maps Link to Park Entrance.

CANCELLATIONS: Registrations are non-refundable and non-transferable. If you email us by September 27, you may receive a rollover credit (the amount you paid minus a $10 fee) to use toward any future Enviro-Sports race.

HEADPHONES POLICY: Since parts of this race include very narrow trails with steep drop-offs along the course, it is imperative that runners can hear each other in order to pass safely, even if they are running at a slow speed. For safety reasons (and for the enjoyment of your fellow runners) headphones (and any other audio devices) are NOT allowed.

Event Partners

Event Schedule

  • October 27 9:00 AM PDT - Race Starts

Contact Information

Event Location

Bothe-Napa Valley State Park, Saint Helena Highway, Saint Helena, CA, United States

Click here to view map