Rules and FAQ
No headphones or strollers
Enviro-Sports bans headphones and any audio device at its races because the trails are narrow and runners need to hear each other; anyone seen using one is disqualified. Strollers are not allowed either.
Mt. Tam Wild Boar Half Marathon and 10K 2027
- Date
- Saturday, April 24, 2027
- Location
- Mill Valley, California
Go to the race website
Registration details are on the race's own site.
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Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| 10K | 10K | Apr 24, 2027 | See registration | – |
| Half Marathon | Half Marathon | Apr 24, 2027 | See registration | – |
Fees and dates are from the race's official website on the date shown below; confirm them there before you register.
Race day planning
What a typical finish looks like
A typical finisher at a half marathon in California runs 2:37:28, about 12:01 a mile, based on 44 races with published results. Women typically finish in 2:49:24 and men in 2:29:51.
Light and altitude
Sunrise on race morning is at about 6:24 AM.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
Mt. Tamalpais State Park, Mill Valley, CA
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
Race guide
What runners should know about Mt. Tam Wild Boar Half Marathon and 10K, in brief, from the official race website.
More from the race
Refunds and credits
Entry fees are not refunded or transferable. A runner who withdraws at least 30 days before race day can get a rollover credit toward a later Enviro-Sports event, minus a rollover fee.
More from the race
Discount for young runners
Children aged 8 to 13 who run with an adult get half off the entry fee through the EnviroKids program; email the organizer to sign them up.
Facts on this page come from the race's official website (envirosports.com/marin-trail-runs, envirosports.com/event-calendar, envirosports.com/faqs), checked Sep 28, 2026. Confirm dates and fees there before you travel.
Race details
- Where
- Mt. Tamalpais State Park, Mill Valley, CAMap
- Course
- Trail
- Distances
- Half Marathon, 10K
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is Mt. Tam Wild Boar Half Marathon and 10K?
- Saturday, April 24, 2027.
- How much does it cost?
- See the registration page for current pricing.
- What distances can I run?
- Half Marathon, 10K.
- Where does it start?
- Mt. Tamalpais State Park, Mill Valley, CA.
About the race
A spring trail half marathon and 10K in Mt. Tamalpais State Park above Mill Valley, through forest and hills in Marin County. Enviro-Sports organizes it.