MT. TAM TRAIL RUN
10K, Half, 30K, 50KNovember 7, 2026
Mt. Tamalpais State Park
Stinson Beach, CA
RACE INFO
Mt. Tamalpais is the dominating feature in Marin County. Any true trail runner who sees it wants to run up it. Here’s your chance. Our Mt. Tam Trail Run begins at Stinson Beach and climbs (and climbs!) to perched views from Tam before returning via some of the best trails the Headlands have to offer until reaching the beach and bountiful post race food. Bring the family and enjoy an afternoon with friends in the sand and surf.
Park Information: Mt. Tam State Park, Muir Woods National Monument
Start Times:
50K & 30K – 7:30 AM
Half & 10K – 8:00 AM
Check-In & Bib Pickup:
Early Check-In
Friday, November
2:00 PM – 5:30 PM
San Francisco Running Company
247 Shoreline Highway, Mill Valley, CA 94941
Race Morning Check-in @ Stinson Beach: 6:30 AM – 8:00 AM
Time Limit: There is an 8.5 hour time limit for the 50K & 30K race. All runners must be off the course by 4:00 PM.
Capacity: The Mt. Tam Trail Run has a capacity of 500 runners, across all distances.
Parking: Parking is available within the Stinson Beach Day Use Area and is free of charge. Carpooling is always strongly encouraged.
Directions:
Stinson Beach Park
Golden Gate National Recreation Area
3545 Shoreline Hwy, Stinson Beach, CA 94970
Click for Directions
50K Prize Purse – Female & Male Overall TOP 3!
1st – $300
2nd – $200
3rd – $100
Timing: All races are professionally chip timed, utilizing MyLaps and Race Director, ensuring your time is captured as accurately as possible. Disposable chips are attached to back of each bib number.
Post Race: We offer a broad selection of sweet and salty snacks, as well as fresh fruit and a diverse line up of pre-packaged food options (chips, fruit snacks, jerky, etc.).
Dog Policy: Dogs are allowed at Stinson Beach. Pups must be on leash at all times. However, dogs are not permitted on the trails of Mt. Tam, so you may not run with your pup.
COURSE MAPS
50K (30.0 Miles with 6,000′ Elevation Gain)
30K (18.5 Miles with 3,900′ Elevation Gain)
Half Marathon (13.0 Miles with 2,800′ Elevation Gain)
10K (6.8 Miles with 1,600′ Elevation Gain)
DETAILED COURSE INFO
Printable Course Information
Course Composition
The vast majority of the course will be run on technical dirt trails and non-technical fire roads. The hills can be steep, long, and challenging! Hiking/trekking poles are permitted at this venue.
Course Markings
Courses are marked with colored surveyor ribbon, placed approximately every 200 meters along the course. Turns are marked heavily on the inside of the turn, with ~3 ribbons placed just before and just after the intersection. There will also be 8.5″ x 11″ laminated signs and flour arrows on the ground (when allowed) at critical or complicated sections. The detailed course map displays which colored ribbons must be followed for each route. Please keep in mind if you are running a longer distance, you will likely need to follow more than one color while out on the course. The most important course marking is the blue ribbon. Blue ribbons indicate “wrong way” trails. You will see blue ribbons, but do not run past a blue ribbon or you will be heading off course!
Aid Stations
Inside Trail Racing aid stations are replete with an optimal variety of glycogen-replenishing, electrolyte-replacing products. The following is a list of some of the foods and beverages each aid station may provide: Gu Energy gels (not on GGNRA property) and chews, Gu Stroop-Waffles, trail mix, pretzels, potato chips, Oreo cookies, PB&J sandwiches, M&M’s, boiled potatoes with salt, Coke, Ginger Ale, water, Pickle Juice, Skratch Hydration Mix, salt tablets, and seasonal fresh fruit. Aid stations will have general first aid items (but no anti-inflammatory medicine).
Gu Gels are not permitted to be provided at aid stations for events within the Golden Gate National Recreation Area (GGNRA). Therefore, there will NOT be Gu Gels at Muir Beach and you must use and throw away Gu Gel’s at Cardiac & Deer Park Aid Stations, you cannot take them out of the aid station with you.
As distances between aid stations vary, we strongly encourage all runners to carry at least one 20oz bottle during their run.
Skratch Hydration is mixed to contain 80 – 100 calories per 20 fluid ounces.
Drop bag services are not available.
Cupless Event
This a cupless event, meaning aid stations will not have paper cups available for runner use. Each runner will be responsible for carrying their own water bottle or reusable cup. Reusable cups and soft flasks are made of silicone, are collapsible, and easy to carry with you while you run. Going cupless will keep hundreds, or thousands, of paper cups from being thrown away or left littering the trails. Read more about our cupless events here. We will be selling reusable cups ($5) and 500ml Soft Flasks ($15) at bib pick-up, NOT on GGNRA property race morning.
Run with us at Mt. Tam!
VOLUNTEER
Without the support of enthusiastic and caring volunteers producing our races would not be possible. Volunteers of all ages and abilities help with setup, check-in, aid stations, course marshaling, timing, and post-race food. Volunteering is a fun, novel way to experience races, play in the outdoors, and spend time with friendly people.
All volunteers receive a free race T-shirt, free food, and the ability to earn credit toward a future Inside Trail Racing event, commensurate to the amount of time worked.
To volunteer for this year’s event, please submit our online volunteer form.
AWARDS
★ In an effort to promote healthy competition, overall awards are determined by gun time (the first 3 men and women across the finish line). Age group awards are determined by chip time (the time from crossing the start line to crossing the finish line).
Purse Prize Structure
- Top 3 men and women in the 50K will receive a share of the prize purse ($$ subject to increase based on donations), a free iTR Race Entry, and Inside Trail Running Swag.
- Overall winners of the 30K, Half Marathon, and 10K will receive a free iTR Race Entry, and Inside Trail Running Swag.
- Top Three Male/Female in all our events will earn a custom trophy from Ragged Cuts.
All finishers will receive a custom medal with the race logo.
All 50K finishers will receive a pint glass with the race logo.
The Dead Last Finisher (DLF) in each even will receive a custom award.
Age-group medals (3 deep) will be awarded in the following categories, for male, female and non-binary:
• 13 and under
• 14 – 19
• 20 – 29
• 30 – 39
• 40 – 49
• 50 – 59
• 60 – 69
• 70 and over
SHIRTS
Most of our race shirts are District Perfect-Tri tri-blend fabric shirt. This tee is made with top-of-the-line sportswear technology to heighten performance during your toughest workouts. With sun defense, moisture-wicking technology, quick stain release, and comfortable fit, this tri-blend performance crew serves the needs of every athlete. It’s the perfect year-round choice for outdoor sports and exercise. Get the most out of your workout with this tough, hardworking tee.
Features:
● 4.5-ounce, 50/25/25 poly/combed ring spun cotton/rayon, 32 singles
● 1X1 rib knit neck
● Shoulder to shoulder taping
● UPF 30
To be guaranteed a shirt and shirt size, you must register by October 24, 2026.
COURSE RECORDS
| Race | Name | Age | Year | Time |
| 10K – Male | Nick Handell | 27 | 2019 | 46:31 |
| 10K – Female | Maria Dalzot | 29 | 2017 | 57:25 |
| Half Marathon – Male | David Roche | 26 | 2014 | 1:34:53 |
| Half Marathon – Female | Megan Roche | 24 | 2014 | 1:49:21 |
| 30K – Male | Alex Varner | 30 | 2015 | 2:11:41 |
| 30K – Female | Rea Kolbl | 24 | 2015 | 2:39:43 |
| 50K – Male | Rickey Gates | 32 | 2013 | 3:49:21 |
| 50K – Female | Leandra Zimmermann | 26 | 2023 | 4:34:30 |
PAST RESULTS
MT. TAM TRAIL RUN
November 12, 2022
MT. TAM TRAIL RUN
November 13, 2021
MT. TAM TRAIL RUN
November 9, 2019
Half Overall
30K Overall
50K Overall
Results for previous years can be viewed on Ultrasignup.
THE FINE PRINT
ITR Refund Policy:
Entry fees to our trail runs are non-refundable in all cases, and we do not offer credits, transfers, or deferrals to future races except as described below. Only registered runners can participate in our races, and you cannot exchange your entry with anyone else in any case.
We are happy to issue a credit worth 50% of your original race fee toward a future Inside Trail Racing event if we receive your cancellation at least 3 weeks prior to the race. Credits will expire 1 year after the date issued. There will be no credit provided if a cancellation is made within 3 weeks of the race.
While we understand that last-minute injuries, conflicts, emergencies, deaths, and other unfortunate events affecting registered runners can happen and may impact your plans for participation, we must adhere to our cancellation policy stated above and cannot offer any credits, refunds, transfers, or deferrals in any of these cases.
If the situation does arise where ITR must outright cancel an event for any reason, there will be no refunds. This could include earthquakes, floods, extreme weather, unsafe air quality, pandemics, or any other “Act of God”. ITR at its sole discretion may choose to offer future race credit or deferrals in these force majeure situations, depending on the circumstances and how close to the race date the event was cancelled. We will communicate with all registered runners as soon as possible regarding the cancellation and any pertinent information. We do not cancel races due to rain or heat. Due to trail work, closures, or for myriad other reasons, permitting agencies may require changes to the publicized courses at any time prior to an event. This is out of our control, and we therefore will not offer refunds, credits, deferrals, or transfers (except as described below) in such a situation.
If a race location is changed, but still hosted on the same day, we will automatically transfer the registration over to the new venue, or entrants may choose to run the race remotely and we will mail awards. If a race is postponed all entrants will be transferred to the new date.
Please refer to our online FAQ page for answers to other commonly asked questions.
MT. TAM PHOTOS
Sponsors
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