Mt. Tam Trail Run

WHEN: Saturday – November 10, 2018
WHERE: Stinson Beach & Mt. Tamalpais State Park
Stinson Beach Park – GGNRA
Stinson Beach, CA 94970
COST: 10K: $50 / Half: $60 / 30K: $70 / 50K: $80
CONTACT: Inside Trail Racing
Mt. Tam Entrants – Unfortunately, there has been a shift in the winds and it is now unhealthy and unwise to run in these conditions. As of midnight, air quality had remained fair, but clearly things have taken a bad turn and the race is cancelled.

We were going forward with the race because we were betting on better air, and we wanted to be able to provide a beautiful tour of our amazing mountain. All of our crew is currently out at Stinson Beach, so we will be in contact in a couple of hours with more information. We sincerely apologize for this undesirable circumstance. It is devastating.


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.

Location: Stinson Beach, CA

Date: Saturday, November 10, 2018

Events: 10K, Half Marathon, 30K, 50K

Start Times:
     ● 50K – 7:00 AM
     ● 30K – 7:00 AM
     ● Half – 7:30 AM
     ● 10K – 7:30 AM

Check In & Bib Pickup:

     Fri., Nov. 9 1:00 PM – 6:00 PM
San Francisco Running Company – Mill Valley
247 Shoreline Highway
Mill Valley, CA 94941
(415) 450-7031
      Race Morning
Sat., Nov. 10
6:00 AM – 7:30 AM
Stinson Beach Park
Golden Gate National Recreation Area

Time Limit: There is an 8.5 hour time limit for the 50K race.

Parking: Parking is available within the Stinson Beach Day Use Area and is free of charge. Carpooling is always strongly encouraged.

Race Capacity: The Mt. Tam Trail Run will have a capacity of 600 runners, across all distances.

ITR Refund Policy:
Entry fees to our trail runs are non-refundable. With advanced notice, we are happy to transfer part of your entry fee (75% up to two weeks of the event, 50% from 2 weeks up to 72 hours of the event) to a future ITR event. Only registered runners can participate, and you cannot exchange your entry with another runner.

If a race is completely cancelled or rescheduled, we will transfer 100% of your entry fee to another ITR event. If a race location is changed due to park closures, we will automatically transfer the registration over to the new venue, or we will issue a 100% credit if cancellation is received by 7am on the Friday prior to the event.


50K (31.5 Miles with 6,800′ Elevation Gain)


30K (18.6 Miles with 4,200′ Elevation Gain)


Half Marathon (13.3 Miles with 3,050′ Elevation Gain)


10K (6.9 Miles with 1,650′ Elevation Gain)


Detailed Course Map | Turn by Turn Directions | Aid Station Distances and Cutoffs | Elevation Profiles

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 and chews, all-natural nutrition bars from Larabar, trail mix, pretzels, potato chips, Oreo cookies, Pop Tarts, boiled potatoes with salt, Coke, Mountain Dew, Ginger Ale, water, Tailwind Endurance Fuel, PB&J sandwiches, M&M’s, Mike & Ike’s, salt tablets, and tangerines. Aid stations are also equipped with general first aid items but no anti-inflammatory medicine. As distances between aid station vary, we strongly encourage all runners to carry at least one 20oz bottle during their run.

Tailwind is mixed so that it contains 180 – 200 calories per 20 fluid ounces.


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. Five hours of assisting an event results in a free race credit or Inside Trail merchandise.

To volunteer for this year’s event, please submit our online volunteer form.


Overall winners of each race distance will receive a medal, a custom glass Stein and a certificate for a pair of La Sportiva Mountain Running shoes.

Overall winners of the Half Marathon, 30K, and 50K will receive a gift card to San Francisco Running Company.

All ultra-marathon distance finishers will receive a custom printed Pint Glass with the race logo.

All other finishers will receive a custom medal 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 both males and females:
     ● 12 and under
     ● 13 – 19
     ● 20 – 29
     ● 30 – 39
     ● 40 – 49
     ● 50 – 59
     ● 60 – 69
     ● 70 and over


All registered runners will receive an A4 Cooling Performance Crew technical 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, the cooling 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.

Fabric: 4-Ounce polyester interlock features moisture wicking technology, odor resistance and stain release qualities designed to deliver maximum performance characteristics.

     ● 100% Polyester Interlock, 4.0 ounces per square yard
     ● Moisture wicking, Odor resistant, Stain release
     ● Ultra tight knit resists snagging
     ● UPF 30

To be guaranteed your shirt size, you must register by October 27, 2018.


Race Name Age Year Time
10K – Male Nick Handell 25 2017 48:05
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 Emily Peterson 29 2015 4:39:56

Mt. Tam | November 11, 2017

10K Overall
Half Marathon Overall
30K Overall
50K Overall


Mt. Tam | November 12, 2016

10K Overall
Half Marathon Overall
30K Overall
50K Overall
Mt. Tam Trail Run - 2016


Mt. Tam Trail Run | November 14, 2015

10K Overall
Half Marathon Overall
30K Overall
50K Overall
Mt. Tam Trail Run


Mt. Tam Trail Run | November 15, 2014

10K Overall
Half Marathon Overall
30K Overall
50K Overall
Mt. Tam Trail Run


Mt. Tam Trail Run | November 16, 2013

10K Overall
Half Marathon Overall
30K Overall
50K Overall
10K Age Group
Half Marathon Age Group
30K Age Group
50K Age Group

Mt. Tam Trail Run | November 11, 2012

10K Overall
Half Marathon Overall
30K Overall
50K Overall
10K Age Group
Half Marathon Age Group
30K Age Group
50K Age Group