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 12, 2022
Events: 10K, Half Marathon, 30K, 50K
Bib Pickup and Check-in: 6:30 AM – 8:00 AM
10K - 8:00 AM
Half Marathon - 8:00 AM
30K - 7:30 AM
50K - 7:30 AM
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 500 runners, across all distances.
Detailed Course Map | Turn by Turn Directions | Aid Station Distances and Cutoffs | Elevation Profiles
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, chews, and Stroopwafels, 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, bananas, watermelon, and tangerines. Aid stations are also equipped with general first aid items, including Salt-Stick tablets, but no anti-inflammatory medicine.
Tailwind is mixed so that it contains 180 – 200 calories per 20 fluid ounces.
As distances between aid station vary, we strongly encourage all runners to carry at least one 20oz bottle during their run.
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.
All registered runners will receive a 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.
● 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 your shirt size, you must register by October 29, 2022.
The top three overall winners (male and female) of each race distance will receive a custom trophy with the race logo. In addition, the top finisher for each distance (male and female) will receive a special item from one of Inside Trail’s sponsors.
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 both males and females:
● 13 and under
● 14 – 19
● 20 – 29
● 30 – 39
● 40 – 49
● 50 – 59
● 60 – 69
● 70 and over
The Fine Print
Entry fees to our trail runs are non-refundable, and we do not offer transfers or deferrals to future races. However, with advanced notice, we are happy to credit part of your entry fee to a future Inside Trail Racing event. A credit worth 50% of your original race fee will be issued if the cancellation is received at least 3 weeks prior to the race. There will be no credits or refunds provided if a cancellation is made within 3 weeks of the race. Only registered runners can participate, and you cannot exchange your entry with another runner. Credits will be available for 1 full year from its issue date.
Local time: 2:12 AM
Only registered runners can participate, and you may not exchange your entry with another individual.
We do not cancel races due to rain or heat. Due to trail work, closures, "Acts of God", 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 or credits in such a situation. If a race location is changed due to park closures, we will automatically transfer the registration over to the new venue, or entrants may choose to cancel their entry (non-refundable and non-transferable) and we will mail awards.
Hosting a trail running event is an expensive and risky endeavor. All race costs are paid for well in advance of race day, so there is no financial gain to be made if a person does not show up on race day. We want all of our registered runners to show up, run, and have fun. While we understand that injuries, conflicts, emergencies, deaths, and other unfortunate events happen and may impact your plans for participation, we must adhere to our cancellation policies.