This Event Took Place Sat. Jun 22, 2013

Race Description

The Marin Ultra Challenge, our premier Marin County long distance trail race, delivers ample hills and sweeping descents. March 11th marks the 6th edition of this tour of some of Marin’s best trails. Meticulous effort went into the design of each course for the MUC; all three distances are physically demanding (the 50 Mile has just about 11,000 feet of elevation gain) and exceptionally beautiful. The journey begins underneath the Golden Gate Bridge, then traverses the Marin Headlands, Stinson-facing Mt. Tamalpais and Muir Woods, exhibiting a range of terrain, from exposed fire-roads with incredible coastal and inland views to tight, technical single-track with redwood canopies. There is very little trail overlap, and Jim Vernon, from The Endurables and Hydrapak, spent hours and weekends developing these spectacular custom courses–we are super excited to show it off. You’ll quickly realize why Marin County has become a trail runner’s destination.

Since this is one of our favorite and most challenging events, we are offering a good little chunk of prize money in the 50 mile race. Male/Female 1st-$400, 2nd-$225, 3rd-$125. In addition, we will have special awards for the 50K distance and each age group. Don’t miss this grand tour of the ultra-running mecca, Marin County, California. We’ll also be raffling off a ton of goodies at the race, including gifts from La Sportiva, Farm to Feet, and Petzl.

Race Information

Location: Marin Headlands, GGNRA & Mt. Tamalpais State Park

Date: Saturday, March 11, 2017

Events:25K, 50K & 50 Mile

Bib & Shirt Pickup: 5:00 AM - 8:30 AM

Start Times:50 Mile6:00 AM
50K6:00 AM
25K8:30 AM

Time Limit: There is a 14.5 hour time limit for the 50K and 50 Mile race.

Course Information

50 Mile & 50K

Course Map

Miles 1 - 15 & Miles 39 - 50 / GGNRA

Miles 15 - 39 / Mt. Tamalpais State Park

50 Mile - Turn by Turn Directions

Elevation Charts


Course Map

Turn by Turn Directions

Elevation Charts


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 February 26, 2017.


Overall winners of each race distance will receive a medal, a custom glass Stein and an item from the ITR schwag bag.

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

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.

Local time: 12:45 AM


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Tim Stahler
Race Director

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