Marin Ultra Challenge

WHEN: Saturday – March 12, 2016
View Larger Map
WHERE: Fort Baker, GGNRA
East Road & Sommerville Road
Sausalito, CA 94965
COST: 50 Mile: $125 / 50K: $85 / 25K: $60
CONTACT: Inside Trail Racing
Register Online Register By Mail

Add $10 if registering on or after February 20, 2016. Add $15 at check-in, if not sold out.
Pre-registration through 5:00 PM on March 10, or until sold out.

Race Info

Marin Ultra Challenge LogoThe Marin Ultra Challenge, our premier Marin County long distance trail race, delivers ample hills and sweeping descents. March 14th marks the 4th 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-$300, 2nd-$200, 3rd-$100. In addition, we will have special awards for the 25K and 50K distances and each age group. Don’t miss this grand tour of the ultra-running mecca, Marin County, California.

Starting just steps away from historic Fort Baker, in the shadow of the Golden Gate Bridge, runners may fill their lungs with fresh salt air before embarking on a journey through some of the best trails the Marin Headlands and Mt. Tamalpais has to offer, including the beautiful views of Coastal Trail, the inland buffed single track of the Miwok, descend on the famous Dipsea Trail and tackle one of the toughest climbs around – Willow Camp. You’ll travel along the coast, by Pirate’s Cove, to Muir Beach. Fron there you will cross over to Mt. Tam, climbing to the top of Cardiac Hill then scream down the Dipsea to Stinson Beach. Depart Stinson Beach with the 1,800′ of vertical gain in 1.8 miles on Willow Camp and traverse Mt. Tam along the single-track Coastal Trail, back to the top of Cardiac. Enjoy the tall trees as you pass through Muir Woods, before you climb back into the Headlands on Miwok to the killer downhill of Dias Ridge back to Muir Beach. From there, you’ll quietly pass through the Zen center and up the incredible new Middle Green Gulch hill. Your journey will ultimately end with amazing vistas of San Francisco and the Golden Gate Bridge from the SCA and Coastal trails… all the way back to the finish at Cavallo Point. Aid stations will be packed with all the goodies you love, plus a generous helping of delicious Clif Products!

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

Date: Saturday, March 12, 2016

Events:25K, 50K & 50 Mile

Check-In & Bib Pickup:

      Early Pickup
Thurs., March 10 &
Fri., March 11
2:00 PM – 6:00 PM
San Francisco Running Company
247 Shoreline Highway
Mill Valley, CA 94941
(415) 450-7031
      Race Morning
Sat., March 12
5:00 AM – 8:30 AM
Fort Baker
Golden Gate National Recreation Area
Start Times: 50 Mile 6:00 AM
50K 6:00 AM
25K 8:30 AM

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

Parking: Free parking is available adjacent to the Start/Finish area..

Race Capacity: The Marin Ultra Challenge will have a capacity of 500 runners, across all distances.

Weather Forecast for the Marin Headlands:

Partly Cloudy
Partly Cloudy
High 66°/Low 49°
Partly Cloudy
Partly Cloudy
High 67°/Low 48°
High 67°/Low 49°
High 71°/Low 53°


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.

Awards & Shirts


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

The top 3, male and female, finishers in the 50 Mile event will receive the following cash awards:
     ● 1st – $300
     ● 2nd – $200
     ● 3rd – $100

Additional prizes TBD.

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:
     ● 19 and under
     ● 20 – 29
     ● 30 – 39
     ● 40 – 49
     ● 50 – 59
     ● 60 – 69
     ● 70 and over



All registered runners will receive a Greenlayer Sports Evolution technical fabric shirt. Your favorite training tee has been updated for the new season. Made from super soft moisture-wicking fabric, the Evolution Short Sleeve Tee offers the perfect blend of performance, fit and design at an exceptional price point. The Greenlayer logo is featured in a color popping contrast color on the left sleeve.

Fabric: 150g 50% recycled polyester 50% polyester

To be guaranteed your shirt size, you must register by February 28, 2016.

50 Mile/50K

Course Map

Course design by Jim Vernon/The Endurables.

Miles 1 – 15 & Miles 39 – 50 / GGNRA

Miles 15 – 39 / Mt. Tamalpais State Park

All courses are subject to change if the weather or park service demands it.

50 Mile – Course Description

50 Mile – Turn by Turn Directions | 50 Mile – Aid Station Distances and Cutoffs

50K – Turn by Turn Directions | 50K – Aid Station Distances and Cutoffs

Sunrise for Sausalito, CA: 7:21 AM
Sunset for Sausalito, CA: 7:17 PM

Drop Bags and Headlamps
With the sunrise on March 15 being at 7:21 AM, all runners should start the 50 Mile and 50K races with a headlamp. Headlamps can be left at any aid station after they are no longer needed, and will be delivered to the S/F area by 10:00 AM. Any runner who expects to be running beyond 7:00 PM should also plan on having a headlamp in one of their drop bags.

Drop bags will be available at 2 different aid stations (which the 50 Mile will pass a total of 4 times):
1) Tennessee Valley AS: Mile 9.8
2) Cardiac AS: Mile 19.1
3) Cardiac AS: Mile 27.7
4) Tennessee Valley AS: Mile 44.2

All drop bags must be left at the designated spot near the Finish line by 5:45 AM.

Crew/Pacer Information
Runner crew is able to reach every aid station.

Pacers may join runners on their second pass through Cardiac Aid Station, mile 27.7.

Elevation Charts

Aid Station Supplies

At Inside Trail Racing aid stations it’s like an all you can eat buffet, but this is a race, so don’t linger too long. Expect to find variety at all of our aid stations, including a plethora of Clif Shot Gels, Clif Bars, and Gu Chomps as well as sweet and salty offerings like trail mix, pretzels, potato chips, Oreo cookies, Pop Tarts, boiled potatoes with salt, regular soda (Coke or Pepsi), Mountain Dew, Ginger Ale, water, Tailwind Endurance Fuel, PB&J finger sandwiches, M&M’s, Mike & Ike’s, salt tablets… you get the idea. There will also be 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.


Course Map

All courses are subject to change if the weather or park service demands it.

25K – Turn by Turn Directions

25K – Aid Station Distances and Timing

Elevation Charts

Aid Station Supplies

At Inside Trail Racing aid stations it’s like an all you can eat buffet, but this is a race, so don’t linger too long! Expect to find variety at our aid stations, including sweet and salty offerings like trail mix, pretzels, cookies, boiled potatoes with salt for dipping, Pepsi, Mountain Dew, water, Tailwind Electrolyte Drink, PB&J finger sandwiches, M&M’s, Mike & Ike’s, bananas, oranges, salt tablets, you get the idea. There will also be general first aid items but no anti-inflamatory medicine. We strongly encourage you to carry at least one 20oz water bottle to tide you over between aid stations.



Distance Name Age Year Time
50 Mile – Male Bob Shebest 39 2014 7:06:53
50 Mile – Female Tracy Bowling 34 2013 8:25:21
50K – Male Ryan Neely 23 2013 3:52:47
50K – Female Emily Richards 35 2015 4:15:36
25K – Male Galen Burrell 33 2015 1:39:40
25K – Female Tyler Stewart 36 2015 2:02:02