Marin Ultra Challenge

WHEN: Saturday – March 9, 2019
WHERE: Rodeo Beach, GGNRA
11050 Mitchell Road
Sausalito, CA 94965
COST: 50 Mile: $160 / 50K: $95 / 25K: $70
CONTACT: Inside Trail Racing
(415) 320-6220
Register Online Register By Mail

Add $10 if registering on or after February 9, 2019. Add $15 at check-in, if not sold out.
Pre-registration through 5:00 PM on March 6, or until sold out.


The Marin Ultra Challenge, our premier Marin County long distance trail race, delivers ample hills and sweeping descents. March 9th marks the 8th 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 at the black sands of Rodeo Beach, and 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 the ultimate trail runner’s destination.

Location: Marin Headlands, Muir Woods, &
                Mt. Tamalpais State Park

Date: Saturday, March 9, 2019

Events: 25K, 50K & 50 Mile

Start Times: 25K, 50K & 50 Mile

     ● 50 Mile – 6:30 AM
     ● 50K – 6:30 AM
     ● 25K – 8:00 AM

Check-In & Bib Pickup:

      Early Pickup
Thurs., March 7 & Fri., March 8
1:00 PM – 6:00 PM
San Francisco Running Company
247 Shoreline Highway
Mill Valley, CA 94941
(415) 450-7031
      Race Morning
Sat., March 9
5:30 AM – 8:30 AM
Rodeo Beach – Start/Finish Area
Golden Gate National Recreation Area

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

Parking: Free parking is available in the surrounding areas to the Start/Finish at Rodeo Beach. Runners may utilize the pullouts along Mitchell Road, along the beach, the annex lot below the Marine Mammal Center, and the Smith Road Parking Lot (Gerbode Valley Trailhead) along Bunker Road. The walk from the Marine Mammal Center lot to the Start/Finish is about 1/3 mile. In addition, we will have shuttles running between Smith Road and Rodeo Beach all day. 25K runners should expect to park in the Smith Road lot, so please plan your arrival time accordingly.

Remote parking area map:

Race Capacity: The Marin Ultra Challenge will have a capacity of 600 runners, across all distances.

Before Your Run:
Select Medical of San Francisco will be offering a blanket area for foam rolling, stick rolling, stretching straps, and kinesio taping services before the 25K race. Stop by their pre-race therapy area to ensure you are ready to run!

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. Because of the magnitude of this race, a credit worth 50% of your original race fee will be issued if the cancellation is received at least 2 weeks prior to the event. There will be no credits or refunds provided if a cancellation is made within 2 weeks of the race. 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.


Starting at Fort Cronkhite and Rodeo Beach, 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. Your journey will begins with amazing vistas of San Francisco and the Golden Gate Bridge from the SCA and Julian trails. You’ll soak in 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 then traverse through the Headlands all the way back to the finish at Rodeo Beach.

50 Mile (50.2 Miles with 10,550′ Elevation Gain)


50K (31.0 Miles with 6,300′ Elevation Gain)


Detailed Course Maps

Miles 1 – 15 & Miles 39 – 50 / Marin Headlands Miles 15 – 39 / Mt. Tam & Muir Woods

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

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

Elevation Charts

Sunrise for Sausalito, CA: 6:25 AM
Sunset for Sausalito, CA: 6:15 PM

Drop Bags and Headlamps
With the sunrise on March 9 being at 6:25 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 6:30 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, 50K runners will pass 2 times):
1) Tennessee Valley AS: Mile 10.5
2) Cardiac AS: Mile 19.8 (50 Mile Only)
3) Cardiac AS: Mile 29.3 (50 Mile Only)
4) Tennessee Valley AS: Mile 45.8

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, but must abide by posted parking rules. There is no parking available at the Deer Park Aid Station. Crew must hike 1/2 miles to reach the Cardiac Aid Station.

Pacers may join runners at any time after their second pass through Cardiac Aid Station, mile 29.3.


25K (15.8 Miles with 3,500′ Elevation Gain)


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 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 custom MUC award from Elevation Culture.

The top 3, male and female, finishers in the 50 Mile event will receive a custom trophy, a pair of La Sportiva Mountain Running shoes as well as the following cash awards:
     ● 1st – $500
     ● 2nd – $250
     ● 3rd – $150

The top 3, male and female, finishers in the 50K event will receive a custom trophy, and a pair of La Sportiva Mountain Running shoes.

The top 3, male and female, finishers in the 25K event will receive a custom trophy, and pair of La Sportiva Mountain Running shoes.

All ultra-marathon distance finishers will receive a medal and a custom printed drinking 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 February 23, 2019.


Distance Name Age Year Time
50 Mile – Male Ryan Neely 26 2016 6:39:38
50 Mile – Female Kimberly O’Donnell 26 2016 8:23:12
50K – Male Jeff Mogavero 24 2018 3:42:51
50K – Female Emily Richards 35 2015 4:15:36
25K – Male David Roche 27 2016 1:33:21
25K – Female Danielle Moreno 23 2016 1:46:55

Marin Ultra Challenge | March 10, 2018

25K Overall
50K Overall
50 Mile Overall


Marin Ultra Challenge | March 11, 2017

25K Overall
50K Overall
50 Mile Overall
MUC 2017


Marin Ultra Challenge | March 12, 2016

25K Overall
50K Overall
50 Mile Overall
Marin Ultra Challenge Logo


Marin Ultra Challenge | March 14, 2015

50 Mile Overall
50K Overall
25K Overall
Marin Ultra Challenge


Marin Ultra Challenge | March 15, 2014

50 Mile Overall
50K Overall
35K Overall
Half Marathon Overall
50 Mile Age Group
50K Age Group
35K Age Group
Half Marathon Age Group

Marin Ultra Challenge | June 22, 2013

50K Overall
50 Mile Overall
50K Age Group
50 Mile Age Group

Marin Ultra Challenge | June 30, 2012

50K Overall
50 Mile Overall

50K Age Group
50 Mile Age Group