California · 50 Miler · 50K
Marin Ultra Challenge
Marin Ultra Challenge is a 50 Miler and 50K event held in Sausalito, California. Its next confirmed date is Saturday, March 13, 2027. About 500 runners take part across all distances.
- Race day
- March 13, 2027
- Location
- Sausalito, CA
- Field size
- ~500 runners
Race details
- Date
- Saturday, March 13, 2027
- Location
- Sausalito, California
- Distances
- 50 Miler, 50K
- Field size
- About 500 runners
- Course
- 50 Mile: 10,550 ft gain
- Registration
- ultrasignup.com
- Official website
- insidetrail.com
Registration, course & weather
- Registration status
- Open
- Start time
- 6:00 AM PST
- Course profile — 50 Mile
- Loop course; Trail surface; 10550 ft gain, 10550 ft loss (official course data); Not USATF certified
- Course profile — 50K
- Loop course; Trail surface; 6300 ft gain, 6300 ft loss (official course data); Not USATF certified
- Course profile — 50K
- Loop course; Trail surface
About the Marin Ultra Challenge
Inside Trail Racing's Marin Ultra Challenge sends runners on a 50-mile or 50K tour from Rodeo Beach through the Marin Headlands, Muir Woods and Mt. Tamalpais. The 50 Mile climbs about 10,550 feet.
More races in Sausalito
More upcoming races in California
-
Dia De Los Muertos Half Marathon & 5K Run/Walk (Bakersfield)Bakersfield, CAHalf Marathon5K2 Mile Speed Walk
Keep exploring
- All races in California
- 5Ks in California 459 upcoming races
- 10Ks in California 316 upcoming races
- Half Marathons in California 197 upcoming races
- Marathons in California 41 upcoming races
- March races in California
- Races in Arizona 172 upcoming races
- Races in Oregon 92 upcoming races
- Races in Nevada 71 upcoming races
Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 4 min read Diplo's Run Club 2026-27: Every City, Date and Course Diplo's Run Club is a 5K with a post-race concert. Every US date for 2026-27 (San Francisco, New York, Los Angeles, San Diego and Phoenix), start times and courses.
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Marin Ultra Challenge: common questions
- When is the Marin Ultra Challenge?
- The next confirmed date is Saturday, March 13, 2027.
- Where is the Marin Ultra Challenge held?
- In Sausalito, California.
- What distances does the Marin Ultra Challenge offer?
- 50 Miler and 50K.
- How many people run the Marin Ultra Challenge?
- About 500 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Marin Ultra Challenge?
- Registration is handled by the organiser at ultrasignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Marin Ultra Challenge?
- Yes — registration is open.
- What time does the Marin Ultra Challenge start?
- 6:00 AM PST.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.