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Ultras · US · CA

Marin Ultra Challenge

50 Miler · 50 Mile
Registration open
Registration is open on UltraSignup.
Race dateMarch 13, 2027
Start6:30am
Whenin 140 days

Who's going to Marin Ultra Challenge?

I'm running itPlan your weeks and your aid station times I'm crewingWhen to leave, where to park, at every stop I'm pacing or cheeringAsk your runner for their Out Here link

Free. You can start with nothing.

Official website Entry Aid stations Crew access Notify me if this race changes
Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance The race
50 Mile
Climb
11,330 ft
Descent
11,330 ft
High point
not checked yet
Time limit The race
14:00:00
Aid stations
11
Started
not checked yet
Finished
not checked yet
Finish rate
not checked yet
The course

Where it goes loop · 11 aid stations · rust marks a stop your crew can reach

Course line from the race's own GPX. Source file. Recorded 2017.

Starts and ends at Rodeo Beach. The route passes Tennessee Valley, Muir Beach and Cardiac Hill twice, with Conzelman, Willow Camp and Deer Park in between, and finishes back at the beach.

The race

What this one is

A 50 Mile and a 50K that start and finish at Rodeo Beach in the Marin Headlands, with a route through the Golden Gate National Recreation Area, Muir Woods and Mt. Tamalpais State Park. Exposed fire roads with coastal and inland views, tight technical singletrack under redwoods, and a lot of hills.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery
not checked yet
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
not checked yet
Registration
UltraSignup ultrasignup.com
Qualifying
not checked yet
Minimum age
not checked yet
Transfers
No ultrasignup.com
Deferrals
not checked yet
Crew access, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed
Yes insidetrail.com
Vehicles per runner
not checked yet
Pacers
Yes, from mile 29.30 insidetrail.com
Muling
not checked yet
Drop bags
Yes insidetrail.com
Cupless
Yes insidetrail.com
Course marking
Fully Marked insidetrail.com
Night running
not checked yet
Dogs
Not allowed insidetrail.com
Headphones
Allowed insidetrail.com
Crew rules
Crew may help only within 30 meters of an aid station and must follow the parking rules and instructions at each one. Crew can reach every aid station except Deer Park. insidetrail.com
Pacer rules
Pacers can join on the 2nd pass at Cardiac, Muir Beach and Tennessee Valley aid stations. Every pacer signs a waiver and wears a pacer bib. Pacers cannot carry or give the runner any nutrition, hydration or other event needs. insidetrail.com
Drop bag rules
Drop bags go to Tennessee Valley (mile 10.5 and 45.8) and Cardiac (mile 19.8 and 29.3) only. Drop them at the start/finish by 6:30 AM, labeled with bib number and last name. insidetrail.com
Cutoff philosophy
Hiking is part of the race: most runners, including some elites, hike the big hills. Walk or even crawl to the finish, as long as you reach each aid station before its cutoff. insidetrail.com
Aid stations

Every stop, and what you get there ● yes   ○ no   ? nobody has checked   – does not apply to this race

Mile Station Cutoff Crew access Bag Pacer Med To next
0.00 Start (Rodeo Beach)
NoneSignal wrong?
 ? ? ? ? ? 5.80
5.80 Conzelman
NoneSignal wrong?
 8:00am ● ○ ? ? 4.70
10.50 Tennessee Valley
NoneSignal wrong?
 9:25am ● ● ? ? 4.20
14.70 Muir Beach
NoneSignal wrong?
 10:35am ● ○ ? ? 5.10
19.80 Cardiac Hill
NoneSignal wrong?
 12:05pm ● ● ? ? 3.60
23.40 Willow Camp
NoneSignal wrong?
 1:05pm ● ○ ? ? 5.90
29.30 Cardiac Hill
NoneSignal wrong?
 2:45pm ● ● ● ? 6.60
35.90 Deer Park
NoneSignal wrong?
 4:35pm ○ ○ ? ? 4.90
40.80 Muir Beach
NoneSignal wrong?
 5:55pm ● ○ ● ? 5.00
45.80 Tennessee Valley
NoneSignal wrong?
 7:20pm ● ● ● ? 4.20
50.00 Finish (Rodeo Beach)
NoneSignal wrong?
 8:30pm ? ? ? ? ?
Driving your crew

Getting your people there 9 stops with directions the race published.

Conzelman mile 5.80 cutoff 8:00am

Head east on Mitchell Road 0.5 mi; Merge onto Bunker Rd. 1.8 mi; Turn right on McCullough Road 0.9 mi; At the traffic circle enter parking area 0.0 mi. The trip takes 3.2 miles and about 9 minutes. Destination: Intersection of Coastal Trail and Conzelman Road parking area.

insidetrail.com
Tennessee Valley mile 10.50 cutoff 9:25am

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on to Alexander Ave 0.2 mi; Turn left and merge on to US-101 North 3.6 mi; Take exit #445B CA-1 Mill Valley/Stinson Beach onto Highway 1 (CA-1) 0.7 mi; Bear left onto Tennessee Valley Rd. 0.1 mi; Bear right to stay on Tennessee Valley Rd. 0.2 mi; Bear left to stay on Tennessee Valley Rd. 1.3 mi. The trip takes 10.5 miles and 24 minutes. Destination: Tennessee Valley Trailhead.

insidetrail.com
Muir Beach mile 14.70 cutoff 10:35am

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on Alexander Ave. 0.2 mi; Take left ramp on to Redwood Hwy (US-101 N) toward Eureka. 3.5 mi; Take exit #445B CA-1/Mill Valley/Stinson Beach onto Highway 1 (CA-1) 1.0 mi; Turn Left to stay on CA-1 N 5.7 mi; Turn left on to Pacifica Way 0.2 mi. The trip takes 14.5 miles and 35 minutes. Destination: Muir Beach Parking Area.

insidetrail.com
Cardiac Hill mile 19.80 cutoff 12:05pm

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on to Alexander Ave. 0.2 mi; Take left exit on to US-101 N 3.6 mi; Take exit 445B for CA-1 towards MV/Stinson Beach 0.2 mi; Continue onto CA-1 N 0.8 mi; Turn left to stay on CA-1 N 2.6 mi; Turn right on to Panoramic Highway 5.3 mi; Turn left in to Pantoll Ranger Station Parking Lot 0.0 mi. The trip takes 17.1 miles and 40 minutes. Destination: Pantoll Ranger Station.

Parking. All cars must park in the Pantoll Campground area and follow all parking rules and regulations. Hike the fire road or Old Mine down to the aid station (1/4 mile).

insidetrail.com
Willow Camp mile 23.40 cutoff 1:05pm

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on to Alexander Ave. 0.2 mi; Take left exit on to US-101 N 3.6 mi; Take exit 445B for CA-1 towards MV/Stinson Beach 0.2 mi; Continue onto CA-1 N 0.8 mi; Turn left to stay on CA-1 N 2.6 mi; Turn right on to Panoramic Highway 8.9 mi; Turn right on to CA-1 N 0.3 mi; Turn right onto Calle del Mar. 305 ft; Turn right onto Buena Vista Ave. 193 ft; Bear left onto Laurel Ave. 0.1 mi; Bear left onto Belvedere Ave. 0.2 mi; Turn right onto Avenida Farralone. 0.1 mi. The trip takes 21.5 miles and 50 minutes. Destination: Entrance to Willow Camp Fire Road on Avenida Farralone.

insidetrail.com
Cardiac Hill mile 29.30 cutoff 2:45pm

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on to Alexander Ave. 0.2 mi; Take left exit on to US-101 N 3.6 mi; Take exit 445B for CA-1 towards MV/Stinson Beach 0.2 mi; Continue onto CA-1 N 0.8 mi; Turn left to stay on CA-1 N 2.6 mi; Turn right on to Panoramic Highway 5.3 mi; Turn left in to Pantoll Ranger Station Parking Lot 0.0 mi. The trip takes 17.1 miles and 40 minutes. Destination: Pantoll Ranger Station.

Parking. All cars must park in the Pantoll Campground area and follow all parking rules and regulations. Hike the fire road or Old Mine down to the aid station (1/4 mile).

insidetrail.com
Deer Park mile 35.90 cutoff 4:35pm

Parking. There is no parking here for crews or pacers. You MUST HAVE a permit to park within the Muir Woods National Monument area. Crews can park at Muir Beach and hike up or skip this aid station all together.

Muir Beach mile 40.80 cutoff 5:55pm

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on Alexander Ave. 0.2 mi; Take left ramp on to Redwood Hwy (US-101 N) toward Eureka. 3.5 mi; Take exit #445B CA-1/Mill Valley/Stinson Beach onto Highway 1 (CA-1) 1.0 mi; Turn Left to stay on CA-1 N 5.7 mi; Turn left on to Pacifica Way 0.2 mi. The trip takes 14.5 miles and 35 minutes. Destination: Muir Beach Parking Area.

insidetrail.com
Tennessee Valley mile 45.80 cutoff 7:20pm

Head east on Mitchell Road 0.5 mi; Merge on to Bunker Road 3.5 mi; Turn right on to Alexander Ave 0.2 mi; Turn left and merge on to US-101 North 3.6 mi; Take exit #445B CA-1 Mill Valley/Stinson Beach onto Highway 1 (CA-1) 0.7 mi; Bear left onto Tennessee Valley Rd. 0.1 mi; Bear right to stay on Tennessee Valley Rd. 0.2 mi; Bear left to stay on Tennessee Valley Rd. 1.3 mi. The trip takes 10.5 miles and 24 minutes. Destination: Tennessee Valley Trailhead.

insidetrail.com
Same race, other lines

Other distances and other years

Other distances
50K (30.8 miles)
What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

3 people have been out there with a camera or a microphone.

Social account

Inside Trail Racing

Social account
Social account

Inside Trail Racing

Social account
Official channel

Inside Trail Racing

Official channel
All (3) Official channel (1) Social account (2)

These are other people's work and we link straight to them. Watching costs nothing and needs no account. More of them: every race we hold, on film.

Add to this page

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Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

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Where this came from. Every fact on this page records its source and when we last checked it: 138 sources for this race. Hover a source link to read the sentence it came from.
39% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Were you out there? Say which stops a text got out from
Got footage of this course? Send us the link
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Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.