Date
Sat, 13 Mar 2027
Start
06:00
Venue
Rodeo Beach, 11050 Mitchell Road, Sausalito, CA 94965
Sausalito, Marin County
Countdown
March
The long one: 50 miles in one big loop out of Sausalito, starting in the dark so you watch the sun come up on the trail. A proper day out, with 14 hours to get it done.
Key facts
01Headlamp needed: the 06:00 start is before sunrise
0214-hour cut-off for the full loop
03Single loop, so no looping back past the start
Create a free training plan for the Marin Ultra Challenge 81 km
7-day free trial, no card required
The course
The route
Sausalito
Distance81km
Total climb3,215m
StartElevation
0 kmDrag map to rotate64.7 km
Weather
Mid-March, Sausalito
15°CTypical high
8°CTypical low
1°CColdest in 20 years
31%Days with rain
Highs around 15°C and lows around 8°C, but it has dropped to 1°C. Rain on 31% of days.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
Training
Training for the Marin Ultra Challenge 81 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Marin Ultra Challenge 81 km plan targets
Typical sessions
81 km with 3,215 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Hill reps and vert to prepare the climbs and descents
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Marin Ultra Challenge 81 km plan.
7-day free trial, no card required.
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