Big Alta 50K takes place on Fri, Mar 19, 2027 in San Rafael, United States. The main route is 50 km.
- Date
- Fri, Mar 19, 2027
- Start
- San Rafael 🇺🇸
- Distance
- 50 km
- Climbing
- 2,042 m
- Level
- Open to all
Your 23-week plan to Big Alta 50K
The Base phase starts this week. Built around your fitness and adjusted every day as your form changes; attach the course and it prepares for the climbs too.
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The Big Alta 50K is a demanding single-loop trail race through Marin County’s ridgelines, summiting Loma Alta and Big Rock Ridge and offering sweeping San Francisco Bay Area views.
Your road to race day
Race day at Big Alta 50K is 23 weeks away. This is how a coach divides that time. The first phase starts now.
01Base11 weeks · Oct 10, 2026 – Dec 25, 2026
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Dec 26, 2026 – Feb 5, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Feb 6, 2027 – Feb 26, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Feb 27, 2027 – Mar 12, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Mar 13, 2027 – Mar 19, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Frequently asked questions
When is Big Alta 50K?
Big Alta 50K takes place on Fri, Mar 19, 2027 in San Rafael, United States.
How long is Big Alta 50K?
The main route is 50 km.
How much climbing does Big Alta 50K have?
Big Alta 50K has 2,042 m of climbing.
Who is Big Alta 50K for?
Big Alta 50K is open to all participants.
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