The Big Alta
Mar 19, 2027Marinwood, CA50K
Also 50K, 71 mi from Sierra Azul Trail Challenge, registration open
At a glance
- Last held
- Apr 18, 2026
- Next edition
- 2027 date not announced. Usually held in April.
- Location
- San Jose, California
- Distances
- 50K, Marathon, 20 mi, Half Marathon, 7 mi, 5K
- Aid stations
- 5
Listed from UltraSignup. Checked Apr 5, 2026.
Plan this race for free
5 aid stations are already loaded. Add cutoffs, pacing and the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planAbout this race
Run in the shadow of the infamous Mt. Umunhum. Set in the Sierra Azul Open Space Preserve, this is one of the toughest trail races hosted, providing unique access to gorgeous trails and scenery not viewed by many.
Key dates
Race day
Apr 18, 2026
Pricing
50K
Race Day
$125
All distances
50K
$115
Trail Marathon
Race Day
$115
20 Mile
Race Day
$105
Half Marathon
Race Day
$95
7 Mile
Race Day
$80
5K
Race Day
$65
Email me updates about Sierra Azul Trail Challenge
Registration openings and major changes, like a new date or a cancellation.
Aid stations
5| Station | Distance | Crew | Drop bags | Cutoff | Supplies |
|---|---|---|---|---|---|
Hacienda Start/Finish Start/finish line with toilets available | 0.00 miles | 6:00 PM | waterGatoradesodachips+5 | ||
Woods Aid Station Toilets available | 3.50 miles | 5:00 PM | waterGatoradesodachips+5 | ||
Woods Trail/Barlow Rd Water Stop Water stop only | 6.60 miles | -- | water | ||
Kennedy Aid Station At Kennedy/Woods/Limekiln trails intersection | 10.00 miles | 3:30 PM | waterGatoradesodachips+5 | ||
Priest Rock Aid Station At Priest Rock/Limekiln trails intersection | 13.00 miles | 2:30 PM | waterGatoradesodachips+5 |
Entry transfers
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
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