Lake Sonoma 100K, 50K & TS Half
Apr 10, 2027Healdsburg, CA100K, 50K +1
100K, 9 weeks before race day, 71 mi away
Bay Area 100
- Entry
- $450
- Aid stations
- 4
- Days to go
- 233
At a glance
- Date
- Jun 12, 2027
- Location
- Berkeley, California
- Distances
- 100 mi
- Elevation gain
- 18,000 ft
- Aid stations
- 4, 4 with crew access
- Registration
- Closes Dec 8, 2027, via ultrasignup.com
Listed from UltraSignup. Checked Oct 18, 2026.
Plan this race for free
4 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
The Bay Area 100 is a point-to-point 100-mile ultramarathon through California's East Bay hills, starting at UC Berkeley Memorial Stadium and finishing at Skyline High School in Oakland. With 18,000ft of vertical gain, runners traverse dramatic ridgelines, redwood forests, and lakeshores.
Key dates
Race day
Jun 12, 2027
Registration closes
Dec 8, 2027
Pricing
Current price
$450
Price after Dec 11
Price progression
Registration
$425
Price after Dec 11
$450
Email me updates about Bay Area 100
Registration openings and major changes, like a new date or a cancellation.
Aid stations
4| Station | Distance | Crew | Drop bags | Cutoff | Supplies |
|---|---|---|---|---|---|
Lake Chabot Aid Crew aid station. Park closes at 10:00 PM to traffic; crews arriving afterward must park on the street and walk into the park. | 60.75 miles | -- | -- | ||
Bort Meadow Aid Designated crew aid station; car access must be reserved or crew/pacers must be dropped off. | 68.05 miles | -- | -- | ||
Bort Meadow Aid Designated crew aid station; car access must be reserved or crew/pacers must be dropped off. | 82.95 miles | -- | -- | ||
Bort Meadow Aid Designated crew aid station; car access must be reserved or crew/pacers must be dropped off. | 97.50 miles | -- | -- |
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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Race planning
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