Portola Valley, CA, United States · Saturday, May 22, 2027

Fixed Distance 50K

Run for Amma 50 Km

234 days away

50 km Distance

not publishedn/a Climbing

2.5 est Grit · Entry level

Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.

37.3841° N, 122.2352° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~14 Tiny. You will run alone for most of it.

DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, May

Daytime high 15°C

Night low 10°C

Rainfall Dry — rain unlikely

Daylight 14 h 20 m of light

Regional 2001-2020 average for May — NASA POWER, grid elevation 66 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2026	50km	14	Alex Beauvais · 05:05:00	Mary Hanson · 05:38:00
2025	50km	16	Stuart Taylor · 04:44:28	Sarah Perry · 05:38:47
2024	50km	10	Kiran Krishnamurthy · 05:56:01	Jacqueline Barragan · 06:45:37
2022	50km	15	Ryan Neely · 03:44:16	N. N. · 04:55:47
2020	50km	19	Stuart Taylor · 04:36:33	Mandie Holmes · 05:08:48
2019	50km	3	Gary Maze · 06:28:35	—
2018	50km	17	Thomas Cunningham · 04:49:03	Heidi Andersen · 05:33:41
2016	50km	19	Tony Molfino · 05:05:00	Mandie Holmes · 05:36:00
2014	50km	6	Dan Nevo · 06:44:05	Lisa Kabot · 07:30:00

The field shrank 12% between 2025 (16) and 2026 (14). 29% of the 2026 field were women.

DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for 50 km of trail.

Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 50 km, without the bounce.
GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Adidas

Terrex Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 4.5

Skratch Labs