Castro Valley, CA, United States · Sunday, August 2, 2026

Fixed Distance 50K

Skyline 50k Endurance Run

Race completed

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.

37.6941° N, 122.0863° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 8 hours 9:36 min/km average. Comfortable. Room to walk the climbs and stop at aid. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 89% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~179 Mid-sized. Company early, well spread out by halfway.

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, August

Daytime high 29°C

Night low 11°C

Rainfall Dry — rain unlikely

Daylight 14 h 05 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 233 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2026	50km	179	Nick Reshetnikov · 03:52:06	Krista Drechsler · 04:44:02
2025	50km	151	Andrew Catanese · 03:52:05	Aiza Golledge · 05:11:50
2024	50km	159	Steven Kool · 03:42:14	Amanda Wiggenhorn · 04:57:56
2023	50km	137	David Tran · 04:03:21	Amanda Wiggenhorn · 04:18:49
2022	50km	197	Chikara Omine · 03:36:08	Kristina Randrup · 04:34:11
2021	50km	201	Steven Kool · 03:40:48	Kristina Vogt-Randrup · 04:16:44
2019	50km	167	Steven Kool · 03:43:37	Kristina Randrup · 04:28:33
2018	50km	160	Tim Comay · 03:44:03	Caroline Boller · 04:25:41
2017	50km	196	Sean Pont · 03:46:15	Yiou Wang · 04:07:59
2016	50km	169	Christopher Calzetta · 03:55:48	Jennifer Pfeifer · 04:46:22

The field grew 19% between 2025 (151) and 2026 (179). 32% 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.

Salomon

Sense Ride 5

RunRepeat found the Salomon Sense Ride 5 to have immaculate lockdown and a smooth and stable ride, making it confident on moderate trails and steep downhills. I…

★★★★★ 4.5

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

Sport Hydration Mix

Clean electrolyte drink mix with real fruit flavor. Low sugar.

$20 ★★★★★ 4.5

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

Suunto

Vertical

Titanium GPS watch with solar charging, offline maps, and 140-hour GPS battery.

$630 ★★★★★ 4.5

All gear guides →

Overview

The Skyline 50k Endurance Run, a trail race from Castro Valley, CA, has a field larger than 89% of 2664 comparable 50k races. This means runners can expect a busy course, particularly at the start, as the race runs from Lake Chabot Marina to Skyline Gate and back on a loop course.

With a time limit of 8 hours, the 50k distance demands a pace faster than 9.6 minutes per kilometer. This cutoff is tighter than 80% of 1022 peer 50k races, leaving less margin for error or extended breaks compared to most events of this distance.

Similar races

Other 50K trail ultras, closest in distance first.