Castro Valley, CA, United States · Saturday, September 26, 2026

Fixed Distance 100K

Dick Collins Firetrails 100 km

Race completed
100 km Distance
3,000 m Climbing
9.5 Grit · Elite / extreme
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37.6941° N, 122.0863° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 30 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.
Field size ~24 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 28°C
Night low 11°C
Rainfall Dry — rain unlikely
Daylight 12 h 03 m of light

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

Results history

Year Race Finishers Men's winner Women's winner
2025 100km 24 Rory Wilson · 11:08:03 Unknown Unknown · 10:56:46
2024 100km 13 Marko Cater · 11:52:14 Brianna Santos · 14:37:08
2021 100km 22 Steve Osborne · 12:32:09 Liz Garner · 13:43:02
2019 100km 31 Brett Maune · 10:17:42 Roxanne Vogel · 12:23:46
2018 100km 28 Alexander Kramer · 09:56:28 Ingrid Skorobohaty · 13:52:33
2017 100km 37 Ron Gutierrez · 10:16:29 Ingrid Skorobohaty · 13:31:32

The field grew 85% between 2024 (13) and 2025 (24). 33% of the 2025 field were women.

DUV results for the 2025 edition (100km) — 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

⛰️ terrain

This is a rolling course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert
👟 gear

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

By UltraHub Expert
🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail with 3,000 m of ascent.

  • Trail Running Shoes 30 m of climb per kilometre — grip and rock protection before cushioning.
  • Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
  • Hydration Vests Pole attachment and chest-strap stability on steep ground.
  • Trekking Poles 3,000 m of ascent to walk up.
  • Headlamps 100 km almost certainly means running into the night.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Salomon

Aero Glide 4 Grvl

$159.95 ★★★★★ 4.5

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Nathan

VaporKrar 12L

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

$170 ★★★★★ 4.6

LEKI

Ultratrail FX.One

Ultra-light carbon folding poles (135g each) designed for mountain ultra racing.

$200 ★★★★★ 4.6

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5
All gear guides →

Overview

The Dick Collins Firetrails 100 km, organized by Scena Performance, takes place in Castro Valley, CA, on September 26, 2026. This trail race covers a distance of 100 km with a total elevation gain of 3000 meters. With 30 meters of climb per kilometer, this race features more ascent than 38% of its 316 peer 100k races.

The course, held at Lake Chabot Marina, follows the classic Dick Collins Firetrails route. It includes an out-and-back section along the Nimitz Trail, followed by a descent down Conlon Trail to the intersection of Wildcat Creek Trail and Belgum Trail.

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