Calero Run 50K

Race completed

50 km Distance

1,600 m Climbing

4.9 Grit · Challenging

37.3394° N, 121.8950° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 32 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 12 hours 14:24 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 70% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~1 Tiny. You will run alone for most of it.

DUV results for the 2025 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 21°C

Night low 8°C

Rainfall Dry — rain unlikely

Daylight 14 h 31 m of light

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

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	50km	1	Warrick Leung · 07:24:59	—
2024	50km	7	Steffan Skorstad · 05:37:46	Brittany Demario · 05:52:30
2023	50km	5	Sean Dempsey · 06:25:17	—
2022	50km	6	Travis Nutter · 06:30:46	Juliana Gomes-Hughes · 07:01:10
2019	50km	1	—	Tara Beaton · 07:16:48
2017	50km	5	Mike Anderson · 06:09:00	Tatsiana Lahunovich · 07:30:25
2016	50km	14	Kermit Cuff · 05:37:33	Jennifer Zakroff · 07:30:25
2015	50km	3	Moises Avila · 06:09:46	—
2014	50km	3	Jim Hinch · 07:01:30	—
2013	50km	13	Kevin Thayer · 05:00:08	Lauren Menor · 06:28:52

The field shrank 86% between 2024 (7) and 2025 (1). 0% of the 2025 field were women.

DUV results for the 2025 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

⛰️ 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

Gear for this race

Chosen for 50 km of trail with 1,600 m of ascent.

Trail Running Shoes 32 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 1,600 m of ascent to walk up.
Headlamps A 12 h limit puts you out there after dark.

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

Brooks

Catamount 3

RunRepeat found the Brooks Catamount 3 to have a cozier upper that enhances the overall fit, though breathability and durability could be better. iRunFar noted…

★★★★★ 4.5

Spring Energy