Race Discovery
Diablo Trail Run
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Diablo Trail Run

Clayton, California, United States View on map
May 23, 2027 (America/Los_Angeles local time)
Trail running

About this race

Mount Diablo provides spectacular views of the San Francisco Bay Area and surrounding valleys.  The 4 mile course is relatively flat and fast within Mitchell Canyon.  The longer events are mountainous and very scenic. (Distances are accurately measured using a Rolatape® surveyor's measuring wheel.)

Pick your distance

Trail running

4 Mi

May 23, 2027 6.4K 8:15 AM
$50.00
Open

10 Mi

May 23, 2027 16.1K 8:00 AM
$60.00
Open

Half Marathon

May 23, 2027 Half-Marathon 8:00 AM
$70.00
Open

Marathon

May 23, 2027 Marathon 8:00 AM
$80.00
Open

50K

May 23, 2027 48.9K 8:00 AM
$90.00
Open

Running

Kid's Run (6yo & younger, 50yd dash) - Free!

Kids 6 yo & younger

May 23, 2027 Kid's Run (6yo & younger, 50yd dash) - Free! 7:50 AM
Free
Open

Coastal Testing

May 23, 2027 3.2K 8:25 AM
Free
Open

Typical race-day weather

Based on 6 years of Open-Meteo archive data for this event's race dates in Clayton, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) 14.7° / Maximum temperature (race-week average) 27.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 14.7° / Maximum feels like — heat index / wind chill (race-week average) 28.6°
Peak wind (km/h)
Strongest wind of the day (race-week average)
18.3
Precip (mm)
Precipitation over the day (race-week average)
0.7mm
Humidity
Mean relative humidity (race-week average)
61.9%
Sunrise
Sunrise at the start line on May 23, 2027 (PDT)
Sunset
Sunset at the start line on May 23, 2027 (PDT)
Daylight
Hours between sunrise and sunset on race day
14h 26m

The sun rises at 5:51 AM and sets at 8:17 PM local time (PDT) in Clayton on May 23, 2027 — 14h 26m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

Reviews

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Results — Diablo Trail Run

2026 edition View Results
2025 edition View Results
2024 edition View Results
2023 edition View Results
2022 edition View Results

Other races near Clayton

Different organizers, within 40 miles, in the next three months

Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 1 Clayton event

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