Diablo Trail Run

Diablo Trail Run

Sun September 6, 2026

Clayton, CA 94517 US

Events:

• 4 Mi: Price: $43.40 incl. $3.40 Fee. Time: 8:15AM PDT. Price increases after August 30, 2026.
• 10 Mi: Price: $54 incl. $4 Fee. Time: 8:00AM PDT. Price increases after August 30, 2026.
• Half Marathon: Price: $64.60 incl. $4.60 Fee. Time: 8:00AM PDT. Price increases after August 30, 2026.
• Marathon: Price: $75.20 incl. $5.20 Fee. Time: 8:00AM PDT. Price increases after August 30, 2026.
• 50K: Price: $85.80 incl. $5.80 Fee. Time: 8:00AM PDT. Price increases after August 30, 2026.
• Kid's Run (6yo & younger, 50yd dash): Free! Time: 7:50AM PDT. Registration ends September 6, 2026.
• Coastal Testing: Free! Time: 8:25AM PDT. Registration ends September 6, 2026.

Place

Diablo State Park (Mitchell Canyon Trailhead)
96 Mitchell Canyon Road
Clayton, CA US 94517

Description

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.)

Bib Number & Shirt Pick-up

Race Day: Check-in beginning at 7:00 a.m. at Mt. Diablo State Park (Mitchell Canyon Trailhead). Please arrive 45min before your event to receive your bib and shirt. Event start times are listed here. Parking is $6 per vehicle. Please bring exact change to expedite entry.

No Bag Check

You can leave non-valuables at the Start/Finish.

Shirts

To guarantee a shirt, please register 10 business days prior to the event.

Time Limit & Cut-off

• Marathon - 9 hours (3 hrs, 11:00 a.m. @ 9 mi)
• 50K - 9 hours (2 hrs 45 min, 10:45 a.m. @ 9 mi; 6 hrs 35 min, 2:35 p.m. @ 21 mi)
• All Events - 9 hours

Course

The course will be marked with ribbon approximately every 200 yards and color coded. The most important course marking is the polka-dot flagging, indicating a turn. Blue ribbons indicate the wrong way. If you get off course, retrace your path. Please be courteous on the trail. Announce "on your left" when passing. Headphones are allowed on dirt road sections only.

Aid Stations

Fully-stocked aid stations every 3 - 5 miles. You can expect fresh fruit, salty snacks, assorted candy, water, and Skratch electrolyte sports drink. It is highly recommended that runners carry at least 20 oz. of water between aid stations.

Cupless

In an effort to reduce waste and litter, Coastal/Zoom events are cupless. Bring your preferred means of containing fluids. Hydrapak SpeedCups will be for sale. No pre-filled cups of hydration at aid stations.

Results

We use state-of-the-art Bibtags by MyLaps to accurately time each runner’s finish time. Results are published on the website every 30 minutes.

Awards

T-shirts for pre-registered runners. All finishers receive a custom medal. 50K finishers also receive a custom coaster. Top 3 male and female overall winners of every distance receive awards and race credits. Top three finishers in each age group and gender receive award medals.