Diablo Trail Run

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Get out for a beautiful Mount Diablo running event this August. With running options ranging from 4 miles right up to 50k runners of all stripes will be able to find something for them. Grab your shoes and hit the trail for that awesome finisher's medal and t-shirt.
50k, 4 Mile, 10 Mile, and 2 more
View details
Sun, Sep 18, 2022
View logistics
Clayton, United States
View location
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The event experience

Based on location


20 to 50m elevation gain per km

Where and when
96 Mitchell Canyon Rd, Clayton, CA 94517, USA
Start times
Sun, Sep 18, 2022
8:00am |
4 Mile:
8:15am |
10 Mile:
8:00am |
Half Marathon:
8:00am |
Races summary
Here's what races are available for Diablo Trail Run
1 / 2
4 Mile
$35.00 - $40.00
10 Mile
$45.00 - $50.00
Half Marathon
$55.00 - $60.00
$65.00 - $70.00
Route information
Get out for a stunning run up Mount Diablo this August. This is the perfect way to round out your summer and enjoy the beautiful views of the Bay Area and Mitchell Canyon. There will be a FREE Kids Fun Run at 7:50am!
If you are looking for an easier route with less hill climbing then perhaps the 4 miler is for you, but if you are looking for a bit more of a challenge then consider signing up for the half marathon (or even the 50k).
The course takes place largely on a dirt road up the side of the mountain, there will be portions of this race that will be on single track.
The 4 and 10 mile races will have between 400 - 2,400 feet of elevation gain, whilst the longer runs will range from 3,420 - 7,990 feet of elevation gain. These hills are not to be scoffed at so you better include some hill training in your schedule.
There will be fully-stocked aid stations every 3 - 5 miles. You can expect fresh fruit, salty snacks, assorted candy, water, and Clif Shot Electrolyte sports drink. It is highly recommended that runners carry at least 20 oz. of water between aid stations.
The course will be marked with ribbon approximately every 200 yards and color coded as follows:
  • 4 mile – Yellow (out/back along Mitchell Canyon)
  • 10 mile – Orange (turnaround at Juniper, 1st aid station)
  • Half Marathon – Orange (turnaround at Summit)
  • Marathon – Orange + Green Summit Loop + Pink Loop + Orange to Finish
  • 50k – Orange + Green Summit Loop + Pink Loop + Green Summit Loop (on return at 21 miles) + Orange to Finish
Course Surfaces
4 mile - (Elevation Gain 400', 100% Dirt Road)
10 mile - (Elevation Gain 2.420', 100% Dirt Road)
Half Marathon - (Elevation Gain 3,420', 21% Single Track, 76% Dirt Road, 3% Asphalt)
Marathon - (Elevation Gain 6,760', 28% Single Track, 70% Dirt Road, 2% Asphalt)
50k - (Elevation Gain 7,990', 38% Single Track, 60% Dirt Road, 2% Asphalt)
Organizer route images
What's included
  • Finisher's medal
  • Event T-Shirt
  • Refreshments and Aid Stations
  • Professional chip timing
  • 50k finisher's will also receive a custom coaster
  • Cash prize for the Top 3 (M & F) in all distances: 1st - $50, 2nd - $35, 3rd - $20
How to get there
96 Mitchell Canyon Rd, Clayton, CA 94517, USA
Get full directionsExternalLink
By Car
Exit Ygnacio Valley Rd/Kirker Pass Rd onto the Clayton Rd and follow until you reach Mitchell Canyon Rd, turn left and follow the road until you reach the event.
There will be parking available at the event.
Event day logistics
7am Bib Number & Shirt Pick-Up at Mitchell Canyon Trailhead
7:50am FREE Kids Fun Run starts
8am 50k, Marathon, Half Marathon and 10 mile start
8:15am 4 mile starts
5pm Marathon & 50k cut off time
Please make sure you arrive with enough time to get parked, registered and warmed up before taking on this epic challenge.
Time Limits
The Marathon & 50k both have a cut off time of 9 hours.
Headphones are allowed on dirt road sections only. Please do not wear headphones on single-track trail, while crossing paved roads, when getting aid at aid stations, or while crossing the finish line.
Course Markings
The most important markings along the course will be the polka-dot flagging, which indicated a turn at an intersection. There will be at least two of these flags before a turn in the course, which will be placed before and on the same side as the required turn.
As you start to approach the intersections, please look for any polka-dot flags before turning. Waiting until you're in the intersection to determine the correct direction may be confusing and you may go the wrong way.
After you complete the turn, there will be orange and/or pink flagging indicating the correct route. We also hang blue ribbons at critical junctions indicating the wrong way. Blue is bad!
If you go 3-5 minutes without seeing your respective flagging, it's likely you've gone off course and should retrace your path until you find the course again.
Aid Stations
There will be fully-stocked aid stations every 3 - 5 miles. You can expect fresh fruit, salty snacks, assorted candy, water, and Clif Shot Electrolyte sports drink. It is highly recommended that runners carry at least 20 oz. of water between aid stations.
Coastal Trail Runs's logo
Coastal Trail Runs
Our events are located in amazingly beautiful parks and recreation areas in California. We are known for our well-marked courses, accurately measured distances, immediate race results, quality shirt designs, and low-key, friendly atmosphere. For courses that are designed to be easier, flatter, and faster, check out one of our Zoom or ZombieRunner events. We have organized over 400 events during the past 16 years. We love trail running and we promise you a rewarding experience.
View more Coastal Trail Runs eventsExternalLink
Do I need to bring my own cup to the Diablo Trail Run?
Yes, in an effort to protect the environment runners are asked to bring their own drinking bottles and cups that can be filled up at the aid stations.
How hilly is the Diablo Trail Run?
If you are doing the 4 mile run then course is fairly flat, but if you are tackling one of the longer trails then it can be quite a hilly course and you should make sure you've got some hill training in before taking it on.
Is there a time cut-off for the Diablo Trail Run?
Yes, there is a 9 hour limit for the Marathon and 50k races, so runners should make sure they are on track for completing this time.
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