Rise to the challenge!
The longer you go, the more you see and experience! Courses are all on dirt trails, heading out from Castle Rock park in Walnut Creek, heading into Mount Diablo State Park -- all the way to the summit for the 30K.
The 5K, 10K, half marathon, and 30K courses are on dirt trails in Castle Rock and Mount Diablo State Park.
COURSE MAPS + ELEVATION
(Click on maps to view larger)
Each course will be marked with colored ribbons, signs, and flour. Runners unfamiliar with the courses should carry a copy of the course map to ensure they stay on course.
Want to follow the course with your phone or smart watch and know how to work with GPX files? You can do that by downloading the race course GPX file and then uploading it into your favorite app.
COURSE TIME LIMITS
The 30K will start at 8:15 am and the course will have a time limit of 6.5 hours.
30K runners must reach the following aid stations by the times listed:
Aid Station #3 (helipad aid, first visit at approximately mile 9): 11:15
Aid Station #4 (summit aid, approximately mile 12): 12:45
Aid Station #5 (helipad aid, second visit at approximately mile 15): 1:45
30KERS: MAKE A DEAL WITH EL DIABLO
If you are in the 30K and you reach Aid Station #3 (mile 9) any time before 12:30, you will be allowed to "make a deal with El Diablo" and switch to the half marathon mid-race. Those who take the deal will be counted as official finishers of the half marathon, but will not be eligible for any overall or age group awards. Instead of being listed with an age group division, their results will be listed in the "surrender" category.
HALF MARATHON CUT-OFFS
Half marathon runners must reach Aid Station #3 (helipad aid, approximately mile 9) by 12:30. If any half marathon participant arrives at this aid station after 12:30, they will be asked to accept a ride back to the start area.
Water stations will be stocked with water, sports drink, gels, pretzels, candy, etc.
We recommend all 10K, half marathon and 30K runners carry at least 2 bottles or a large hydration pack (or both).
Note: To lower the amount of waste at our Ultra Half Series races, we ask that our half marathon runners (and all runners where possible) be "cupless" during their runs, especially at the half-marathon-only water stations.
Since the course and conditions of these half marathon courses already dictate that carrying water bottles/hydration packs is the best practice, this is usually easy to do. Water station volunteers will be ready to refill whatever container one brings. Runners can also carry reusable cups that easily collapse and can be stuffed into their pockets/attached. If you wish to purchase a Hydrapak Speed Cup (available for $5 with sales tax), we have those available at our merchandise tent.
Half marathon water stations will not have full cups waiting for runners, but safety is their priority and so if you have nothing and need the fluids, they will get a cup for you.
Thank you to our race sponsors, through their contributions, our sponsors help keep entry costs down and expose our runners their outstanding products and services. Learn more about becoming a sponsor.