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Experience the Black Diamond Mines and Contra Loma Regional Parks!

All courses will have hills, the most challenging reserved for the half marathon runners! 5K and 10K will run around the lagoon on the Shore and Lake View trails. The 10K will go into Black Diamond Mines a short ways, while the half marathon will go deeper and get into some great single track in the heart of old mining operations there.

Course will be almost entirely on dirt trails.

As always, we welcome all levels of runners. Hikers/walkers, too.



7:30 AM


8:00 AM


8:15 AM


8:30 AM


For half marathon participants who wish to hike the course and take more than 3.5 hours, we will offer a "Hiker Division" start at 7:30 am. Those starting at 7:30 should carry water as the first and second aid stations might not be 100% up and running, depending on the hikers speed. Hiker starts will not be eligible to win the race or for age group awards, but will be listed as official finishers in the Hiker Division and will still receive finisher medals.


All courses include rolling hills, the most challenging saved for the half marathoners!

Because of the limitations of trails, the distances run slightly long for all races. Specifically:

5K: 3.27 miles

10K: 6.64 miles

Half Marathon: 13.49 miles


(Click on maps to view larger)



Half Marathon

Participants can pick up a copy of their appropriate course map on race day.

Each course will be marked with colored ribbons, signs and flour, so that runners know they are on the correct course. 


The half marathon has a 4.5 hour time limit to finish the course.

There are also the following cut-offs on the course:

Cut-Off for Aid Station #4 (mile 10)

Half runners must reach the 4th aid station (mile 9.88) by 11:20 am.


As with all of our races, water stations will be fully stocked with water, sports drink, gels, pretzels, candy, etc.

Water stations will be approximately 2-3 miles apart, as trail access allows.

Runners who may need more water (and all half marathon runners), should carry their own water bottle or hydration pack.

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.


Experience the Contra Loma and Black Diamond Mines Regional Parks!


Thank you to our race sponsors. Through their contributions, they help keep entry costs down and expose our runners to their outstanding products and services. Learn more about becoming a sponsor.

I often hear someone say 'I'm not a real runner.' We are all runners, some just run faster than others. I never met a fake runner.
Bart Yasso, Runner’s World Chief Running Officer
Brazen Racing

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