Skip to content


Only the toughest!

All half marathon runners are invited to participate in the Brazen Ultra Half Series.

The series consists of our toughest half marathons. Most measure at least a little (and sometime more than just a little) longer than 13.1 miles. What really makes them "ultra", however is the serious ascents and descents and variety of tough trails you have to run to finish them. While flat half marathons are always a challenge, these "ultra-half-marathons" take it to another level!

ultra series logo toughest


Join us on November 7, 2020 for our epic 5k, 10k, half marathon or 30K trail runs on Mount Diablo!


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.