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The Rock The Loch Half Marathon

Name: The Rock The Loch Half Marathon
Start: 2025-06-27
End: 2025-06-30
Location: Castro Valley

Castro Valley, United States • 27-30 Jun 2025

The Rock the Loch Half Marathon is a scenic trail running event held at Lake Chabot Regional Park in Castro Valley, California. Scheduled for late June 2025, it offers live and virtual participation options across three distances: 5K, 10K, and half marathon. The 5K is fully paved, ideal for beginners or fast runners, while the 10K combines paved and trail sections with a challenging climb. The half marathon features mostly trail terrain with nearly 1,700 feet of elevation change, suited for experienced trail runners. Participants enjoy aid stations with hydration and snacks, race swag including a custom shirt, handcrafted woodallion, and a beer sampler stein, plus post-race refreshments and a brewfest with music by DJ Cryptid. Visit the organization's website for the most recent information.

United States California Castro Valley

Race information

Registration

13 mi

Half Marathon (live)

10 km

10k (live)

5 km

5k (live)

10k (virtual)

5k (virtual)

Half Marathon (virtual)

Visit the organization's website for the most recent information.

Trail runs nearby

Saturday Dec 20

Woodside Ramble

Experience scenic single track trails under redwood canopy and along ridgelines at the Woodside Ramble. Distances from 10K to 50K offer a challenging, festive trail day; the event is sold out.

Saturday Dec 27

Brazen New Year's Eve

Ring out the year with Almost New Year's Eve at scenic Lake Chabot in Castro Valley on 12/27/25. Trail routes for runners, walkers and hikers include 5K, 10K and half marathon distances with free post race photos.

Thursday Jan 1

Brazen New Year's Day

Celebrate New Year’s Day with scenic loop races at Lake Chabot, from half marathon to 10K, 5K and remote options on rolling trail terrain. Enjoy free race photos and earn a New Year Mega Medal if you also ran Brazen New Year’s Eve.

Saturday Jan 3

Hacienda Hills Trail Run - Winter

...

Run scenic trails through Hacienda Hills at Almaden Quicksilver Park with distances for every level, from kids runs to ultramarathons. Take in Bay Area views, use on course aid and day of race registration, and earn a commemorative finisher..