56 Upcoming Half Marathon Races Near Portola Valley, CA

Beer City Half™ Alameda

Alameda, CA

Saturday, July 11th, 2026

Half

10K

View details for race Beer City Half™ Alameda

San Lorenzo River Trail Run

Santa Cruz, CA

Saturday, July 11th, 2026

Half

Ultra

Marathon

Trail

View details for race San Lorenzo River Trail Run

Bad Bass

Castro Valley, CA

Saturday, July 18th, 2026

Half

View details for race Bad Bass

Bad Bass 2026

Castro Valley, CA

Saturday, July 18th, 2026

Half

10K

Trail

View details for race Bad Bass 2026

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Muir Woods Mt. Challenge

Stinson Beach, CA

Saturday, July 18th, 2026

Half

10K

Trail

View details for race Muir Woods Mt. Challenge

2026 San Francisco Marathon

San Francisco, CA

Sunday, July 26th, 2026

Marathon

Half

View details for race 2026 San Francisco Marathon

Summer Breeze 2026

San Leandro, CA

Saturday, August 1st, 2026

Half

10K

Trail

View details for race Summer Breeze 2026

Summer Breeze

San Leandro, CA

Saturday, August 1st, 2026

10K

Half

Trail

View details for race Summer Breeze

Golden Gate Bridge Half 13.1, 10k, 5k

San Francisco, CA

Saturday, August 8th, 2026

Half

Fast

View details for race Golden Gate Bridge Half 13.1, 10k, 5k

Bear Creek 2026

Lafayette, CA

Saturday, August 8th, 2026

Half

10K

Trail

Fast

View details for race Bear Creek 2026

Redwood (Summer) Trail Run

Oakland, CA

Saturday, August 15th, 2026

Half

Ultra

Marathon

Trail

View details for race Redwood (Summer) Trail Run

Beer City Half™ SLAM

Fremont, CA

Saturday, August 15th, 2026

Half

10K

View details for race Beer City Half™ SLAM

Santa Cruz Trail Run

Felton, CA

Saturday, August 22nd, 2026

Half

10K

Trail

View details for race Santa Cruz Trail Run

SPASM Crystal Springs Trail Run

Woodside, CA

Saturday, August 29th, 2026

10K

Half

Marathon

View details for race SPASM Crystal Springs Trail Run

2026 Angel Island Half Marathon & 10K

Tiburon, CA

Saturday, August 29th, 2026

Half

10K

Trail

View details for race 2026 Angel Island Half Marathon & 10K

Vibha Bay Area Dream Mile 2026

Sunnyvale, CA

Sunday, September 6th, 2026

Half

10K

View details for race Vibha Bay Area Dream Mile 2026

Diablo Trail Run

Clayton, CA

Sunday, September 6th, 2026

10 Miles

Half

Marathon

Trail

Fast

View details for race Diablo Trail Run

The Honey Badger Half (& 10K/5K)

Santa Venetia, CA

Friday, September 11th, 2026

10K

Half

Trail

View details for race The Honey Badger Half (& 10K/5K)

Beer City Half™ Bishop Ranch

San Ramon, CA

Saturday, September 12th, 2026

Half

10K

View details for race Beer City Half™ Bishop Ranch

Rocky Ridge 2026

San Ramon, CA

Saturday, September 19th, 2026

Half

10K

Trail

Fast

View details for race Rocky Ridge 2026

Alameda Island Running Festival

Alameda, CA

Sunday, September 20th, 2026

Half

10K

View details for race Alameda Island Running Festival

Lake Merced ½ Marathon and 4.5 Mile Run

San Francisco, CA

Sunday, September 27th, 2026

Half

View details for race Lake Merced ½ Marathon and 4.5 Mile Run

SGRAIL Marin - Triathlon & Trail Half Marathon

San Rafael, CA

Friday, October 2nd, 2026

Ultra

Half

1 Mile

Trail

View details for race SGRAIL Marin - Triathlon & Trail Half Marathon

Diablo Summit Stomp 2026

Walnut Creek, CA

Saturday, October 17th, 2026

Half

10K

Trail

View details for race Diablo Summit Stomp 2026

ZombieRunner Halloween

San Jose, CA

Saturday, October 31st, 2026

10K

Half

Trail

View details for race ZombieRunner Halloween

Lake Chabot Trail Run

Castro Valley, CA

Saturday, November 7th, 2026

Half

Ultra

Marathon

Trail

View details for race Lake Chabot Trail Run

RunThrough San Francisco at Crissy Field 5k, 10...

San Francisco, CA

Saturday, November 7th, 2026

10K

Half

Fast

View details for race RunThrough San Francisco at Crissy Field 5k, 100k & Half Marathon

ZombieRunner Quarry Lakes

Fremont, CA

Saturday, November 14th, 2026

10K

Half

Trail

Fast

View details for race ZombieRunner Quarry Lakes

Zoom Turkey Trot

San Jose, CA

Thursday, November 26th, 2026

10K

Half

Trail

View details for race Zoom Turkey Trot

Quarry Turkey 2026

Fremont, CA

Saturday, November 28th, 2026

Half

10K

Fast

View details for race Quarry Turkey 2026

Summit Rock 2026

Saratoga, CA

Saturday, December 12th, 2026

Half

10K

Trail

View details for race Summit Rock 2026

2026 Hark the Herald Half Marathon & 10K

Tiburon, CA

Saturday, December 12th, 2026

Half

10K

Trail

View details for race 2026 Hark the Herald Half Marathon & 10K

Brazen New Year's Eve 2026

Castro Valley, CA

Thursday, December 31st, 2026

Half

10K

Trail

View details for race Brazen New Year's Eve 2026

Brazen New Year's Day 2027

Castro Valley, CA

Friday, January 1st, 2027

Half

10K

Trail

View details for race Brazen New Year's Day 2027

Crystal Springs Trail Run

Woodside, CA

Sunday, January 17th, 2027

Half

Marathon

Ultra

Trail

View details for race Crystal Springs Trail Run

Run for Donut SAN FRANCISCO

San Francisco, CA

Saturday, January 30th, 2027

10K

Half

View details for race Run for Donut SAN FRANCISCO

Coyote Hills 2027

Fremont, CA

Saturday, January 30th, 2027

Half

10K

View details for race Coyote Hills 2027

Coyote Hills

Fremont, CA

Saturday, January 30th, 2027

Half

10K

View details for race Coyote Hills

Coffee Lover Run SAN FRANCISCO

San Francisco, CA

Saturday, January 30th, 2027

10K

Half

View details for race Coffee Lover Run SAN FRANCISCO

Golden Gate Trail Run

Sausalito, CA

Saturday, February 6th, 2027

Half

Ultra

Marathon

Trail

View details for race Golden Gate Trail Run

Run for Chocolate 5k/10k/13.1 SAN FRANCISCO

San Francisco, CA

Saturday, February 13th, 2027

10K

Half

View details for race Run for Chocolate 5k/10k/13.1 SAN FRANCISCO

Bay Breeze 2027

San Leandro, CA

Saturday, February 13th, 2027

Half

10K

Trail

View details for race Bay Breeze 2027

Victory 2027

Richmond, CA

Saturday, February 20th, 2027

Half

10K

Trail

Fast

View details for race Victory 2027

Montara Mountain Trail Run

Pacifica, CA

Saturday, February 20th, 2027

10K

Half

Marathon

View details for race Montara Mountain Trail Run

Zoom San Francisco

San Francisco, CA

Saturday, March 13th, 2027

10K

Half

Trail

View details for race Zoom San Francisco

Redwood (Spring) Trail Run

Oakland, CA

Saturday, March 20th, 2027

Half

Marathon

Ultra

Trail

View details for race Redwood (Spring) Trail Run

2027 Oakland Marathon

Oakland, CA

Saturday, March 20th, 2027

Half

Marathon

View details for race 2027 Oakland Marathon

Western Pacific 2027

Fremont, CA

Saturday, March 27th, 2027

Half

10K

Trail

View details for race Western Pacific 2027

Diablo Trails Challenge 2027

Walnut Creek, CA

Saturday, April 3rd, 2027

Half

10K

Trail

View details for race Diablo Trails Challenge 2027

Horseshoe Lake Trail Run

Los Gatos, CA

Saturday, April 17th, 2027

1 Mile

Half

Ultra

Trail

View details for race Horseshoe Lake Trail Run

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