Half Marathons in California in October
50 half marathons in California are on the calendar for October 2026–2027, in South Lake Tahoe, Canoga Park, Coloma, Walnut Creek and more. Tap a race for the course, weather, past results and how to register.
Lake Tahoe Marathon Weekend · South Lake Tahoe, California
Back to the Future: 88 MPH Dash 5K, 10K & Half · Canoga Park, California
California Gold Rush Trail Run · Coloma, California
Diablo Summit Stomp · Walnut Creek, California
Heart of Cool Trail Run · Cool, California
John Wayne Grit Series - Lone Pine · Lone Pine, California
Night of the Living Runners – 5K, 10K, 10-Miler, Half Marathon · Long Beach, California
Quicksilver Trail Challenge · San Jose, California
Run the Presidio over the Golden Gate Bridge Half 13.1, 10k, 5k · San Francisco, California
SPACEROCK Trail Race · Aqua Dulce, California
The Peak · Julian, California
2026 - City to the Sea Half Marathon & 5K · San Luis Obispo, California
Cloverdale Vineyard Races · Cloverdale, California
Fleet Feet Fall Classic - Trail October 18th, 2026 · Chico, California
Half Moon Bay Pumpkin Run · Half Moon Bay, California
Jeepers Creepers Marathon · Santa Clarita, California
Lake Tahoe Marathon Weekend · South Lake Tahoe, California
MISSION INN RUN · Riverside, California
Pasadena Trail Half Marathon · Pasadena, California
Pumpkin Run · Half Moon Bay, California
Witches Wave - Halloween Run 5K, 10K, and Half Marathon by Califlow Runs · Huntington Beach, California
After Dark Los Angeles 13.1 · Los Angeles, California
DIA DE LOS MUERTOS HALF MARATHON & 5K RUN/WALK (BAKERSFIELD) · Bakersfield, California
Headlands Half · Mill Valley, California
Malibu Moves: Half Marathon, 10K, 5K, 1-Mi & 1K · Malibu, California
Monster Dash 5k, 10k, 15k, Half Marathon · long beach, California
Napa Wine Country Marathon · Calistoga, California
Oakland Hills Trail Run · Oakland, California
RunThrough USA Long Beach 5k,10k & Half Marathon Race · Long Beach, California
Santa Cruz Island EcoExtreme 2026 · Ventura, California
Trail Run at Sly Park · Pollock Pines, California
2026 First Responders 1M 5K 10K 13.1 26.2 · Los Angeles, California
Crown Point Half and Marathon Relay · San Diego, California
Santa Cruz Marathon · Santa Cruz, California
Spooky Shuffle – 5k, 10k, Half Marathon · Van Nuys, California
Trick or Trot 5K, 10K, and Half Marathon by Califlow Runs · Long Beach, California
Halloween Trick or Trot Run 5K/10K/13.1 LOS ANGELES · Los Angeles, California
Halloween Trick or Trot Run 5K/10K/13.1 SACRAMENTO · Sacramento, California
Halloween Trick or Trot Run 5K/10K/13.1 SAN DIEGO · San Diego, California
Halloween Trick or Trot Run 5K/10K/13.1 SAN FRANCISCO · San Francisco, California
Happy Halloween 5k, 10k, 15k, Half Marathon · long beach, California
PB&J Fuel Run 5K/10K/13.1 LOS ANGELES · Los Angeles, California
PB&J Fuel Run 5K/10K/13.1 SACRAMENTO · Sacramento, California
PB&J Fuel Run 5K/10K/13.1 SAN DIEGO · San Diego, California
PB&J Fuel Run 5K/10K/13.1 SAN FRANCISCO · San Francisco, California
The Long Beach Halloween Run 5K. 10K. Half Marathon by Califlow Runs · Long Beach, California
ZombieRunner Halloween · San Jose, California
2027 Rock 'n' Roll San Jose · San Jose, California
2027 Pacific Beachfest Run · San Diego, California
2027 Peace Officer Memorial Run · Modesto, California