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Half Marathons found in California in October

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Half Marathons in California in October 2025

Find A Race is the US's favourite event listings site. Check out our list of October 2025 Half Marathons in California below.

Race Calendar: Half Marathons found in October

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Pinkathon 2025 Virtual and In-Person Challenge for Breast Cancer!

Any Place in the World!, California
01 May 25 - 31 Oct 25
Free - $27.50
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Diablo Summit Stomp 2025

Walnut Creek, California
18 Oct 25
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Pinkathon 2025 Virtual and In-Person Challenge for Breast Cancer!

Any Place in the World!, California
01 May 25 - 31 Oct 25
Free - $27.50

Long Beach, CA Galloway Training Program

Long Beach, California
07 Jun 25 - 04 Oct 25
$100.00 - $120.00

Half-Marathon Training for Fun & Fitness

Grass Valley, California
20 Jul 25 - 05 Oct 25
$36.55

Cheers to Oktoberfest Run 5K/10K/13.1 LOS ANGELES

Los Angeles, California
04 Oct 25
$32.80 - $48.70

Cheers to Oktoberfest Run 5K/10K/13.1 SAN FRANCISCO

San Francisco, California
04 Oct 25
$32.80 - $48.70

The Auburn Half Marathon 2025

Auburn, California
04 Oct 25

Hallo-Thanks-Mas Dash – 5K, 10K, and Half Marathon

San Diego, California
04 Oct 25
$31.21 - $46.05

Cheers to Oktoberfest Run 5K/10K/13.1 SACRAMENTO

Sacramento, California
04 Oct 25
$32.80 - $48.70

Run for Donuts 5K/10K/13.1 SACRAMENTO

Sacramento, California
04 Oct 25
$32.80 - $48.70

Run for Donuts 5K/10K/13.1 SAN FRANCISCO

San Francisco, California
04 Oct 25
$32.80 - $48.70

Run for Donuts 5K/10K/13.1 LOS ANGELES

Los Angeles, California
04 Oct 25
$32.80 - $48.70

Peace Officer Memorial Run

Modesto, California
05 Oct 25
Free - $128.20

Run by the Sea

Santa Cruz, California
05 Oct 25
$54.00 - $75.20

Redding Breakfast Lions Turtle Bay Run 2025

Redding, California
05 Oct 25
$22.20 - $64.60

Judgment Day Half Marathon & 5K Run/Walk

Bakersfield, California
05 Oct 25
$43.40 - $75.20

Napa Half Marathon

Napa, California
05 Oct 25
$75.20 - $91.10

LOOK GOOD FEEL GOOD SAN LEANDRO 5K, 10, HALF MARATHON & MARATHON

San Leandro, California
11 Oct 25
$34.00 - $133.50

Bizz Johnson

Susanville, California
11 Oct 25 - 12 Oct 25
$48.70 - $101.70

Night of the Living Runners – 5K, 10K, 10M, and Half Marathon

Long Beach, California
11 Oct 25
$26.97 - $41.81

Fast Times at Canoga High 5K, 10K & Half

Canoga Park, California
11 Oct 25
$34.99

Gobble Ghoul and Holly Run 5K, 10K, and Half Marathon

Long Beach, California
12 Oct 25
$31.73 - $42.33

Witches Wave - Halloween Run 5K, 10K, and Half Marathon

Huntington Beach, California
12 Oct 25
$42.33 - $52.93

2025 Humboldt Redwoods Marathon, Half Marathon, 5K

Weott, California
12 Oct 25
$54.25 - $128.45

Run Against Breast Cancer 5K/10K/13.1 SAN FRANCISCO

San Francisco, California
18 Oct 25
$32.80 - $48.70

International Sloth Day Run 5K/10K/13.1 SACRAMENTO

Sacramento, California
18 Oct 25
$32.80 - $48.70

International Sloth Day Run 5K/10K/13.1 SAN DIEGO

San Diego, California
18 Oct 25
$32.80 - $48.70

International Sloth Day Run 5K/10K/13.1 SAN FRANCISCO

San Francisco, California
18 Oct 25
$32.80 - $48.70

Diablo Summit Stomp 2025

Walnut Creek, California
18 Oct 25

International Sloth Day Run 5K/10K/13.1 LOS ANGELES

Santa Monica, California
18 Oct 25
$32.80 - $48.70

Back to the Future: 88 MPH Dash 5K, 10K & Half

Canoga Park, California
18 Oct 25
$34.99

Run Against Breast Cancer 5K/10K/13.1 LOS ANGELES

Santa Monica, California
18 Oct 25
$32.80 - $48.70

Run Against Breast Cancer 5K/10K/13.1 SACRAMENTO

Sacramento, California
18 Oct 25
$32.80 - $48.70

Run Against Breast Cancer 5K/10K/13.1 SAN DIEGO

San Diego, California
18 Oct 25
$32.80 - $48.70

Frightful Finish Line - Halloween Run 5K, 10K, & Half Marathon

Long Beach, California
19 Oct 25
$32.79 - $42.33

DIA DE LOS MUERTOS HALF MARATHON & 5K RUN/WALK (BAKERSFIELD)

Bakersfield, California
19 Oct 25
$28.56 - $79.44

Heart of Cool Trail Run

Cool, California
19 Oct 25
$32.80 - $59.30

The Ghostly Gallup – 5K, 10K, 10 Miler, and Half Marathon

Long Beach, California
19 Oct 25
$26.97 - $41.81

Fleet Feet Fall Classic - Trail October 19th, 2025

Chico, California
19 Oct 25
$85.80

MISSION INN RUN

Riverside, California
19 Oct 25
$22.95 - $87.00

Malibu Moves: Half Marathon, 10K, 5K, 1-Mi & 1K

Malibu, California
25 Oct 25 - 27 Oct 25
Free - $198.20
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