When in January are most half marathons held?
The busiest weekend in California is January 16 and January 17, with 11 of them, 10 of those on Saturday, January 16. Another 5 fall on a weekday, which is worth knowing if you are traveling for one.
Race calendar · January 2027 · California
Half Marathons in California in January 2027
Every Half Marathon in California in January 2027, all 37 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
January Half Marathons, By the Numbers
2:13:48Median finish time
1:31:58Median winning time
69Median field size
12January half marathons with published results
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Nov 12, 2026.
When in January
The January Race Weekends
Half marathons are not spread evenly across January. Here is how the calendar actually falls, weekend by weekend, which is the part worth knowing before you book a trip or plan a taper around one.
By the numbers
The Biggest Field
The largest field of any January Half Marathon in California, from the most recent published results.
California Half Marathons by City in January
All Half Marathons in California in January
37 total Fri, Jan 1, 2027Run In The New Year 5k/10K/Half Marathon Huntington Beach, CAFrom $78Details Fri, Jan 1, 2027Brazen New Year's Day Castro Valley, CAFrom $100Details Fri, Jan 1, 2027New Year's Day Dash - 5K, 10K, 10-Miler, Half Marathon Long Beach, CAFrom $39Details Fri, Jan 1, 2027Brazen New Year's Eve Castro Valley, CAFrom $100Details Sun, Jan 3, 2027Griffith Park Resolution Run Los Angeles, CAFrom $89Details Sun, Jan 3, 2027The Coffee Cruise - 5K, 10K, 10-Miler, Half Marathon Long Beach, CAFrom $39Details Sat, Jan 9, 2027Dia De Los Reyes Magos Half Marathon & 5k - Fresno Fresno, CAFrom $64Details Sat, Jan 9, 2027Citrus Heritage Run Riverside, CAFrom $99Details Sat, Jan 9, 2027San Diego 50 & Trail Runs Escondido, CAFrom $100Details Sat, Jan 9, 2027Grievances & Gratitude Run - New Year Reset 5K 10K Half Marathon Long Beach, CAFrom $59Details Sun, Jan 10, 2027The Cookie Classic - 5K, 10K, 10-Miler, Half Marathon Long Beach, CAFrom $39Details Sun, Jan 10, 2027Dia De Los Reyes Magos Half Marathon & 5k - Bakersfield Bakersfield, CAFrom $64Details Sat, Jan 16, 2027The Bagel Run - 5K, 10K, 10-Miler, Half Marathon Long Beach, CAFrom $39Details Sat, Jan 16, 2027Define Your Glow - New Year Reset 5K, 10K, Half Marathon Long Beach, CAFrom $65Details Sat, Jan 16, 2027MLK Jr. Freedom Run 5K/10K/13.1 LOS ANGELES Los Angeles, CAFrom $45Register Sat, Jan 16, 2027MLK Jr. Freedom Run 5K/10K/13.1 SACRAMENTO Sacramento, CAFrom $45Register Sat, Jan 16, 2027MLK Jr. Freedom Run 5K/10K/13.1 SAN DIEGO San Diego, CAFrom $45Register Sat, Jan 16, 2027MLK Jr. Freedom Run 5K/10K/13.1 SAN FRANCISCO San Francisco, CAFrom $45Register Sat, Jan 16, 2027Sunrise Marathon 5K/10K/13.1 LOS ANGELES Los Angeles, CAFrom $45Register Sat, Jan 16, 2027Sunrise Marathon 5K/10K/13.1 SACRAMENTO Sacramento, CAFrom $45Register Sat, Jan 16, 2027Sunrise Marathon 5K/10K/13.1 SAN DIEGO San Diego, CAFrom $45Register Sat, Jan 16, 2027Sunrise Marathon 5K/10K/13.1 SAN FRANCISCO Los Angeles, CAFrom $45Register Sun, Jan 17, 2027SPASM Crystal Springs Trail Run Woodside, CAFrom $70Details Fri, Jan 22, 2027Resolution Run for Coffee 5K/10K/13.1 - Roseville Rocklin, CAFrom $45Details Sat, Jan 23, 2027Polar Bear Run 5K, 10K, and Half Marathon Long Beach, CAFrom $53Details Sat, Jan 23, 2027Beyond The Streets 5k, 10k & Half Marathon Canoga Park, CARegistration opens Jan 16, 2027FreeDetails Sat, Jan 30, 2027Coyote Hills Fremont, CAFrom $70Details Sat, Jan 30, 2027Rotary Mission Ten - Half Marathon, 10 Mile and 5K San Juan Bautista, CAFrom $70Details Sat, Jan 30, 2027Coffee Lovers Run LOS ANGELES Los Angeles, CAFrom $45Register Sat, Jan 30, 2027Coffee Lovers Run SACRAMENTO Sacramento, CAFrom $45Register Sat, Jan 30, 2027Coffee Lovers Run SAN DIEGO San Diego, CAFrom $45Register Sat, Jan 30, 2027Coffee Lovers Run SAN FRANCISCO San Francisco, CAFrom $45Register Sat, Jan 30, 2027Run for Donuts LOS ANGELES Los Angeles, CAFrom $45Register Sat, Jan 30, 2027Run for Donuts SACRAMENTO Sacramento, CAFrom $45Register Sat, Jan 30, 2027Run for Donuts SAN DIEGO San Diego, CAFrom $45Register Sat, Jan 30, 2027Run for Donuts SAN FRANCISCO San Francisco, CAFrom $45Register Sun, Jan 31, 2027Besties Run 5K. 10K. Half Marathon , & Kids Dash Long Beach, CAFrom $65Details
Common Questions About Running a January Half Marathon in California
What is a good Half Marathon time?
Across the 12 of these January half marathons with published results from past editions, the median finisher ran 2:13:48, and the median winning time was 1:31:58. So anything under 2:13:48 puts you in the faster half of a typical field. That is the middle of these RunSignup fields, walkers and charity entrants included, not a national average.
How big is a typical January Half Marathon field?
The median one finished 69 runners, across the 12 of these January half marathons with published results from past editions. Most are far smaller than the big-city events people picture, which means less crowding at the start and a friendlier field, with a last recorded finisher at 3:32:47.
Are there trail half marathons in California in January?
Yes, 3 races around California get you off the pavement: 3 are trail races.