Race calendar · January 2027 · California

January 2027 10K Races in California

Every 10K in California in January 2027, all 48 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

48 10K races in January 2027

5K in JanuaryHalf Marathon in JanuaryMarathon in JanuaryUltra in January

What the field actually runs

January 10K Races, By the Numbers

1:04:45Median finish time
38:51Median winning time
90Median field size
18January 10K races 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 Sep 22, 2026.

When in January

The January Race Weekends

10K races do not spread evenly across January. The busiest weekend is January 16 and January 17, with 13 of them. Another 6 fall on a weekday.

  1. Jan 2 – Jan 36
  2. Jan 9 – Jan 105
  3. Jan 16 – Jan 1713
  4. Jan 23 – Jan 245
  5. Jan 30 – Jan 3113

By the numbers

The Biggest and Longest-Running

The January 10K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.

Largest field1,672 finishers2027 Altadena Forever Runin the 5KLongest-running8th year8th Annual KIWANIS RESOLUTION 5K Run/Walk, and 10K Run/Walkannual tradition

January 10K Races by City

Long Beach 9Los Angeles 5Sacramento 4San Diego 4San Francisco 3Castro Valley 2Altadena 1Auburn 1Bakersfield 1Canoga Park 1City of Industry 1Fremont 1Fresno 1Grass Valley 1Highland 1Huntington Beach 1Livermore 1Marina Del Rey 1
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Soonest 10K Races in January

48 total
Fri, Jan 1, 2027Run In The New Year 5k/10K/Half Marathon Huntington Beach, CA5K10KHalf MarathonFrom $38Details Fri, Jan 1, 2027Resolve2Run Grass Valley, CA5K10KRegistration opens Oct 1From $15Details Fri, Jan 1, 2027Auburn Resolution Run Auburn, CA5K10K10 MilesFrom $35Details Fri, Jan 1, 2027Brazen New Year's Day Castro Valley, CA5K10KHalf MarathonFrom $68Details Fri, Jan 1, 2027New Year's Day Dash - 5K, 10K, 10-Miler, Half Marathon Long Beach, CA5K10K15KHalf MarathonFrom $25Details Fri, Jan 1, 2027Brazen New Year's Eve Castro Valley, CA5K10KHalf MarathonFrom $68Details Sat, Jan 2, 20278th Annual KIWANIS RESOLUTION 5K Run/Walk, and 10K Run/Walk Mountain View, CA5K10K800mFrom $50Details Sat, Jan 2, 2027LASAA Mug Run - LASD Marina del Rey Station Marina Del Rey, CA5K10KFrom $30Details Sat, Jan 2, 2027Run Into 2027 Nipomo, CA5K10KFrom $50Details Sun, Jan 3, 2027The Running Chicken 2027 10K/5K Fun Run & Walk Santa Margarita, CA10K5KFrom $51Details Sun, Jan 3, 2027The Coffee Cruise - 5K, 10K, 10-Miler, Half Marathon Long Beach, CA5K10K10 MilesHalf MarathonFrom $25Details Sun, Jan 3, 2027Chasing Churros 5K, 10K & Half Marathon Long Beach, CA5K10KHalf MarathonFrom $49Details

Common Questions About Running a January 10K in California

When in January are most 10K races held?

The busiest weekend in California is January 16 and January 17, with 13 10K races on those two days, and the single busiest day is Saturday, January 16 with 13. Another 6 fall on a weekday, which is worth knowing if you are traveling for one.

When should I sign up for a January 10K?

As early as you can. 22 of these January 10K races already have a price increase on the calendar, and 45 are open for entry right now. Another 3 have published an opening date and have not opened yet.

How much does a January 10K cost to enter?

The typical entry is $30, with paid entries running from $15 up to $68, and 1 that are free to enter. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.

What is a good 10K time?

Across the 18 of these January 10K races with published results from past editions, the median finisher ran 1:04:45, and the median winning time was 38:51. So anything under 1:04:45 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 10K field?

The median one finished 90 runners, across the 18 of these January 10K races 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 1:55:46.

10K Races in Other Months

December and February sit either side of January, which is where most people look next when a date does not fit.

FebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember