Race calendar · January 2027 · California
Every Half Marathon in California in January 2027, all 35 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
35 Half Marathon races in January 2027
What the field actually runs
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
Half Marathon races do not spread evenly across January. The busiest weekend is January 16 and January 17, with 11 of them. Another 4 fall on a weekday.
By the numbers
The January Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
The busiest weekend in California is January 16 and January 17, with 11 Half Marathon races on those two days, and the single busiest day is Saturday, January 16 with 10. Another 4 fall on a weekday, which is worth knowing if you are traveling for one.
As early as you can. 13 of these January Half Marathon races already have a price increase on the calendar, and 33 are open for entry right now. Another 2 have published an opening date and have not opened yet.
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.
Across the 12 of these January Half Marathon races 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.
The median one finished 69 runners, across the 12 of these January Half Marathon 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 3:32:47.
Yes, 3 races around California get you off the pavement: 3 are trail races. Surfaces are not always published, so it is worth checking a specific race before you register.
December and February sit either side of January, which is where most people look next when a date does not fit.
