Race calendar · September 2026 · California
Every 10K in California in September 2026, all 18 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
18 10K races in September 2026
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.
By the numbers
The September 10K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
The busiest weekend in California is September 26 and September 27, with 17 10K races on those two days, and the single busiest day is Saturday, September 26 with 12. Another 1 fall on a weekday, which is worth knowing if you are traveling for one.
As early as you can. 2 of these September 10K races already have a price increase on the calendar, and 11 are open for entry right now. Another 6 have published an opening date and have not opened yet.
The typical entry is $30, with paid entries running from $25 up to $80, 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 4 of these September 10K races with published results from past editions, the median finisher ran 1:08:37, and the median winning time was 44:51. So anything under 1:08:37 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 85 runners, across the 4 of these September 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 1:58:42.
August and October sit either side of September, which is where most people look next when a date does not fit.
