When in September are most 5K races held?
The busiest weekend in California is September 18 and September 19, with 5 of them, 4 of those on Saturday, September 18. One more falls on a weekday, which is worth knowing if you are traveling for it.
Race calendar · September 2027 · California
5K Races in California in September 2027
Every 5K in California in September 2027, all 11 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
September 5K Races, By the Numbers
35:00Median finish time
18:35Median winning time
223Median field size
5September 5K 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 Nov 12, 2026.
When in September
The September Race Weekends
5K races are not spread evenly across September. 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 and Longest-Running
The September 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
California 5K Races by City in September
All 5K Runs in California in September
11 total Sat, Sep 4, 20279/11 Run to Remember Clovis, CAFrom $38Details Mon, Sep 6, 2027Long Beach Labor Day Run - Labor of Love 5K, 10K, Kids Dash Long Beach, CAFrom $35Details Sat, Sep 11, 2027Beer City Half™ Bishop Ranch San Ramon, CAFrom $43Details Sun, Sep 12, 2027Aloha Run San Diego San Diego, CAFrom $36Details Sat, Sep 18, 2027We Run Oakland: For Our Children 2027 Oakland, CAFrom $20Details Sat, Sep 18, 2027Hunter's Heart Foundation - A World Beyond Wheels 5K Walk, Run, Ride South El Monte, CAFrom $35Details Sat, Sep 18, 2027Race to Cure Sarcoma San Diego San Diego, CAFrom $10Details Sat, Sep 18, 2027Chupacabra 5K. 10K. 18 Miler & 50K Long Beach, CAFrom $40Details Sun, Sep 19, 202711th Annual SJVRC ONE MILE FOR ONE CHILD San Jose, CARegistration opens Apr 9, 2027From $35Details Sun, Sep 26, 2027SoCal's Tiki Beach 5K & 10K Run/Walk Huntington Beach, CAFrom $36Details Sun, Sep 26, 2027Aloha Run Long Beach Long Beach, CAFrom $36Details
Common Questions About Running a September 5K in California
What is a good 5K time?
Across the 5 of these September 5K races with published results from past editions, the median finisher ran 35:00, and the median winning time was 18:35. So anything under 35:00 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 September 5K field?
The median one finished 223 runners, across the 5 of these September 5K 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 1:14:49.
Are there trail 5K races in California in September?
Yes, one race around California gets you off the pavement: 1 mixes road and trail.