When in April are most ultramarathons held?
The busiest weekend in California is April 17 and April 18, with 3 of them. One more falls on a weekday, which is worth knowing if you are traveling for it.
Race calendar · April 2027 · California
Ultramarathons in California in April 2027
Every Ultra in California in April 2027, all 6 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
April Ultramarathons, By the Numbers
19:54:34Median finish time
5:03:32Median winning time
20Median field size
4April ultramarathons 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 April
The April Race Weekends
Ultramarathons are not spread evenly across April. 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 April Ultra in California, from the most recent published results.
California Ultramarathons by City in April
All Ultra Marathons in California in April
6 total Sat, Apr 3, 2027Release the Kraken 5K. 10K. 18 Miler & 50K Long Beach, CAFrom $85Details Fri, Apr 16, 2027Run4Kids Ultra Running Party Corona, CAFrom $89Details Sat, Apr 17, 2027Mountains 2 Beach Marathon and Half Ventura, CAFrom $252Details Sat, Apr 17, 2027Silver Moon Race: Kings River Reedley, CAFrom $260Details Sat, Apr 17, 2027SPASM Lake Chabot Trail Run Castro Valley, CAFrom $90Details Sat, Apr 24, 2027Horseshoe Lake Trail Run Los Gatos, CAFrom $90Details
Common Questions About Running an April Ultra in California
What is a good Ultra time?
Across the 4 of these April ultramarathons with published results from past editions, the median finisher ran 19:54:34, and the median winning time was 5:03:32. So anything under 19:54:34 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 April Ultra field?
The median one finished 20 runners, across the 4 of these April ultramarathons 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 27:37:26.
Are there trail ultramarathons in California in April?
Yes, 2 races around California get you off the pavement: 2 are trail races.