San Diego Half Marathon & 5K

San Diego Half Marathon & 5K takes place in San Diego, California, on March 21, 2027. The 5K (3.1 miles) sets off first at 6:30 a.m., and the San Diego Half Marathon (13.1 miles) follows twenty minutes later at 6:50 a.m. Both are early starts by road-race standards, which means an early alarm but a finish that leaves most of the day free.

A March half in Southern California is a natural spring goal race, and the timing works well if you want a fast 13.1 before the year warms up. Give it a 12-week build: one long run each weekend stepping up toward 12 miles, one tempo session of three to five miles at goal pace, and easy running otherwise. With a 6:50 a.m. gun, eat something light at least ninety minutes beforehand and warm up in whatever you can shed at the line. The 5K suits anyone wanting the same morning over a shorter distance.