SD chapter is in SoCal, and it is one of the more competitive ones. It was formerly dominated by Carmel Valley Middle School until 2017-2018.

At the state competition, the CVMS team placed 1st in 2014, which is one of the only times a SoCal team has done so. In 2014, SD chapter students placed 2nd, 3rd, (incomplete). In 2015, san diego students placed 1st, 3rd, 4th, 6th, 11th, 12th, 16th, 20th, 21st, and 23rd. In 2016: 1st, 2nd, 6th, 9th, 10th, 16th, 19th, 21st, 23rd, and 25th.

In 2018, CVMS placed 11th, Muirlands placed 10th, Pacific Trails placed 5th, and Mesa Verde placed 3rd.

San Diego would have sent 1 person to nats last year and 2 this year, but they opted out.