About
San Mateo National Little League offers Wiffle Ball, T-Ball, Single A, AA, AAA, Majors, and Juniors. It has divisions for ages 4 through 14, with Majors listed for ages 11-12, including advanced 10s, and Juniors listed for ages 13-14.
Programs
- Wiffle Ball — Age 4 · Youth baseball division for children age 4.
- T-Ball — Ages 5-6 · Youth baseball division for children ages 5-6.
- Single A — Ages 6-8 · Youth baseball division for children ages 6-8.
- AA — Ages 7-9 · Youth baseball division for children ages 7-9.
- AAA — Ages 9-11 · Youth baseball division for children ages 9-11.
- Majors — Ages 11-12 (advanced 10s) · Youth baseball division for children ages 11-12, including advanced 10s.
- Juniors — Ages 13-14 · Youth baseball division for children ages 13-14.
At a glance
- Ages: 4–14 years old
- General schedule: Runs both spring and fall seasons. Spring season is from February through June. Fall season is from August through November.
About the provider
San Mateo National Little League has served Bay Area families since 1955. It is a 100% volunteer-run nonprofit league serving families in San Mateo and across the Bay Area. Its mission is to instill teamwork, sportsmanship, and leadership in children through baseball, and to ensure every child has the chance to learn and play the game.
- Registration closes for Wiffle Ball, T-Ball, and age 6 — Registration closes 1/31/2027 for Wiffle Ball, T-Ball, and age 6 divisions
- Registration closes for ages 7–14 divisions — Registration closes 12/31/2026 for ages 7–14 divisions
Baseball age is the child’s actual age as of August 31 of the season’s calendar year. Registration is based on baseball age for Spring 2027 (age as of 8/31/2027). Players ages 4–7 can register regardless of where they live or go to school. For ages 8 and older, eligibility depends on living within SMNLL’s boundaries, attending a school within them, or having played with SMNLL continuously since age 7; waivers and exceptions are available. For children ages 8+ proof of residency or school enrollment is required.
Last updated October 28, 2026.
Is this your business? There is no cost, but you will be asked to sign up or log in.