San Mateo Adult Sports



New SM logo



SPRING 2022 Packet
Adult Sports Information
Rules & Forms 
Corporate Coed/3 Women Minimum Rules
Pitching Rule Addendum
Alternate Batter Rule Corporate Coed 
San Mateo & Belmont Rules of Play

Roster Form 






Equipment Information
Want to know if your bat is legal? 
Click below for all current USA equipment information.



USA Softball Page
& Bat Info


Unless specified in the City Rules above please refer to the USA Adult Slow-pitch Rulebook 




Please Read

Teams need the City of San Mateo's approval to Add/Drop any  players after 3rd game!!!


 Field Condition Hotline





Twitter Account



Follow @smfieldupdates



Interested In Our Leagues?
For more information about the Regional Softball League please email Deputy Commissioner,
Mary Villarin at mvillarin@cityofsanmateo.org
Free Agent Information
If you are a "Free Agent" and are looking for a team to join please email Deputy Commissioner Mary Villarin @ mvillarin@cityofsanmateo.org  In your email please include:   Information you are comfortable sharing about yourself (experience playing softball/baseball, positions played, nights available, etc.) Your preferred contact information (cell phone, email, etc.)  Please put FREE AGENT in the subject line  & be aware that your email will be copied and pasted to over 1200 managers.







Don't Be...


"That Guy/Girl" 


The San Mateo & Belmont Regional Adult Softball League is a Recreational League.  Recreational Leagues are meant to be "Recreational."



relating to or denoting activity done for enjoyment when one is not working.


Healthy competition is great but don't be the person that gets tossed from an adult slow pitch softball game. 


The pitches slowly come in underhand on an arc


The umpires are human


There are no scouts in the stands


The t-shirts given to the league champs are $8


We all have lives off the field      



Play hard, have fun, and be a good sport!!!




2021 Rule of Emphasis


Under NO Circumstances may a player from another team fill in on a different team in the same league.  There are no exceptions to this rule.  Any team caught utilizing a player on another team's roster within the same league will automatically be given a forfeit.  Any player caught playing for 2 different teams may also be subject to disciplinary action. 







Spring 22 Adult Softball Packet


Registration starts Monday, January 24th at 9am


The Registration Deadline is Friday, February 25th at 5pm

» Spring 2022 Softball