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Katelyn Harden joins Marin Tremors as 8U Head Coach

Dominican University's number one pitcher, and accomplished hitter and fielder, joins Marin Tremors coaching staff.  Read more...

Age Division Overview

Age is based on child's age on January 1 leading into Spring season.
Players 5 and 6 years old as of January 1st of the calendar year 
T-Ball and some coach pitch
Players 7 and 8 years old as of January 1st of the calendar year
Some girl pitch, some coach pitch
Players 9 and 10 years old as of January 1st of the calendar year
Girl fast pitch, some coach pitch
Players 11 and 12 years old as of January 1st of the calendar year
Girl fast pitch
Players 13 - 15 years old as of January 1st of the calendar year
Girl fast pitch

Playoffs (10u, 12u, 15u)

See below for all things playoff:

All regular season games are ending on May 16th and playoffs will begin just afterwards and can last up to 2 weeks (depending on the division).  

Playoffs are single elimination and can be played any day of the week at our various MGS fields. 

10U will be separated into a GOLD and SILVER bracket.  Gold will be those teams finishing .500 and above in the standings and Silver will be those teams below .500. 

All rules for playoffs are the same as regular season except  changes noted here (PLEASE READ):

Brackets are below.  Please note, schedules are subject to change due to field use, etc.  You should check back here when closer to playoff start to verify game is on the day/time you expect  MGS will update brackets after FINAL GAME SCORES are put in Sport Engine for all teams.  

UPDATE 5/15:  Games should be in your regular game schedule.  You may need to toggle to PLAYOFF season.  You click on your team or the bracket to see whole schedule.  Playoff scores can be updated the usual way.


Click Here for 10U Playoff Bracket

You will need to toggle for GOLD VS SILVER brackets after you click link above. Scores can be added the usual way. Find your team page, click Playoff Season, and see game schedule or bracket. If you can't find your team page, go to 10u Division from the Home menu. Then click Gold or SIlver to find the teams.

Click Here for 12u Playoff Bracket

Scores can be added the usual way (under your game schedule).

Click Here for 15u Playoff Bracket

Scores can be added the usual way (under your game schedule).

MGS Rainout text line

Send text to this number: 40404  

Type in : Follow mgsrainout

You will be a member for all MGS fields.  If a field is closed (even if it is not yours) it will be texted to you as a follower.  You need to read carefully to make sure it is your field as you are a member of the whole of MGS!  If you do not get text saying a field is closed-- assume it is open. We are only texting closures. 

Who Are We?

Marin Girls Softball League is a volunteer-driven recreational league for youth fast pitch softball in Central and Southern Marin County. We are a recreational program - any age-eligible child can register and all registered kids play. 

This website is the central location for all League and District news.  At this site, players, parents, family and friends can get updated information about the MGSL and about local Districts. Bookmark this site and come back often and regularly to stay current with all of the news related to players, teams, schedules, standings, clinics and other relevant information. We will update this page regularly to keep all MGSL participants and interested people up to date on our softball league.

Keep a copy of the rules in your team bag! (page #s below)

15u: pp 1-5 & 6-7

12u:  pp 1-5 & 8-10

10u: pp 1-5 & 11-15

8u: pp 1-5 & 16-18

6u: pp 1-5 & 19-21

Read the rules - Know the rules.

Fastpitch Softball Tryout informational flyers

The below area is for other Fastpitch competitive softball options, outside of MGS.  Please refer to each flyer for contact information regarding each league.


    Zorana Elizondo-Walker

    Zorana Elizondo-Walker

    Executive Director of Marin Girls Softball

    Phone: 415-846-5724

    Our Sponsors

    These fine organizations make what we do possible. Please show your support to these amazing sponsors and thank them for their commitment to our organization. Interested in becoming a sponsor? Click here to learn more about our sponsorship opportunities