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The following MGS Districts have opened registration for the 2021 Marin Girls Softball Season.  Visit your district site, and sign up now! (Click on the district link below)

Mill Valley (including Sausalito and Strawberry)
Tiburon (Including Strawberry)
* Strawberry residents may play for Mill Valley or Tiburon

Standing United with #Black Lives Matter

The game of softball doesn’t discriminate.  Our players, coaches, officials, and volunteers come from a diverse range of ethnicities and socioeconomic backgrounds.  

On the field, our players learn to respect one another based on their efforts as a player and a teammate.  It has been said multiple times that newborns don’t discriminate. It’s a learned behavior.   We as coaches, officials, and administrators of Marin Girls Softball know that we can have a positive influence on the actions, language, and behaviors of our players and our community, and we are committed to creating an environment where the values including inclusiveness, effort, and teamwork are demonstrated and encouraged every day, and discrimination in any form is not accepted.  

Marin Girls Softball stands united with the members of the Black community.  #BlackLivesMatter


2021 MGS Tremors Black Tryout Registration is Now OPEN!

MGS Tremors Black is a select program for Marin Girls Softball.  Players start practicing the second week of January, with great coaches, indoor facilities, clinics, and strength and conditioning training.

MGS Tremors Black fields 10U, 12U, and 14U teams.  We have successfully conducted our programs over the 2020 Summer and Fall, following carefully planned COVID-19 procedures, and as a result have provided a safe program for players, coaches, volunteers, and their families.

Every player wishing to be considered for the MGS Tremors Black program will need to sign up for registration.  This includes past players from MGS Tremors Black, Gold, or the Fall Ball Programs.

MGS Tremors Black tryouts will be held:

Date:               12/5/2020       

Location:         Bernard Hoffman Field, San Rafael

Format:           Depending on the number of athletes. (Safety being our  priority)

The final tryout format and times will be published the week before the tryout date.

To learn more, and signup for the registration, please click here.


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 USA Softball district program - providing an educational-athletic program for any age-eligible child can register and all registered kids play. 

This website is the central location for all League, Travel Ball, and District news.  At this site, players, parents, family and friends can get updated information about the MGSL, our Tremors Travel Ball teams, 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.

MGS email contact

(individual districts check your own page above)

Coach and Umpire Registration

Coach and umpire registrations are below.  Coaches- if you are planning to coach in any capacity for your district you MUST register here.  (coming for 2021 in January)


Send text to this number: 84483

Type in : MGSRainouts

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. 

MGS Recreation Season Age Division Overview

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