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Who is MGS Tremors?

MGS Tremors is the competitive travel ball and summer club program for Marin Girls Softball.  Marin Tremors is open to all registered Marin Girls Softball players and field teams from 8U to 14U. 

MGS Tremors hosts teams with players that range from the elite, to the developing player.   We are incredibly proud of this focus, ensuring that every player that wants to continue developing their competitive softball, has the opportunity to do so.

Our programs start in January (Tremors Black), May (Tremors Gold and Club), and September (Tremors Fall Ball). 

Click here to visit our About Us page.


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Coaches! We're Hiring!


Hey, Coaches!  MGS Tremors is hiring for the 2022 season.  We still have a number of head and assistant coaching positions available.  If you are interested in coaching please complete the application form here.

Need Tremors Swag? Visit the store!

Tremors gear is available at our new online squad locker store.   Enter the code TREMORS15AS to get a 15% discount on all purchases.   To visit the store, please click here.

Need something urgently?   Visit T&B Sports on the corner of 4th and D Streets in San Rafael.  They have a range of gear they can rapidly add a Tremors logo.



SUNDAY, AUGUST 21st, 2022


MGS Tremors is holding tryouts for the 2022 Fall Ball season on Sunday, August 21st.

The Fall Ball season runs through September and October.  It's typically a lighter, less intense season than the summer championship season.  Younger players will be playing up at the next age level.

IMPORTANT:  If your player has had a great softball experience so far this year, please consider whether playing again in the fall has the potential to burn them out on the sport.  Our objective is to get all of our players to play high-school softball.  It is not to burn them before they get there!  If they're feeling like they need a break from softball, fall is a great time to do it.

Teams will practice two to three times per week over the fall, and the expectation is that a player joining a team will attend at least one practice per week (if they are practicing other sports), and the tournaments.

Each team will participate in 3+ tournaments during the season (2 for 8U), along with some friendly games against local teams.  Many of the tournaments over the fall are themed.  Play for the Cure, Spooky Halloween, etc.  It's a lot of fun.

Approximately 12 players (and possible practice players) will be selected for each team.  

Typically we look for a maximum of three pitchers and three catchers per team.  This ensures those players will get plenty of pitching and catching time to help them develop.

Coaches will be selecting players for their teams from the tryouts.  

Player Notification

All players that have been selected for the Fall Ball Tremors teams will be notified within 48hrs of the tryouts.

Click here to complete the registration.


MGS Tremors has played a very special role in the path these players have taken to college.  For all of these players, their first experience of travel ball softball was with MGS Tremors.  We are incredibly proud of the journey they have all taken.


Georgia Pineda - Emory University
Sammy Horn - Boston College

Sadie Leonard - Williams
Rose Malen - Chapman University 

Mia Kessinger - Haverford College
Vivian Johnson - St. Lawrence University

Rebecca Fong - University of Hawaii
Kassidy Stetler - California State University Monterey Bay
Elodie Townsend - Smith College
Kim Scarsella - Cornell University
Aria Pogni - Loyola Marymount University
Anne-Marie Iker - Amherst College
Shawn McCullough - Feather River College
Sami Mericle – Oberlin College

There are many more, and we're working on building an appropriate tribute to all our MGS Tremors alumni.  Please forward any additional names and the college they are or did attend.



MGS Tremors Black is the most competitive team program for MGS Tremors.  Teams compete in Open, A and B tournaments around the Bay Area and state.   Tryouts for the MGS Tremors Black teams were held December, 2020, with practices starting in January.

To learn more about our Tremors Black program, click here.

To compare all of our programs, click here.


MGS Tremors Gold

MGS Tremors Gold is our Summer Travel Ball program.  Kicking off right after the completion on the MGS recreation season, the MGS Tremors Gold program is the core of MGS Tremors.  

To learn more about our  Tremors Gold program, click here.

To compare all of our programs, click here.

MGS Tremors Club

MGS Tremors Club program is for players who are developing their game, or are not quite ready for the commitment of Travel Ball.  Our Club program is one of the most popular programs we conduct each year. 

To learn more about the Marin Tremors program, click here.

To compare all of our programs, click here.

8U at State Championships Opening Ceremonies San Diego July 12, 2019

16U Black takes 1st Place NorCal All-Star Tournament July 18, 2021

Tremors 14U Black Watsonville Gold Bracket Champions July 25, 2021

14U Black 1st Place Gold Bracket Champions Watsonville July 25, 2021

Tremors 12U Black play under lights, finishing 3rd in the Double Double AST Tournament on April 6/7

8U takes 1st Place Petaluma Father's Day June 16, 2019

12U Black won Silver 1st Place CSA Incline Village, NV July 11, 2021

10U Gold takes Silver 2nd Place CSA Napa/Vacaville June 9, 2019

12U '05 Team wins 2018 Rohnert Park Rebel Classic July 22, 2018!

12U '06 Team takes Silver 2nd Place in Napa June 10, 2018

12U Black takes 2nd Place Wine Country Classic Windsor June 9, 2019

10U B Team takes 2nd Place Windsor July 1 2018

16U Black took Silver 2nd Place San Ramon June 27, 2021

8U Team wins 1st Place Wine Country Classic Windsor June 9, 2019

12U Gold takes Silver 2nd Place CSA Napa/Vacaville June 9, 2019

10U C Team takes 2nd Place San Jose July 8 2018

12U Gold takes Silver 1st Place San Jose Bagby Classic June 16, 2019

12U Gold takes Silver 1st Place San Jose Bagby Classic June 16, 2019

14U Black takes 1st Place Benecia Firecracker Invitational July 7, 2019

10U Gold takes Silver 2nd Rohnert Park Rebel Classic July 18, 2021

10U Black takes 2nd Place CSA Incline Village, NV June 16, 2019

10U Black takes 2nd Place Wine Country Classic Windsor June 9, 2019

Fall 10U take Napa tournament Sept 16 2018

10U Team takes Silver 1st Place in Napa Sept 16, 2018

8U Team takes 2nd Place Windsor July 1 2018

10U Black takes Gold 2nd Place AST Queen of the Hill Martinez April 14, 2019