Mercer Island Little League: Welcome

Mercer Island Little League offers instructional and competitive baseball, softball, and tee-ball programs for youth ages 4-16 on Mercer Island, WA.  The league is part of Washington District 9 and Little League International.

Registration for MILL is open!

Check out the Baseball News and Softball News pages for specific information about those programs.


Player Pitch Baseball Families - We will host Show Your Stuff (SYS) on Sunday, January 28 at PEAK.  To register for a specific time slot use the links below.  Please make sure to select the age appropriate link.  If you are unsure of your child's league age please consult the chart below.

League Age 12 year olds

League Age 11 year olds

League Age 10 year olds

League Age 9 year olds


Softball Show Your Stuff will also be held on Sunday, January 28th in the afternoon and early evening.  Exact timing is being finalized and will published soon.

2018 Age Chart Baseball

Bats for the 2018 Season (Baseball only)

For the 2018 season, Little League is changing their bat standards.  The change will align Little League’s standards with those of USA Baseball, the governing body of amateur baseball in the United States.  Bats in the 2018 season will require a “USA Bat” stamp on them.  Any bat without the stamp will not be legal in Little League.  The change means that any bat used in the 2017 season will not be legal for the 2018 season (because it doesn’t have the stamp).  It also means that any bat purchased prior to fall 2017 (when bats with the stamp will go on sale) will also not be legal in the 2018 season.

Little League has a page on their website addressing the change.  You can see it here.

We recognize this is an inconvenience and an expense for many of you.  This is a mandate though and it will be enforced next season. Please let us know if you have any questions.

Field Closures?

(206) 436 - 1951,   @MIBGCAthletics or @MILittleLeague

  Updated as early as possible every day during the season.

Typically by 3pm on weekdays and 8:30am on weekends.



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