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Boys, age as of April 30th of the season

Pee Wee 4-6 years old

Valley 7-8 years old

Minor 9-11 years old

Girls, age as of December 31st of the season

Debs 4-6 years old

8U 7-8 years old

11U 9-11 years old



Due to the amount of rain, JOBL’s recreational fields have been made unplayable for the Spring season.  Our fields, which were in need of repair prior to the start of the season, have become too dangerous to allow for our young players to play baseball on this Spring.  JOBL Board is taking this opportunity to revitalize the complex with the following improvements:

1. We are purchasing a trailer style bathroom with separate  entrances for both male and female, each with running water.
2. We have begun to update the snack shack and bring it back to life with new equipment and an updated menu.
3. For the fields:
     a. We will be filling all outfield holes to ensure a smooth field for players to run to catch fly balls.
     b. We will be updating all infields to include:
           i. Infields raised with 70/30 infield mix
           ii. Sloped infields to guide rain water off the infield
           iii. Updated sprinkler system that will replace the field hoses
     c. We are repainting all fields.
     d. We are overhauling the bullpens for all fields to make the safe and easily useable.

In addition, we realize that in this economy things are very tight. So, our prices will be reducing next season. ALSO, everyone who signed up for this Spring season, is not only getting their full refund, but also a credit of $50 toward next Spring (2024) season.
The Board realizes that this is an inconvenience and apologize. We hope you return to the new and improved JOBL.


The Jr. Optimist Baseball/Softball League (“JOBL”) is a non-profit 501(c)(3) youth organization dedicated to the teaching of baseball and softball to the area youth. JOBL serves players primarily from Concord, Martinez, Clayton, Pittsburg, Clyde and Walnut Creek. JOBL was founded in 1963 and currently resides on property leased by Tesoro Martinez. JOBL is an all-volunteer league and its complex consists of fifteen (15) playing fields, two playground areas, a snack-shack and a conference room/equipment storage van area.

JOBL is a member of the Northern California section of the Cal-Ripken Division of the national Babe Ruth League organization. It serves girls and boys, ages 4 thru 14. League play as well as travel opportunities are available. For more information, please see our website at

In 1963, JOBL was founded by a group of baseball enthusiasts and played its early games on property that used to house the “Cowell Smokestack”. After a couple years, the league moved to a new location on land owned by the Martinez refinery – on land currently housing “Highway 4”!! When the State built Highway 4, eminent domain caused the league to relocate to its present location to make way for the new roadway. The Refinery has had several owners over the years, but is currently owned by “Tesoro Martinez”. Older boys divisions were later added, as well as girls divisions. The league started with eight ball fields and as it grew, more fields were added. The current number of fields is fifteen. As the league is an all-volunteer league, a small handful of volunteers maintains the complex and is responsible for any and all improvements or additions so any community involvement in these projects is extremely appreciated by all and quite often, makes certain projects a reality.

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