|No. of teams||6|
|Vallejo Admirals (2017)|
|Most titles||San Rafael Pacifics (2)|
The league features a 80 game split-season that runs from June to August. First half winners face the second half winner in a one-game playoff (if needed) for the championship. On top of a salary, each player in the league is also provided housing accommodations and two meals a day six days a week.
During the initial season, two Hawaii-based teams, the Hawaii Stars and the Maui Warriors, played inter-league games against the Baseball Challenge League of Japan; California teams played against the Freedom Pro League of Arizona.
Both Hawaii teams, the Stars and the Warriors, ceased operations after playing the 2013 season due to the travel costs of bringing in opponents from Northern California. The East Bay Lumberjacks also did not return for a second season.
Two expansion clubs were added in 2014 (Sonoma Stompers and Pittsburg Mettle) bringing the total number of teams to four. A fifth member, Napa Silverados, was added as an expansion team beginning play in 2018.
In 2017 San Francisco businessman and entrepreneur Jonathan Stone was named league commissioner.
|Martinez Clippers||2018||Martinez, California||Joe DiMaggio Field at Waterfront Park||350|
|Napa Silverados||2018||Napa, California||NVC Storm Field|
|Pittsburg Diamonds||2014||Pittsburg, California||Winter Chevrolet Stadium|
|San Rafael Pacifics||2013||San Rafael, California||Albert Park||1,200|
|Sonoma Stompers||2014||Sonoma, California||Peoples Home Equity Ballpark at Arnold Field||1,400|
|Vallejo Admirals||2013||Vallejo, California||Wilson Park||500|
League members Former Team
|Season||1st Half Winner||2nd Half Winner||League Champion||Playoff Game Result|
|2013||Na Koa Ikaika Maui||San Rafael Pacifics||Na Koa Ikaika Maui||6-1|
|2014||San Rafael Pacifics||San Rafael Pacifics||San Rafael Pacifics||none|
|2015||Sonoma Stompers||San Rafael Pacifics||San Rafael Pacifics||4-3|
|2016||Sonoma Stompers||Sonoma Stompers||Sonoma Stompers||none|
|2017||Sonoma Stompers||Vallejo Admirals||Vallejo Admirals||11-8|
|Season||League MVP||Pitcher of the Year||Reliever of the Year||Rookie of the Year||Manager of the Year||Executive of the Year|
|2014||Jayce Ray, Sonoma||Patrick Conroy, San Rafael||Collin Allen, San Rafael||Jordan Hinshaw, Vallejo||Garry Templeton II, Vallejo||none|
|2015||Matt Chavez, San Rafael||Max Beatty, San Rafael||Sean Conroy, Sonoma||Mark Hurley, Sonoma||Aaron Miles, Pittsburg||Mike Shaprio, San Rafael|
|2016||Joel Carranza, Sonoma||Patrick Conroy, San Rafael||JR Bunda, San Rafael||Marquis Hutchinson, Vallejo||Takashi Miyoshi, Sonoma||Theo Fightmaster, Sonoma|
|2017||Tillman Pugh, Vallejo ||Tyler Garkow, Sonoma ||Sammy Gervacio, Vallejo ||Michael Rizzitello, San Rafael||PJ Phillips, Vallejo / Takashi Miyoshi, Sonoma ||none|