Although the network was originally aimed at the Northern California region, the network began to expand as a complement to their Bay Area network, beginning with a rebranding to Comcast SportsNet California in September 2008, and becoming the official broadcaster of the Oakland Athletics (who were originally served by CSN Bay Area, in addition to the San Francisco Giants) for the 2009 MLB season, broadcasting an increased number of 145 regular season games (an increase of 37 from in 2008) The San Jose Sharks followed the Athletics from CSN Bay Area for the 2009-10 NHL season, seeing a similar increase in games broadcast with 75 games overall and 50 in high definition.
Bay Area basic cable packages have since added CSN California, which was previously available only to digital cable and satellite subscribers. CSN Bay Area and California merged websites and are officially considered "sister stations". The CSN Bay Area original program Chronicle Live also airs on CSN California at midnight.
With Comcast's acquisition of NBCUniversal in 2011, Comcast SportsNet was also integrated into the new NBC Sports Group, culminating with the addition of the peacock logo and an updated graphics package to mirror that of its parent network. Prior to 2014, Kings games on the network used a different graphics package, branded as "Kings TV", and were produced by the Kings and SacramentoABC affiliate KXTV (channel 10). For the 2014–15 season and beyond, Kings games will now feature the typical CSN graphics scheme used in other CSN networks.
A live simulcast of KRON-TV sports anchor Gary Radnich's KNBR radio show airs weekdays from 9 a.m. to noon on the network, unless preempted by a live sporting event on either CSN California or KNBR. Oakland Athletics pre-game and post-game shows are either hosted on-site for home games, or at CSN Bay Area's Sportsnet Central studios for road games. The station also shows Shark Byte, a magazine-style show centering on the San Jose Sharks that originated on CSN Bay Area.
CSN California was also home for the Oakland Raiders original show "Raiders Report", a weekly show featuring Raider news and game highlights. Beginning in the 2009 season, this was replaced by a live post-game show starting directly after network coverage of a Raiders game.
Comcast SportsNet California HD (CSN California HD) is a 1080ihigh-definition simulcast feed of CSN California. CSN California shows all Sacramento Kings home games in HD, as well as all San Jose Sharks home games as well as some road games. In 2010, CSN California began broadcasting all Athletics games in HD.
In September 2009, the contract with Dish Network expired, but the provider continued to carry the channel. Negotiations went on for months and the dispute went to the FCC for arbitration. Dish Network lost its case and dropped the channel on November 24, 2010. On February 3, 2011, Dish Network restored CSN California after the satellite provider reached an agreement to carry the channel without any legal arbitration.