Out of the small coastal enclave of Baywood-Los Osos, California, Toxic Wizard collapse genre walls with reckless abandon, fusing sludge heaviness, grindcore violence, power metal theatrics, and experimental noise into a deliberately unclassifiable whole since 2016.

Tripas Sangrientas is a goregrind band from West Covina, California, formed in 2023, dealing in the visceral, low-tuned carnage of gore-obsessed grindcore.

Twenty Twelve is a death metal and grindcore band from Ontario, California, formed in 2001, delivering compact bursts of extreme aggression within the death-grind tradition of the Southern California underground.

Uphill Battle formed in Santa Barbara, California in 1999 under the name Crawlspace before adopting their final name, playing a style that drew from grindcore's velocity and metalcore's structural tension. Their two Relapse Records albums — a self-titled debut (2002) and Wreck of Nerves (2004) — were noted for combining the dissonance of Discordance Axis with hardcore intensity recalling early Converge. The band split in 2005 and undertook a brief reunion in 2010.

Formed in San Luis Obispo, California in 2021, Urine Garden combine brutal death metal and goregrind in the tradition of the most deliberately repulsive corner of extreme music. Crude, fast, and precisely as disgusting as intended.

San Diego death metal and grindcore band formed in 2023, operating out of Southern California's second-largest city with a sound that fuses grindcore's hyper-compressed violence with the riff architecture of old-school death metal. A young act already tapping into the city's historically fertile underground extreme scene.