Doing a search on the PBS wiki for California and Crocus gives:
https://www.pacificbulbsociety.org/pbswiki/index.php/SpringBloomingCrocusFour
https://www.pacificbulbsociety.org/pbswiki/index.php/SpringBloomingCrocusThree
https://www.pacificbulbsociety.org/pbswiki/index.php/FallBloomingCrocusTwo
I gather California is a big state with a varying climate from North to South. But now you've said where, maybe some forum members from there will chip in.
https://www.pacificbulbsociety.org/pbswiki/index.php/SpringBloomingCrocusFour
https://www.pacificbulbsociety.org/pbswiki/index.php/SpringBloomingCrocusThree
https://www.pacificbulbsociety.org/pbswiki/index.php/FallBloomingCrocusTwo
I gather California is a big state with a varying climate from North to South. But now you've said where, maybe some forum members from there will chip in.