YT are available all year, but it would be best to check the regs (link below) for your area for other
fisheries (assuming you're in California)...
http://www.dfg.ca.gov/marine/sportfishing_regs2007.asp
Be sure to get a fishing license and be sure to get a new one on Jan 1, 2008,
as the license is only valid for the calendar year.
Good luck and have fun!