Under the right conditions in Santa Barbara you can keep them out year round. The key is to acclimate them to the colder weather, i.e. put them out in the summer months and let them adjust to winter slowly as it gets colder. I live in SB and keep just about everything I have out year round and my stuff does really well. I do have an area though that is sheltered from the wind and gets a sold 5-7 yrs of sun a day depending on time of year. In the colder months of Nov, Dec and Jan depending on night time temps I put a blanket over my setup.
Basically, as it is really hot here right now keep them out during the day and bring them in when it is dark, around 8 o'clock. Once daylight savings hits you can start to keep them out longer but give them a chance to adjust before assuming everything will be ok to leave them out all the time. By June you should have no problems leaving them outside. Be sure to have a rain/wind sheltered spot for the cages and you should do good.
-Matt
