If you are in a situation where you've moved out of your home for a period of longer than 30 days, you may no longer be insured, even if your premium is up to date.  Most California homeowners' insurance policies don't extend coverage past 30 days.  Most policies have exclusions for "neglect" or "abandonment of property".  Each insurance company has their own guidelines in regard to vacant houses.  Even if coverage is extended, it may exclude coverage on vandalism and theft.

 Insurance companies view vacant houses as an "attractive nuisance".  Homes that are vacant are at higher risk for several things, such as vandalism and theft.   Kids could be attracted to the property just for the sake of fun, and get injured climbing over an aging fence or slip and fall after breaking in and staging an impromptu party.  Water damage from a leaking roof could go unnoticed and cause considerable damage.  These types of risks are why the fine print of your policy may exclude a vacant home from your California homeowner's insurance coverage.

 If you are in a situation where you will be leaving your home vacant, make sure that you call your insurance company and find out what's covered and what is specifically excluded.  The insurance company may write another policy specifically for vacant houses.  You may also have the option of buying an endorsement to your existing California homeowner's insurance policy.  The most important thing to remember is to not wait for a vacant home to be vandalized before checking your insurance policy.