You'll still need insurance on the vehicle while it is for sale as potential buyers will be "test driving" your vehicle.
When you've actually sold the car, notify us so we can take the car off your insurance.
Make sure to do a bill of sale and keep a copy (to prove dates, etc.).
Be sure to submit a Release of Liability form to your DMV. (People often delay re-registering a car until the registration "runs out," but in doing so you could be held liable for accidents, parking tickets, etc.)
California online submittal: www.dmv.ca.gov/online/nrl/welcome.htm