Yes, many insurance companies will only consider a US driving record and not your previous, Canadian, driving history. If you do not have a US driving history, since coming from a foreign country, your rates will be higher like a new driver.
Since you do not have a verifiable driving record in the U.S., your premiums will likely be higher until you establish a verifiable driving record. Once you drive in the U.S. for a few years and establish a safe record, your rates should go down.
To start comparison shopping for the best insurance rates available start here with us by getting a California car insurance quote.