The new fire hazard severity zone maps issued by Cal Fire this week are part of a two-month statewide rollout.

Cal Fire's fire hazard severity maps are getting a makeover, and homeowners may want to pay attention. This critical city planning resource - which is getting a major update for the first time in more than 10 years - factors in scientific measurements to determine how fire-prone the cities and counties are in California.

Cal Fire added more than 360,000 acres in coastal Northern California to its fire hazard zones where heightened fire safety regulations will apply. New Southern California maps come out March 24.