What is the time difference between Colorado and California?

Colorado is in the Mountain Time Zone (MT), while California is in the Pacific Time Zone (PT). During Standard Time, Colorado is one hour ahead of California: California time is UTC−08:00 and Colorado time is UTC−07:00.

However, during Daylight Saving Time (DST), which begins on the second Sunday in March and ends on the first Sunday in November, both states observe UTC−07:00, so there is no time difference between Colorado and California during this period.