Cal. Elec. Code § 9014

A petition for a proposed initiative measure or referendum shall not be circulated for signatures prior to the official summary date. A petition with signatures on a proposed initiative measure shall be filed with the county elections official not later than 150 days from the official summary date, and no county elections official shall accept a petition on the proposed initiative measure after that period. A petition for a proposed referendum measure shall be filed with the county elections officials not later than 90 days from the date the legislative bill was chaptered by the Secretary of State, and a county elections official shall not accept a petition for the proposed referendum after that period.