First Play Date - According to the CIF Master Calendar the first play date is Monday, February 22. There have been some errors with the CIF information, if you figure on a 1st scrimmage on the 24th and a 1st match on the 25th you should be okay.
REMINDER: CIF rules about practices and scrimmages. Each player must have participated in a minimum of five team practices before competing in a scrimmage or a match (Green Book - Article XI, L). Up to a maximum of two scrimmages may be scheduled before any matches are played. Once you have played a match, you may not have a scrimmage (Green Book - Article XI, R, 2).
First legal date for practice is Saturday, February 13 (Monday, February 15 is Washington's Birthday)