Some are weeks away, others are several months away. Different regions of the state and different schools within these regions finalize their schedules at different times. Factors to consider include: the size of the school's districts; whether they are in a district; attentiveness of administration responsible for such matters; the number of long time rivalries the schools has; whether the school seeks out of state or region games to bolster its reputation; other factors too numerous to mention.
Expect to see the first set of schedules out early to mid-February and finalized schedules for the great majority of schools by sometime in the spring (late spring for several).