Most state seasons run late August through November.
Margin model. Scores cluster near 23 points a side with no draws, so the forecast uses a bell-curve margin rather than the goal-based approach behind the soccer engine.
No free national feed exists. MaxPreps and Hudl are closed, and Hudl only exposes an API to paying analytics customers for teams they already hold rights to.
Viable two ways: license a commercial data provider, or scope it to specific schools or a conference where results can be entered directly.