Schools run on a calendar with its own physics: budgets close in spring, teachers reset in August, energy craters in March. Initiatives launched against that rhythm fail no matter how good the idea. Leaders who move instruction understand the year as a sequence of windows.
The windows
Fall (September–November): pilot season. Teachers have energy and a full arc of the year ahead. Launch small — a champion cohort, not a mandate. The goal is proof, not scale.
Winter (December–February): evidence season. Collect what the pilot produced: student work, teacher testimony, participation. This is when next year's budget conversations quietly begin — arrive with artifacts, not adjectives.
Spring (March–May): decision season. Budgets are finalized, contracts signed, master schedules built. An initiative absent from spring decisions doesn't exist next year, however beloved.
Summer: capacity season. PD that asks teachers to build real units for their actual fall classes — not sit through slideshows — converts commitment into readiness.
Show me a school's calendar and budget, and I'll tell you its instructional priorities. Everything else is aspiration.
The compounding rule
One well-timed year beats three urgent ones. A fall cohort that becomes spring evidence that becomes summer training produces a second year that starts at scale — with faculty who watched colleagues succeed rather than being told to.
