FrostList

Winter Prep Checklist for Flagstaff, AZ

Here's the order to prep Flagstaff, AZ for winter, set by local freeze data. Your first deadline is September 15 — prevent ice dams — and the sequence runs through the cold season into spring below.

Your winter prep order for Flagstaff

  1. SeptemberSeptember 15 — Prevent Ice DamsSee details →
  2. SeptemberSeptember 16 — Prevent Frozen PipesSee details →
  3. SeptemberSeptember 24 — Prep Your Snow BlowerSee details →
  4. SeptemberSeptember 28 — Store Your MotorcycleSee details →
  5. SeptemberSeptember 29 — Winterize SprinklersSee details →
  6. SeptemberSeptember 29 — Winterize Your RVSee details →
  7. OctoberOctober 2 — Winterize Your BoatSee details →
  8. OctoberOctober 9 — Test Your Car BatterySee details →
  9. JuneJune 4 — Test Your Sump PumpSee details →

Dates are local deadlines derived from NOAA 1991–2020 freeze and snowfall normals for Flagstaff. Live outlooks on each linked page can move the urgency earlier.

How the order is set

Each task is pinned to Flagstaff's own NOAA 1991–2020 freeze and snowfall normals, then ordered by its local deadline. Sprinklers, RVs, and boats key off the first 28°F freeze; pipes and motorcycles off the first freezing night; snow blowers and roofs off the first plowable snow. Follow any link for the live outlook and a checklist.

Data: NOAA 1991–2020 normals via Flagstaff Pulliam AP, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.