Winter Prep Checklist for Longmont, CO
Here's the order to prep Longmont, CO for winter, set by local freeze data. Your first deadline is September 23 — prevent frozen pipes — and the sequence runs through the cold season into spring below.
Your winter prep order for Longmont
- SeptemberSeptember 23 — Prevent Frozen PipesSee details →
- OctoberOctober 2 — Winterize SprinklersSee details →
- OctoberOctober 2 — Winterize Your RVSee details →
- OctoberOctober 5 — Winterize Your BoatSee details →
- OctoberOctober 5 — Store Your MotorcycleSee details →
- OctoberOctober 12 — Test Your Car BatterySee details →
- MayMay 7 — Test Your Sump PumpSee details →
All nine Longmont deadlines, from NOAA Colorado freeze and snowfall normals, plotted across the season.
Dates are local deadlines derived from NOAA 1991–2020 freeze and snowfall normals for Longmont. Live outlooks on each linked page can move the urgency earlier.
How the order is set
Each task is pinned to Longmont'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. Helping family or friends nearby? Compare the full winter checklist for Littleton and Loveland.
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Winter prep in Longmont: related searches
This page answers the questions Longmont homeowners search every fall: when to winterize sprinklers in Longmont, when the first freeze usually hits Colorado, when to blow out irrigation lines, protect pipes, and get the snow blower serviced — all from the nearest NOAA station, not a national average.
Data: NOAA 1991–2020 normals via Longmont 2 Ese, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 25, 2026.