WorkWindow

Outdoor Project Weather in Westminster, CO

This page runs Westminster's forecast against all six task rulesets at once. Verdicts load live above; the month-by-month matrix below — built from NOAA 1991–2020 normals — shows when each job's season opens. Lawn Seeding gets the most calendar here: 101 workable days a year.

Today at a glance

Verdicts load live from the 10-day forecast; without JavaScript this column stays blank and the year-round matrix below still answers the planning question.
TaskTodayBest months hereFull 10-day check
Deck Staining — Sep, Jun, Aug Stain a Deck in Westminster →
Exterior Painting — Sep, Jun, Aug Paint Outside in Westminster →
Driveway Sealing — Jun, Aug, Sep Seal a Driveway in Westminster →
Concrete Pouring — Sep, Jun, Aug Pour Concrete in Westminster →
Roof Coating — Sep, Jun, Aug Coat a Roof in Westminster →
Lawn Seeding — May, Sep, Oct Seed a Lawn in Westminster →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for NORTHGLENN, CO US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 0 0 0 0 19 23 0 20 24 6 0 0
Exterior Painting 0 0 0 0 19 23 0 20 24 6 0 0
Driveway Sealing 0 0 0 0 0 22 0 20 10 0 0 0
Concrete Pouring 0 0 0 0 19 23 0 20 24 6 0 0
Roof Coating 0 0 0 0 19 23 0 20 24 6 0 0
Lawn Seeding 0 0 0 14 31 13 0 0 23 20 0 0

Season edges differ by task — that's the point of checking six at once. In Westminster the earliest opener starts around April and the last holdout closes after September. A week that fails the paint rules on humidity can still pass seeding, and a frost that ends concrete season leaves sealing untouched until nights slip under 50°F.

If you only open one full check, make it lawn seeding — Westminster's longest season at 101 workable days.

Full 10-day checks

Colorado

Climatology: NOAA 1991–2020 normals via NORTHGLENN, CO US (4.5 km from Westminster center); live outlook by Open-Meteo.