WorkWindow

Outdoor Project Weather in Boulder, CO

This page runs Boulder'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: 124 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, Aug, Jul Stain a Deck in Boulder →
Exterior Painting — Sep, Aug, Jul Paint Outside in Boulder →
Driveway Sealing — Aug, Jul, Jun Seal a Driveway in Boulder →
Concrete Pouring — Sep, Aug, Jul Pour Concrete in Boulder →
Roof Coating — Sep, Aug, Jul Coat a Roof in Boulder →
Lawn Seeding — May, Sep, Jun Seed a Lawn in Boulder →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for BOULDER, CO US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 0 0 0 0 14 20 20 21 22 5 0 0
Exterior Painting 0 0 0 0 14 20 20 21 22 5 0 0
Driveway Sealing 0 0 0 0 0 13 20 21 7 0 0 0
Concrete Pouring 0 0 0 0 14 20 20 21 22 5 0 0
Roof Coating 0 0 0 0 14 20 20 21 22 5 0 0
Lawn Seeding 0 0 0 11 31 23 0 7 30 22 0 0

Season edges differ by task — that's the point of checking six at once. In Boulder 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 — Boulder's longest season at 124 workable days.

Full 10-day checks

Colorado

Climatology: NOAA 1991–2020 normals via BOULDER, CO US (3.8 km from Boulder center); live outlook by Open-Meteo.