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City guide · Colorado

Outdoor Project Weather in Longmont, CO

One forecast, six label checks. Today's verdict for every task in Longmont loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Longmont 2 Ese, Co Us. The friendliest calendar here belongs to lawn seeding (90 workable days a year).

Six tasks · one forecast · Colorado

SeptemberBest overall month
Lawn SeedingFriendliest task
464 task-daysWorkable task-days/yr
6Tasks tracked
Average of all six tasks

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.
Task	Today	Best months here	Full 10-day check
Deck Staining	—	Aug, Sep, Jun	Stain a Deck in Longmont →
Exterior Painting	—	Aug, Sep, Jun	Paint Outside in Longmont →
Driveway Sealing	—	Aug, Jun, Sep	Seal a Driveway in Longmont →
Concrete Pouring	—	Aug, Sep, Jun	Pour Concrete in Longmont →
Roof Coating	—	Aug, Sep, Jun	Coat a Roof in Longmont →
Lawn Seeding	—	May, Sep, Jun	Seed a Lawn in Longmont →

City-to-city context helps: browse outdoor project weather in Lakewood, CO one stop back, or continue to Pueblo, CO’s project calendar.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for LONGMONT 2 ESE, CO US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	0	14	22	3	22	22	0	0	0
Exterior Painting	0	0	0	0	14	22	3	22	22	0	0	0
Driveway Sealing	0	0	0	0	0	13	3	22	4	0	0	0
Concrete Pouring	0	0	0	0	14	22	3	22	22	0	0	0
Roof Coating	0	0	0	0	14	22	3	22	22	0	0	0
Lawn Seeding	0	0	0	3	31	18	0	0	29	9	0	0

Which task gets the most weather in Longmont?

Lawn Seeding90days/yr
Deck Staining83days/yr
Exterior Painting83days/yr
Concrete Pouring83days/yr
Roof Coating83days/yr
Driveway Sealing42days/yr

The composite season in Longmont opens around May and closes after June: coatings wait on warm nights, concrete on freeze-free 48-hour stretches, seeding on the 55–80°F germination band. Between those bookends, the right question is which task fits this week — which is what the verdicts above answer.

Deepest calendar first: start with lawn seeding in Longmont (90 workable days a year), then work down the matrix.

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Full 10-day checks

Colorado

Climatology: NOAA 1991–2020 normals via LONGMONT 2 ESE, CO US (2.0 km from Longmont center); live outlook by Open-Meteo.