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Deck Staining Weather in Colorado: Best Months by City

Deck Staining season in Colorado, city by city: peak months, season boundaries, and annual workable-day counts from NOAA 1991–2020 normals. Lakewood leads with 110 workable days a year; Longmont runs the shortest at 83.

Colorado is not one climate: Lakewood banks 110 workable deck staining days a year while Longmont gets 83 — a spread the table below itemizes month by month. Season boundaries mark the first and last month averaging 8+ workable days against the label rules (50–90°F, nights 40°F+).

Statewide, September is the strongest month — it tops or ties the table in most listed cities. The live strips on each city page decide the week; this table decides the month. Scoring rules: methodology; the national playbook: the deck staining guide.

Cities in Colorado

Peak months and season boundaries from NOAA 1991–2020 normals; season = months with at least 8 workable days.
CityPeak monthsSeasonWorkable days/yr
Denver Sep, Aug, Jun May–June 94
Colorado Springs Sep, Jun, Aug May–September 104
Aurora Sep, Aug, Jun May–June 94
Fort Collins Sep, Aug, Jul May–September 108
Lakewood Sep, Jul, Aug May–September 110
Thornton Sep, Jun, Aug May–June 92
Grand Junction May, Sep, Jun August–October 88
Greeley Sep, Jun, May May–June 86
Arvada Aug, Jul, Sep May–September 103
Pueblo Sep, May, Jun May–June 85
Boulder Sep, Aug, Jul May–September 103
Westminster Sep, Jun, Aug May–June 92
Centennial Sep, Jun, Aug May–September 108
Longmont Aug, Sep, Jun May–June 83
Highlands Ranch Sep, Jun, Aug May–September 108
Lafayette Sep, Jun, Aug May–June 92
Castle Rock Sep, Jul, Jun May–September 106

The rules behind these numbers

Typical label thresholds for deck staining — the single ruleset used by every check on this page.
CheckThresholdWhy it matters
Air temperature 50–90°F Air temperature while applying and for the first hours of dry time.
Overnight low ≥40°F during the first 24 h Overnight low during the cure window.
Dry before ≤0.05" rain in the prior 24 h; watch back to 48 h Wood must dry out after rain before it can absorb stain.
Dry after <0.05" rain for 24 h after (48 h oil-based formulas want 48 h dry) Water-based stains need roughly 24 dry hours; oil-based closer to 48.
Evening dew-point spread ≥5°F from 6–11 pm Temperature minus dew point from 6 pm to 11 pm. A small spread means dew will settle on fresh stain.
Daytime humidity ≤85% Daytime relative humidity slows dry time.
Wind ≤15 mph (brush or pad only up to 20 mph) Above 15 mph, spraying drifts; above 20 mph, dust and debris land in wet stain.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

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