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Bighorn Painting Flags Closing Exterior Painting Window as Colorado Overnight Temperatures Approach the Coating Threshold

Most exterior coatings will not bond properly below 50°F. With the Front Range season typically running late May through early October, the Arvada contractor is advising homeowners on what can still be scheduled and what should wait for spring.

ARVADA, Colorado — September 24, 2026

Bighorn Painting, a residential and commercial painting contractor serving Arvada and Jefferson County, is advising Front Range homeowners that the 2026 exterior painting season is approaching its close, and outlining which work can still be completed this year and which should be scheduled for spring.

The constraint is chemical rather than commercial. Most exterior coatings will not bond properly below approximately 50°F, and the manufacturers' application guidance generally requires overnight lows to stay above roughly 35°F. Along the Front Range, that puts the reliable exterior window from late May through early October, with September a genuinely good month and October increasingly a matter of watching the forecast.

Why the shoulder weeks are different

Early fall is in some respects the best time of year for exterior work in Colorado. Daytime temperatures commonly sit in the 60°F to 80°F range, which lets each coat set without the bubbling or premature skinning that midsummer heat can cause. Afternoon storm activity, which peaks through June and July, has generally subsided.

What changes in late September and October is the overnight low. A coating applied at a comfortable 65°F in the afternoon may be sitting at 34°F by four in the morning, and cure is not finished when the crew packs up. A job that looked fine on the day can fail the following spring.

The paint does not care what the forecast said at noon. It cares what happened at four in the morning while it was still curing. Bighorn Painting

What Colorado does to exterior paint

The firm notes that Front Range conditions shorten coating life relative to most of the country, which is why timing and preparation matter more here than the price difference between contractors usually does.

• Ultraviolet exposure. At Front Range elevations the thinner atmosphere filters substantially less UV than at sea level, and industry guidance commonly puts the increase around 25%. South and west elevations fade first and fastest.
• Temperature swings. Thirty to forty degree variations within a single day cause siding and trim to expand and contract, which is what produces cracking and peeling at joints and fastener points.
• Hail. Colorado's hail season runs roughly April through September, with the highest frequency in June and July. Painted soffit, fascia and trim on windward elevations take impact damage alongside roofs.
• Freeze-thaw. Moisture that gets behind a failing coating expands when it freezes, which turns a small failure into a large one over a winter.

On HOA properties

Bighorn Painting notes that homeowners in HOA-governed neighborhoods should account for approval timelines when deciding between this season and next. Color approval can take weeks, and a homeowner who starts the approval process in October frequently finds that the window has closed by the time it completes — which makes starting the paperwork now the practical route to an early spring start.

Availability

Bighorn Painting serves Arvada and Jefferson County, including Olde Town, West Woods, Candelas and Leyden Rock, for residential and commercial properties. Estimates can be scheduled at bighornpainting.com or by telephone at 720-912-4676.

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