How Often Should You Clean Your Windows in Colorado?

Twice a year suits most Front Range homes. But the honest answer depends on four local conditions, and if any of them apply strongly to your house, the general advice is wrong for you.

What actually dirties glass here

Irrigation

The single biggest factor, and the only one that causes permanent damage. Sprinkler overspray leaves mineral deposits that etch glass over time. If any head reaches your windows, you are on a clock — and in Denver metro, where water runs around 8.5 grains per gallon, that clock is considerably faster than in Colorado Springs.

Wind and plains dust

Anywhere east of the Springs — Falcon, Peyton, eastern Aurora — has essentially no windbreak. Screens load with fine grit and redeposit it onto clean glass with the first rain. Golden regularly records the strongest gusts on the Front Range, with the same effect on west-facing elevations.

Elevation and sun

At 6,000 feet UV intensity is roughly 25 percent higher than at sea level, and Woodland Park sits at 8,465. Strong UV bakes contaminants onto glass harder, so residue that wipes off easily at lower elevation needs proper treatment here.

Tree cover

Mature canopy in Old Colorado City, the Broadmoor, Washington Park or downtown Littleton produces organic staining on shaded north elevations. Pine areas — Woodmoor, the Pinery, Genesee — add pitch, which needs a solvent and never comes off by scrubbing.

Realistic frequencies

• Most homes — twice a year, spring and fall
• Heavy tree cover or active irrigation on the glass — three times, adding mid-summer
• Minimal trees, no overspray, low wind exposure — once a year is defensible
• Storefront and restaurant glass — weekly or biweekly; entry doors take all the handprints
• Commercial buildings — quarterly to twice yearly, with entry glass on a tighter cycle

When to schedule matters more than how often

Late spring, after cottonwood and pollen have finished, is the highest-value single cleaning of the year. Do it earlier and you clean the glass just before the messiest few weeks.

Autumn, after leaf drop, is the second. It also clears summer irrigation deposits before they sit through winter.

Winter

Exterior cleaning is practical down to about freezing. Below that, water freezes on the glass before it can be cleared and the result is worse than leaving it. Any company that agrees to exterior work in a hard freeze is going to disappoint you.

Interior work is unaffected by weather, which makes January and February the right months for interiors, screens, tracks and anything you have been putting off.

The cheaper pattern most people miss

Alternate a full interior-and-exterior service with an exterior-only visit. The outside takes nearly all the weather; interiors soil far more slowly unless you have pets or a wood stove. That pattern keeps the glass ahead of the damage at roughly two thirds the annual cost.

If you want this done

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