When Is the Best Time of Year to Pressure Wash a House?

How Kansas City weather drives the schedule

KC sits in the algae belt: humid summers, shaded north walls, and oak-and-maple neighborhoods that drop pollen, tassels, and shade in equal measure. Gloeocapsa magma — the black streaking on roofs — and green wall algae both accelerate when nights stay warm and damp, roughly June through September here. A wash timed just before or just after that window buys the longest-looking results.

Spring (late March – May): the reset

Spring washing clears winter grime, salt film, and the first pollen dump, and puts detergent protection on the wall before the growth season starts. It is also our busiest season — May books out fast — so the pro move in KC is scheduling in late March or April, right as redbud season starts. Pair it with exterior window cleaning and the whole house resets at once.

Summer (June – August): perfectly fine, mind the heat

Nothing wrong with a summer wash — detergents just dry faster on 95°F siding, which is why crews work shaded sides and morning hours. If your house already turned green by July, do not wait for fall: growth compounds, and the longer algae feeds, the harder the stain fights back.

Fall (September – early November): the finisher

Fall is KC’s underrated washing season: summer growth comes off, the house is clean for holiday guests and photos, and it pairs naturally with gutter cleaning once the first leaf drop is down. Concrete also benefits before winter — clean, sealed driveways and walks shrug off ice-melt salt far better than dirty ones.

Winter (December – February): windows of opportunity

Soft washing works fine on days above about 40°F, and KC gets plenty of them even in January. Winter is our quietest season, which means the fastest scheduling of the year. What we skip: freezing days, and any job where overspray could ice a walkway.

The schedule that beats any single season

Houses in shaded or humid spots do best on a standing rhythm — most KC homes look their best washed every 12–24 months (here is how often to wash a house in Kansas City). Our 2-year written guarantee is built around that reality: if algae beats the schedule, the re-clean is on us.