By the EverGlow Exteriors Team

Late April through May — after the last hard freeze and after the first big pollen drop — is the best time to clean windows in the Des Moines metro. Clean earlier and the weather undoes your money; wait too long and you spend the best months of the year looking through winter’s film. Here’s the timing logic, plus the one scheduling move that matters more than the date itself.

Rule 1: wait out the last hard freeze

Central Iowa’s average last frost lands in late April, and hard freezes can sneak in even after a string of 65-degree teaser days. A freeze after a cleaning isn’t a disaster, but it’s a tax: freeze-thaw pulls moisture and grit back across the glass, and March wind whips up field dust that resettles fast. Every year we get calls the first 70-degree week of March, and every year our honest answer is the same — we’ll happily take your money, but you’ll get more for it in five weeks.

Rule 2: let the first pollen wave land first

This is the one people miss. Des Moines tree pollen — maple and cedar early, then oak, which is the heavy hitter — peaks from mid-April into early May. Oak pollen in particular doesn’t just dust the glass; on damp mornings it sticks and films. Clean your windows April 10th and by April 25th they’ll wear a yellow-green haze like nothing happened.

So the target is simple: after the last freeze and after the main pollen dump. For most of the metro that means the last week of April through the end of May. Homes under heavy tree canopy — Walnut Creek in Urbandale, the Greenbelt side of Clive — should lean toward mid-May, when the oaks have finished. Newer, treeless streets can go earlier.

What about rain?

May is a wet month here, and people worry a rainstorm will wreck a fresh cleaning. Mostly it won’t — rain itself is fairly clean, and it’s dirty glass that streaks, not clean glass. What actually spots windows is what the rain splashes onto them (roof runoff, mulch splatter) and sprinkler overspray. So don’t schedule around the forecast; it’s a coin flip anyway. For what it’s worth, our service plan members get a 7-Day Rain Guarantee — rain inside a week of the visit and we’ll touch up the exterior glass free.

The real move: book ahead of the rush

Here’s the part that matters more than picking the perfect week. Everyone in the metro figures out their windows are dirty during the same first sunny stretch of April, and the calendar fills three-plus weeks out almost overnight. The people who get the prime mid-May slots booked them in March or early April.

• March: get your quote and pick your date. Nothing to clean yet — just claim the slot.
• Late April–May: we show up, winter and pollen come off, glass disappears.
• June onward: you enjoy the one stretch of the Iowa year when the windows are open anyway.

Or make it permanent: plan members get priority scheduling every spring, so the good weeks are theirs before the phone starts ringing — plus $25 to $75 off every visit.

What a spring visit should include

Spring is the deep-reset visit, so make sure whoever you hire does the whole window, not just the glass: exterior and interior panes, screens washed before they go up for the season, sills wiped, and tracks cleared of five months of freeze-thaw grit. That’s the standard scope of our window cleaning service — $8 to $16 per window, $150 minimum, exact quote up front. If winter left mineral haze or your storm windows fogged up from the inside, we cover what that takes in our posts on hard water stains and why windows look so rough after an Iowa winter.

Missed the spring window? Here’s plan B

If it’s already July and the glass never got its spring reset, don’t write off the year. A summer cleaning still earns its keep — it pulls off the pollen film before it bakes in harder, and it’s the visit that catches sprinkler spots while they’re still removable. Early June through August is also the least crowded stretch of our calendar, so scheduling is easy. The only genuinely bad plan is waiting for next spring while this summer’s sprinklers keep etching the first-floor glass. Clean now, then get on the calendar for fall, and by next April you’re back on the normal rhythm.

Claim your spring slot now

Quote today, clean in the right window. Same-week openings happen, but May doesn’t wait.

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