How Often Should You Clean Windows in Plano? A Seasonal Month-by-Month Calendar

For most Plano homes, clean windows twice a year — once after spring pollen, once before the holidays — but sprinkler overspray on Lake Lavon hard water can push the exterior to every 3–4 months. Here's the month-by-month calendar we've built over 26 years of cleaning windows on Plano houses.

There's a standard answer floating around for "how often": twice a year. One national window-cleaning company caps its Plano advice at three fixed dates — April, July, and October — with no reasoning. The honest version is more useful, because Plano isn't a generic market. It's cedar and oak pollen, a four-month thunderstorm window, and some of the hardest municipal water in Texas hitting glass that a lawn sprinkler sprays every morning.

So here's the real schedule, month by month, and why each window of the year calls for what it does.

How Often Should Windows Be Cleaned in a Place Like Plano?

Twice a year minimum — spring and fall. Add a mid-summer exterior check if you have sprinklers or pollen-heavy trees, because Plano's hard water means sprinkler overspray can call for attention every 3–4 months.

That three-part answer is the one that holds up over a working season. Spring cleans off the pollen film. Fall clears the ragweed and preps your glass for holiday light. Summer is the catch-relief valve: if a sprinkler head is aimed at your windows, or a mature oak overhangs the driveway, you'll want that extra exterior pass before the minerals bond.

The Plano Year: Month-by-Month Window Cleaning Calendar

This is the table we actually schedule from. What hits your glass, what to do, and when to book.

• ✓January — Cedar pollen blows in; frosts can film the glass — Leave it — dormant stretch, minimal buildup — Hold
• ✓February — Cedar winds down, elm picks up — Book your spring clean before oak season — Book now (slots fill by late March)
• ✓March — Oak starts, storm season opens — First exterior clean of the year — Clean in early-to-mid March
• ✓April — Oak pollen peak; thunderstorm mud — Keep glass dry; plan the post-pollen pass — Watch, clean at month end if film is heavy
• ✓May — Oak/pecan tail, grass pollen — Second clean after the oak peak — Book for late May–early June
• ✓June — Bermuda grass pollen; storms taper — Mid-summer cleaner if you have sprinklers — Book mid-summer refresh if needed
• ✓July — Lingering haze; sprinkler bake on glass — Inspect for water-spot etching (see Sprinkler Check) — Touch up exterior only
• ✓August — Ragweed begins; heat bakes on film — No scheduled clean — inspect — Hold
• ✓September — Ragweed; pre-holiday buildup — Survey interior + exterior, plan fall clean — Book fall clean
• ✓October — Holiday prep; second pollen wave — Fall exterior clean before the holidays — Clean in October — do not wait
• ✓November — Leaf drop, ragweed fades — Gutter clean with your exterior pass — Clean gutters + glass together
• ✓December — Dormant stretch — Nothing needed unless pre-holiday missed — Complete by early December

Why Plano Is Not "Twice a Year" Territory

Three local factors stack up to make a bare twice-a-year schedule the floor, not the plan. If any of them apply to your property, you're on the 3–4 month cadence.

1. Hard water. Plano draws much of its municipal supply from Lake Lavon through the North Texas Municipal Water District. NTMWD water runs measurably hard — city water-quality reports and third-party CCR readings put Plano in the hard-to-very-hard range. Every cycle of a sprinkler deposits calcium and magnesium on glass. Done seasonally, that's a stain. Left to bake through a Texas summer, those minerals can bond into the glass itself — etching that no home cleaner removes.

2. Sprinkler overspray. Plano lawns irrigate heavily from spring through fall. If a head is angled toward the house, your windows are being sprayed with mineral-laden water on a timer, whether you notice it or not. This is the single most common reason a Plano home needs an extra exterior pass that a "twice a year" national guide never mentions.

3. The pollen package. Few markets hand you a three-season pollen year. Cedar in winter, oak and pecan in spring, ragweed in fall — each leaves its own film. Combined with hard water, that film is what bakes into a haze you can't just wipe off.

The bridge between scheduling and stains is the same mineral: sprinkler water left to dry is how most Plano hard-water spots are born in the first place. If you're already seeing white residue on glass, see our guide on hard water removal for Plano windows.

Pollen Calendar: When the Film Hits Plano Glass

Plano doesn't have one pollen season. It has a relay.

• ✓January–February — Cedar. Mountain cedar rides in on the cold fronts and is the heaviest winter pollen in North Texas. On a window, cedar is fine dry dust that shows quickly but wipes off without leaving a stain.
• ✓Late February–May — Oak and pecan. This is the big one. Oak peels during a stretch that runs through April, and mature pecan trees in established West Plano and Willow Bend drop their own load. In a hard April with oak counts at their North Texas peak, exterior glass can film over in a couple of weeks, per the North Texas allergy calendars and IQAir's Plano pollen data.
• ✓May–August — Grass. Bermuda and other grass pollens carry an amber film. Combined with low humidity, this is when film hangs on windows longest.
• ✓August–November — Ragweed. A second, lighter but real season turns up ahead of the holidays, which is one more reason the fall clean matters.

The worst window for window cleaning is the January–April stretch, when cedar hands off to oak without a gap — which is why we tell homeowners to get their spring clean done in March, before the worst of the oak wave.

Storm Season and Your Schedule

DFW severe thunderstorm season runs roughly March through June (NWS Fort Worth severe-weather outlook). The storms bring three things onto your glass: wind-driven rain that deposits mud and red clay, hail that can pit glass, and sideways rain that flushes pollen onto the surface rather than off it.

What that means for timing:

• ✓If you book your spring clean in early-to-mid March, you're ahead of the worst storm window and the oak peel.
• ✓If a round of storms hits in April or May and your glass ends up mud-speckled, that's a touch-up, not a full redo — unless minerals from the rain have already dried and baked on a hot April afternoon, in which case you've effectively fast-forwarded to hard-water territory.
• ✓Plan the fall clean after storm season winds down in June or July, so you're not chasing streak-prone conditions.

The Sprinkler Check: How to Know If Your Windows Need a Summer Clean

Thirty seconds, on a dry day. This is the test we walk homeowners through when they call unsure whether they need a summer pass.

Step 1 — Look at the glass at an angle in late-morning light. Hold your phone screen flat against the outside pane so you can read the reflection. If you see a fine white film or milky haze that a dry cloth won't fully lift, minerals have deposited — that's the sprinkler bake.

Step 2 — Feel the glass with a clean fingertip. Water alone should feel slick. If the surface feels gritty or rough, you're not looking at dust; you're feeling mineral deposits that have begun to set.

Step 3 — Decide. A just-waterspotted window is washed off by a professional exterior pass. A rough, etched one needs restoration treatment — a different job that no squeegee will fix.

In Plano's hard water, that distinction is worth paying attention to, because the gap between "a clean will fix it" and "this needs mineral removal" is roughly one idle summer. If you're seeing spots that won't come off, that's the flag to move your clean up rather than wait for the fall.

How to Know It's Time: A 3-Question Checklist

Not sure where you are in your own schedule? Run these three checks in about a minute.

1. The push test. Press your palm flat against the outside of a shaded window, hold for a second, and pull away. A distinct palm print left in a film you can see means there's a surface layer ready to wash off. No visible print means it's still basically clean — you can wait.

2. The glare test. Step back and look at the window at a low angle in morning or evening light. If you can make out streaks, milling, or an even haze you can't see head-on, there's a buildup layer. Streaks mean a poor previous clean; an even haze usually means minerals.

3. The streak test. Mist the glass with plain water from a spray bottle and watch how it sheets. Clean glass beads and drains in an even curtain. If the water breaks into separate droplets that cling or dry as little white dots, you've got mineral residue — that's the hard-water signal, and it won't go away with a dry-wipe.

These are the same checks the owner runs at the start of a job, by the way — not to quote you more work, but to tell you honestly whether a standard clean handles it or whether you're actually looking at hard-water spots that need a treatment pass.

What a Professional Seasonal Clean Includes (Screens + Tracks Every Time)

Here's a detail that matters more than most homeowners expect: a proper residential clean includes the screens and tracks on every pass, not as an add-on. Screens catch the same pollen, dust, and mineral spray the glass does, then transfer that grime straight back onto a freshly cleaned window within a week. A clean that skips the screens is a clean that doesn't last.

Screens and tracks are the reason a professional cleaning day retains its clarity noticeably longer than a quick DIY wash. Once the mesh is clean and the track is cleared of silt, glass stays clear between visits, which is part of why the three-times-a-year cadence holds for so many of our Plano street return customers.

For a rough sense of what a clean should run you in this market, our local window cleaning cost guide lays out single- and two-story figures with the hard-water add-on itemized.

Book Your Plano Window Cleaning

Put your Plano schedule in motion — free instant quote, and the owner answers the phone. Call or text Shane Harlen at (972) 527-9400, or request a quote online. You talk to the person who does the work, and we'll tell you up front whether your windows need a standard clean or hard-water treatment before we ever quote you one.

Frequently Asked Questions

Absolute Window Washing has cleaned windows across Plano, Frisco, McKinney, Allen, and the North Dallas area for over 26 years. If your windows look like they need a standard clean or a hard-water treatment, we'll tell you up front — the owner answers the phone. Call or text Shane Harlen at (972) 527-9400, or request a free estimate online.