For most Sacramento homes, cleaning the outside of your windows twice a year is a good baseline: once in late spring after pollen season, and once in fall after the dry, dusty summer. Add a third cleaning if you live near a busy road or construction, have sprinklers that hit the glass, or after a heavy wildfire smoke event. Businesses with street-facing glass usually need it more often.
Why Sacramento windows get dirty on a schedule
Sacramento's weather follows a predictable yearly pattern, and so does the dirt on your glass. Summers are nearly rainless and mostly cloudless[1], while most of the year's rain falls from November through February[1]. In between, spring brings a heavy dose of pollen. Each season leaves something different behind.
Spring: pollen
Oak and grass pollen can start circulating in the Sacramento area in late February, with grass pollen continuing into late spring and early summer[2]. Pine and other conifer pollen follows in late spring, and weed pollen peaks in late summer and fall[2]. On windows, that shows up as a yellow-green film on glass, sills and screens. Cleaning in the middle of peak season often means doing it twice, which is why we usually suggest waiting until the worst of spring pollen has passed.
Summer: dust and sun
Months without rain mean nothing rinses dust off your windows. In Sacramento County, the air district's inventory of coarse particulate matter (PM10) lists construction and demolition and paved road dust among the largest sources[3]. Homes near busy streets, new subdivisions or building projects tend to see dust build up on glass and sills faster. Strong Central Valley sun also makes every streak and speck stand out, especially on west- and south-facing windows in the afternoon.
Fall: dust plus smoke
By September and October, windows are carrying a full summer's worth of dust. In some years, wildfire smoke adds to it: Sacramento's air district has flagged unusually high particulate levels caused by wildfire smoke in multiple recent years, including 2018 and 2020 through 2022[4]. A fall cleaning clears that buildup before winter. Our article on exterior cleaning after wildfire smoke and pollen covers what to do after a smoky stretch.
Winter: rain doesn't do the job
Winter storms might seem like free window washing, but rain tends to move dirt around rather than remove it, and drops that dry on the glass can leave spots behind. If sprinklers also hit your windows, mineral spotting can build up all year; see hard water spots on windows for why that happens.
A simple schedule for Sacramento
| Property type | Suggested frequency | Best timing |
|---|---|---|
| Typical home | 2 times a year | Late spring (after peak pollen) and fall (after summer dust) |
| Home near busy roads, construction or open fields | 3 times a year | Late spring, late summer, and late fall |
| Home with sprinklers hitting the glass | 2–3 times a year, plus fixing the sprinkler heads | As spots appear |
| Home getting ready to sell | Once, right before listing photos | About a week before photos |
| Storefront or office with street-facing glass | Monthly to quarterly | Based on foot traffic and how visible the glass is |
These are starting points, not rules. The right schedule depends on how much the clean look of your windows matters to you and how quickly dirt comes back at your address.
Signs your windows are due
- Glare and haze when the sun hits the glass in the afternoon.
- A yellow or gray film you can see on sills and screens.
- White spots near sprinklers or downspouts.
- Cobwebs and insects collecting in frame corners.
- Screens that look dark or block light noticeably.
Pair window cleaning with the rest of the exterior
Dust and pollen don't stop at the glass. If your windows need attention, your siding, stucco, walkways and solar panels are probably collecting the same film. Many customers book windows together with a soft wash of the house exterior or solar panel cleaning, so the whole property is clean at once. And if you're considering a full service, our guide to professional window cleaning in Sacramento explains exactly what's included.
How LORS Cleaning can help
LORS Cleaning is based in Sacramento and serves everything within 100 miles, including Sacramento, Rancho Cordova, Citrus Heights and Elk Grove. We clean exterior glass, frames, sills and screens with eco-safe, biodegradable products. Request a free, exact estimate with no hidden fees, and if something isn't right, tell us within 24 hours and we'll come back and fix it free.
Quick answers
What's the best time of year to clean windows in Sacramento?
Late spring, after the worst of the pollen, and fall, after the dry summer dust. Cleaning during peak pollen often means the film comes right back.
Will winter rain clean my windows?
Not really. Rain tends to move dirt around rather than remove it, and drops that dry on the glass can leave spots.
How often should a storefront clean its windows?
Street-facing business glass usually needs cleaning monthly to quarterly, depending on traffic and how visible it is.
Sources
- Cline, G., Neigher, A., Bellinder, A. — National Weather Service, Sacramento. Climate of Sacramento, California (rev. 2010). https://www.weather.gov/media/sto/pdf/CLISAC2010.pdf
- DeFazio-Reilly, E. — Abridged (PBS KVIE). Why are allergies so bad right now? In Sacramento, the usual spring culprit is in the air (2026). https://www.abridged.org/?p=10510
- Sacramento Metropolitan Air Quality Management District. Second 10-Year PM10 Maintenance Plan for Sacramento County (2021). https://www.airquality.org/ProgramCoordination/Documents/PM10%20Second%20MP%20Final%20Draft%202021-07-23.pdf
- Sacramento Metropolitan Air Quality Management District. Air Quality Trends (accessed 2026). https://www.airquality.org/air-quality-health/air-quality-plans/air-quality-trends
