Best Time of Year to Clean House Windows in Quebec
The best time to clean house windows in Quebec is late April to early June, once overnight frost has ended and before pollen peaks, with a second exterior clean in September or October after the leaves and sap have had their season. Avoid freezing days, since water and cleaning solution can freeze on the glass, and avoid hot, direct sun, which dries the glass too fast and leaves streaks. For most Greater Montréal homes, two exterior cleans a year (spring and fall) keep the glass clear all year.
Month by month in Quebec
| Period | Exterior windows | Why |
|---|---|---|
| December to March | Not recommended | Freezing temperatures, ice on frames; interior glass can be done any time |
| April to May | Best main clean | Removes road-salt film and winter grime, before the heavy pollen weeks |
| June to August | Good, on cloudy or shaded mornings | Fine for a refresh; avoid midday sun on south and west glass |
| September to October | Best second clean | Clears sap, leaf grit and summer dust before winter |
| November | Possible only on mild days | The exterior season is ending; interior glass still works |
Why spring is the main clean
From November to March, exterior glass collects salt spray, dried snowmelt and a grey film left by freeze and thaw cycles. Cleaning in April or May removes it all at once, before pollen and seed fluff add a new layer. It is also the right moment to look at screens and sills for winter damage before bug season.
Why a fall clean is worth it
Summer leaves tree sap, aphid honeydew, spider webs and fine leaf grit on the glass. If it stays there through the first snow, the spring clean takes longer and the windows look dull through the darkest months, when low light makes every mark visible. A September or October visit clears it first.
What temperature and weather work best
- Above freezing. Exterior cleaning needs temperatures above 0 °C so water does not freeze on the glass or in the frames.
- Overcast or shade. Cooler, cloudy conditions slow drying and help the glass finish streak-free.
- Dry stretch. A day with little wind and no rain forecast for a few hours keeps fresh glass clean.
How Altara handles the season
Altara cleans the exterior of homes in Greater Montréal using pure deionized water on a water-fed pole, which reaches up to three storeys from the ground. Exterior work runs from roughly March to November, while interior glass can be booked year-round as an add-on. Quarterly, bi-monthly and monthly plans earn a 10%, 15% or 20% discount, and bi-annual or annual plans come with automated reminders. If a streak shows up, report it within 24 hours and the crew returns at no cost. You can see your window-count tier on the pricing page and book through the contact form.
Frequently asked questions
When should I clean my windows in Quebec?
Late April to early June is the best time for the main exterior clean, and September or October works well for a second one. Both avoid freezing weather and the hottest part of summer.
Can I clean windows in winter in Quebec?
Exterior cleaning is difficult below freezing because the water can freeze on the glass and frames. Interior glass can be cleaned any time of year, so winter is a good moment for it.
How often should house windows be cleaned in Quebec?
Twice a year, in spring and fall, suits most homes. Houses near busy roads, under mature trees or on the water can benefit from a quarterly schedule.
Is it better to clean windows on a cloudy day?
Yes. Cloud or shade slows drying, which reduces streaks. Direct midday sun on south and west windows dries the cleaning water too quickly.
Ready to book your seasonal clean? Request a visit and pick the window-count tier that matches your home.