That yellow-green film coating every surface in Toronto from May to June? That's tree pollen — primarily oak, birch, and maple. A single oak tree produces 70 billion pollen grains per season. If you live near High Park, the Don Valley, or any mature canopy neighbourhood, your windows are fighting 100+ trees within 200m. Here's the science-based guide to timing your cleaning around pollen.
Toronto's Pollen Calendar
| Period | Source | Severity | Clean Windows? |
|---|---|---|---|
| April 1-15 | Elm, willow (early) | Low | ✅ Yes — best window |
| April 15-30 | Birch, maple start | Rising | ✅ Yes — still good |
| May 1-10 | Birch peak, oak starting | Medium | ⚠️ Last chance before peak |
| May 10-31 | Oak + birch + maple peak | EXTREME | ❌ Don't waste money |
| June 1-10 | Oak winding down, grass starting | High | ❌ Still too early |
| June 10-20 | Tree pollen falling, grass moderate | Declining | ⚠️ Possible — rain helps |
| June 20+ | Pollen season effectively over | Low | ✅ Great time to clean |
| Late April (cherry) | Cherry blossom sap (not pollen) | Sticky sap | ⚠️ Clean sap within 48hrs |
Worst Neighbourhoods for Pollen
Toronto neighbourhoods ranked by pollen exposure based on tree canopy density:
The Smart Scheduling Strategy
If you clean 2x/year: Late April (before pollen) + Early October (before freeze). This gives you the cleanest windows when it matters — spring/summer entertaining and fall pre-winter.
If you clean 3x/year: Late April + Late June (post-pollen) + Early October. The June cleaning removes the entire pollen season's deposits.
If you're in a high-pollen zone (🔴): Add a late June cleaning to your schedule — it's not optional. Your windows will be genuinely opaque by mid-June if you live near High Park or in a ravine neighbourhood.
Book Pre-Pollen Spring Cleaning
Late April spots filling fast. Get ahead of the pollen bomb.
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