Most Toronto pools close between early September and mid-October. The right time is a balance between enjoying the last warm days and finishing before the first hard frost puts your plumbing at risk.
Why many owners wait for cooler water
Closing while the water is still warm gives algae a head start under the cover. Once water temperatures drop to around 15°C or lower, algae growth slows a lot, and the pool is more likely to open clean in spring.
The deadline: before freezing nights
Water left in pipes, the pump, the filter or the heater expands when it freezes and can crack equipment and underground lines. The lines need to be blown out and plugged, and the equipment drained, before freezing nights arrive. In the GTA that is often mid- to late October, but it varies year to year.
Trees and leaves
If your yard has large deciduous trees, think about when the leaves fall. Some owners close after most leaves have dropped. Others close earlier and add a mesh leaf cover on top of the winter cover.
What a complete closing includes
Poolmaster’s complete winterizing service includes a spot vacuum, lowering the water level, removing jets and lights from the niche, draining the pump, filter and heater, blowing out and plugging the lines, removing deck equipment, balancing chemistry, adding shock and algaecide, and installing your winter cover. Read more on our pool closing page, or see our pool closing checklist.
Book your closing before the fall rush. Request a quote or call 416-449-1450.
