In Ontario, most homeowners open their pools from late April through May, once daytime temperatures are reliably in the teens. Waiting until the first hot weekend of June feels logical, but opening a little earlier usually means less work and a cleaner pool.
Why opening earlier often makes sense
- Algae loves warm water. Once the water climbs above about 15°C, algae can grow quickly under a cover. Opening while the water is still cool lets you circulate, filter and sanitize before a bloom starts.
- Easier clean-up. A pool opened in cool weather is usually clearer than one left under the cover into June.
- Better availability. Pool companies book up as the weather warms, so early requests get more choice of dates.
Signs you are ready to open
- Overnight lows are staying above freezing.
- Most leaves and seeds have dropped from nearby trees, or you are ready to keep skimming them.
- You have a plan for the cover: cleaning, folding and storing it.
What a professional opening includes
Poolmaster offers several opening packages so you only pay for what you need:
- Winter Cover Removal: drain, clean and fold the cover; clean the waterline, coping and deck; test stabilizer; reinstall deck equipment; de-winterize the filter, heater and pump.
- System Start-up: start and check the system, install the automatic cleaner and balance the water.
- Spring Vacuum Call: clean baskets, skim, vacuum, scrub the waterline and backwash. Some pools need two calls.
- Heater Clean & Light: basic heater cleaning, lighting and an operation check.
See the full details on our pool openings page.
Ready to book your opening? Request a quote or call 416-449-1450.
