Pool Calendar
When to open, when to close, and when to winterize before the first frost. Computed for your exact place from the 30-year climate record at your nearest station.
Showing Toronto. Search for your own town, or use your location.
Open, close, and a ten-day winterize reminder.
Opening weekend watch: Check the live forecast and work windows for your place on the Weather page before you pull the cover off.
Pool dates for major cities
Computed from each city's own station normals. Your town's dates may differ; use the planner above for your exact place.
| City | Open around | Close / winterize | Season | |
|---|---|---|---|---|
| Victoria | BC | June 18 | September 24 | 98 days |
| Vancouver | BC | June 8 | September 27 | 112 days |
| Kelowna | BC | June 2 | September 18 | 108 days |
| Calgary | AB | June 29 | September 2 | 65 days |
| Edmonton | AB | June 28 | August 29 | 62 days |
| Saskatoon Diefenbaker | SK | June 10 | September 5 | 87 days |
| Regina | SK | June 7 | September 2 | 87 days |
| Winnipeg Richardson | MB | June 4 | September 12 | 100 days |
| Sudbury | ON | June 6 | September 15 | 101 days |
| Ottawa Cda | ON | May 24 | September 25 | 124 days |
| Toronto Lester B. Pearson | ON | May 26 | September 29 | 127 days |
| Windsor | ON | May 15 | October 7 | 145 days |
| Montreal/Pierre Elliott Trudeau | QC | May 25 | September 26 | 124 days |
| Quebec/Jean Lesage | QC | June 7 | September 13 | 99 days |
| Fredericton | NB | June 8 | September 15 | 99 days |
| Halifax Stanfield | NS | June 14 | September 23 | 101 days |
| Charlottetown | PE | June 19 | September 21 | 94 days |
| Whitehorse | YT | n/a | n/a | n/a |
| Yellowknife | NT | June 29 | August 20 | 52 days |
Method: monthly mean temperature normals anchored mid-month, linear interpolation across 15 C (open) and 13 C (close), capped ten days before first frost. Read the full methodology.
Questions, answered plainly
When should I open my pool in Canada?
Open once the monthly mean temperature has settled above about 15 C and nights are reliably mild. In Toronto that is usually the second half of May; in Montreal or Ottawa, late May; in Calgary or Winnipeg, late May to early June; on the BC coast, April to early May. The date is computed from the 30-year climate record at your nearest station, not a national average.
When should I close and winterize my pool?
Close while the water is still warm enough to winterize properly, but no later than about ten days before the first hard frost. The tool above gives both the temperature-based close window and the frost hard-stop for your place. A freeze in the plumbing is the expensive mistake; the winterize date is the one to put in your calendar.
Can I keep a pool open year-round in Canada?
Only in mild coastal climates where winter monthly means stay high enough that the water rarely cools below 13 C. For most of the country the answer is no; the tool flags the few places where year-round is realistic.
How is the pool season length calculated?
From the spring crossing of 15 C to the earlier of the fall crossing of 13 C or ten days before the average first frost. It is a climate average, not a guarantee: watch the forecast and adjust for the season.