Pool closing · State guide
When to Close Your Pool in Utah
Last updated: July 15, 2026 · 12 cities covered
Closing deadlines across Utah stretch about 35 days: Logan needs the cover on first (September 25), St. George last (October 30), and the statewide median deadline is October 10.
Each deadline is the model's two-clock compromise — ten days after the water leaves the algae zone, capped a week before the local 50% first-freeze date. City pages carry the live widget that flags early-freeze years and the full winterizing sequence.
| City | Window opens | Close by | First freeze (50%) |
|---|---|---|---|
| Layton | Sep 24 | Oct 4 | Oct 20 |
| Lehi | Sep 20 | Sep 30 | Oct 9 |
| Logan | Sep 15 | Sep 25 | Oct 2 |
| Ogden | Sep 29 | Oct 9 | Oct 23 |
| Orem | Sep 27 | Oct 7 | Oct 19 |
| Provo | Sep 30 | Oct 10 | Oct 21 |
| Salt Lake City | Oct 4 | Oct 14 | Nov 8 |
| Sandy | Sep 30 | Oct 10 | Oct 22 |
| South Jordan | Sep 30 | Oct 10 | Oct 22 |
| St. George | Oct 20 | Oct 30 | Nov 10 |
| West Jordan | Sep 30 | Oct 10 | Oct 22 |
| West Valley City | Oct 1 | Oct 11 | Oct 31 |
Dates are typical-year model outputs, not forecasts — each city guide carries the live widget that tracks the current year against them.
How to use these dates
Each "close by" deadline is the model's two-clock compromise for that city: ten days after its 7-day mean temperature falls back through 61°F (water goes algae-dormant soon after), but never later than a week before its 50% first-freeze date from the NOAA 1991–2020 normals. Closing inside the window seals cold, stable water under the cover; closing early seals a warm algae incubator instead.
Treat the dates as typical-year guidance, not forecasts. An early cold snap moves the real deadline — each city guide runs a live water-temperature widget that flags a 32°F night inside the 10-day forecast as urgent, and carries the full winterizing checklist in working order.