Pool closing · State guide
When to Close Your Pool in Oklahoma
Last updated: July 25, 2026 · 6 cities covered
Closing deadlines across Oklahoma stretch about 6 days: Broken Arrow needs the cover on first (October 25), Lawton last (October 31), and the statewide median deadline is October 27.
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%) |
|---|---|---|---|
| Broken Arrow | Oct 16 | Oct 25 | Nov 1 |
| Edmond | Oct 19 | Oct 29 | Nov 5 |
| Lawton | Oct 22 | Oct 31 | Nov 7 |
| Norman | Oct 18 | Oct 27 | Nov 3 |
| Oklahoma City | Oct 16 | Oct 26 | Nov 2 |
| Tulsa | Oct 19 | Oct 28 | Nov 4 |
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.
What drives Oklahoma's closing deadlines
Long, blistering southern Plains summers keep pools busy from late spring well into fall, but Tornado Alley's violent spring storms and hail can disrupt opening season. Lawton holds the state's latest deadline (October 31), and the Oklahoma season index lists every other city's.