Pool closing · State guide

When to Close Your Pool in South Carolina

Last updated: July 25, 2026 · 12 cities covered

Closing deadlines across South Carolina stretch about 30 days: Greenville needs the cover on first (October 22), Charleston last (November 21), and the statewide median deadline is November 4.

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.

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 South Carolina's closing deadlines

Subtropical heat opens South Carolina pools by mid-spring and holds them open deep into fall, with coastal hurricane season the main threat to Lowcountry schedules. Charleston holds the state's latest deadline (November 21), and the South Carolina season index lists every other city's.