Pool opening · State guide
When to Open Your Pool in South Carolina
Last updated: July 15, 2026 · 12 cities covered
South Carolina's opening calendar spans about 27 days. The earliest model date belongs to Beaufort (March 11), the latest to Greenville (April 7), and the statewide median lands on March 26.
Every date is the same model — two weeks ahead of the day the local 7-day mean temperature crosses 61°F — applied to each city's own NOAA normals station. Click through for the live water estimate, the full window, and the 12-step checklist.
| City | Open by | Window opens | 61°F crossing |
|---|---|---|---|
| Beaufort | Mar 11 | Mar 4 | Mar 25 |
| Charleston | Mar 13 | Mar 6 | Mar 27 |
| Columbia | Mar 25 | Mar 18 | Apr 8 |
| Florence | Mar 21 | Mar 14 | Apr 4 |
| Greenville | Apr 7 | Mar 31 | Apr 21 |
| Mauldin | Apr 7 | Mar 31 | Apr 21 |
| Mount Pleasant | Mar 23 | Mar 16 | Apr 6 |
| Myrtle Beach | Apr 2 | Mar 26 | Apr 16 |
| North Charleston | Mar 13 | Mar 6 | Mar 27 |
| Rock Hill | Mar 28 | Mar 21 | Apr 11 |
| Spartanburg | Apr 2 | Mar 26 | Apr 16 |
| Sumter | Mar 28 | Mar 21 | Apr 11 |
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 "open by" date is two weeks ahead of that city's own 61°F crossing — the day its 7-day mean temperature (highs and lows averaged, from the nearest NOAA 1991–2020 normals station) reaches the level where unheated pool water starts climbing toward the 65°F algae-growth zone. Opening inside the window means starting up in cold, algae-resistant water: a single label-dosed shock instead of a green-water recovery, and a shopping trip while South Carolina stores are still fully stocked.
Dates are typical-year guidance, not forecasts. A warm or late spring shifts the real-world moment by a week or two in either direction — every city guide carries a live water-temperature widget that tracks the current year against these normals, plus the full 12-step opening checklist sequenced to its local window. New to the process? Start with the generic how-to-open guide and the chemicals shopping list, then come back for your city's dates.