Pool Season by City: When to Open & Close, State by State

"When should I open my pool?" is a local question — the answer is six weeks apart between Minneapolis and Dallas. Pick your state for city-by-city dates from 1991–2020 NOAA temperature records.

Alabama 3 cities
Alaska 3 cities
Arizona 3 cities
Arkansas 2 cities
California 5 cities
Colorado 3 cities
Connecticut 2 cities
Delaware 2 cities
District of Columbia 1 city
Florida 4 cities
Georgia 3 cities
Hawaii 2 cities
Idaho 3 cities
Illinois 3 cities
Indiana 3 cities
Iowa 3 cities
Kansas 2 cities
Kentucky 2 cities
Louisiana 3 cities
Maine 3 cities
Maryland 3 cities
Massachusetts 3 cities
Michigan 4 cities
Minnesota 3 cities
Mississippi 3 cities
Missouri 3 cities
Montana 3 cities
Nebraska 3 cities
Nevada 3 cities
New Hampshire 2 cities
New Jersey 3 cities
New Mexico 3 cities
New York 4 cities
North Carolina 3 cities
North Dakota 2 cities
Ohio 3 cities
Oklahoma 2 cities
Oregon 4 cities
Pennsylvania 4 cities
Rhode Island 1 city
South Carolina 3 cities
South Dakota 2 cities
Tennessee 3 cities
Texas 6 cities
Utah 3 cities
Vermont 2 cities
Virginia 3 cities
Washington 3 cities
West Virginia 2 cities
Wisconsin 3 cities
Wyoming 3 cities

How the dates work

Each city page shows an opening window and a closing window: the stretch when that city's daily average air temperature moves through the low-to-mid 60s°F, judged against its own 1991–2020 NOAA station records. Water lags air by a week or two, so those crossings mark when an unheated pool becomes — and stops being — genuinely pleasant. Every page states the assumption plainly, because a heater, solar cover, or shady lot rewrites the dates.

Prefer to type a ZIP code? Use the pool season lookup. Planning the whole year? The state pages under when to open and when to close compare every city in your state.