Pool season · Pennsylvania
York Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
York's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
The bar compresses York's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 17–May 8 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 11. Wherever the today marker sits, the nearest color change is your next appointment.
The York pool calendar
Opening — target April 24
Open by April 24 — a two-week head start on the May 8 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 11
The window opens October 1 once water leaves the algae zone; the model deadline is October 11, a week ahead of the October 19 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on York's own normals — the shape of a typical year, not a forecast. The widget above shows where the current year actually sits.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 33° | 32° | 38° | 48° | 59° | 68° | 74° | 75° | 71° | 61° | 50° | 39° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when York hits the closing window
Data: NOAA 1991–2020 climate normals via York 3 SSW Pump Station (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.