Pool season · Pennsylvania
State College Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one State College pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
State College, PA — 44 swim days a yearEach dot on the bar is one week of State College's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 30–May 21), solid teal is swim season, and hollow amber is the closing window ending October 1. The black marker is today — its position against the colors is the entire executive summary.
The State College pool calendar
Opening — target May 7
Open by May 7 — a two-week head start on the May 21 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 1
Hold the cover until September 21, then winterize by October 1, a week ahead of the October 26 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is State College's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29° | 28° | 33° | 44° | 56° | 65° | 71° | 72° | 67° | 57° | 46° | 36° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Scranton's pool season and York's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Pennsylvania season index.
State College pool season FAQ
When should I open my pool in State College, PA?
Open by May 7 — the model places State College's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The State College opening guide has the 12-step sequence.
When should I close my pool in State College?
Close by October 1: cool water keeps its winter chemistry, but freeze damage is the hard stop. The State College closing guide sequences the work backward from that date.
How long is the swim season in State College?
State College averages 44 days a year with normal highs of 80°F or better — about 8 days later than the Pennsylvania median. The Pennsylvania season index ranks all 12 covered cities by the same metric.
How warm does pool water get in State College?
An unheated pool near State College typically peaks around 72°F in high summer and bottoms out near 27°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when State College hits the closing window
Data: NOAA 1991–2020 climate normals via State College (0.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.