Pool season · Washington
Pasco Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Pasco 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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Pasco's swim season; the hollow teal run before it (April 23 to May 14) is when to open; the hollow amber run after is when to close, with October 4 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Pasco pool calendar
Opening — target April 30
Target April 30; the practical window runs April 23–May 14, and the 7-day mean crosses the 61°F threshold around May 14. Cold-water starts are the cheap ones.
Closing — deadline October 4
Hold the cover until September 24, then winterize by October 4, a week ahead of the October 11 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Pasco'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 34° | 36° | 42° | 50° | 57° | 65° | 72° | 75° | 69° | 58° | 46° | 37° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Pasco hits the closing window
Data: NOAA 1991–2020 climate normals via Pasco Tri Cities Airport (1.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.