Pool season · California
Pasadena Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Pasadena 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 Pasadena's swim season; the hollow teal run before it (February 28 to March 21) is when to open; the hollow amber run after is when to close, with November 29 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Pasadena pool calendar
Opening — target March 7
Target March 7; the practical window runs February 28–March 21, and the 7-day mean crosses the 61°F threshold around March 21. Cold-water starts are the cheap ones.
Closing — deadline November 29
The window opens November 19 once water leaves the algae zone; the model deadline is November 29, a week ahead of the January 7 freeze normal.
Estimated water temperature by month
This is Pasadena'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 56° | 57° | 59° | 62° | 65° | 68° | 74° | 77° | 77° | 73° | 66° | 58° |
The curve peaks near 78°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Pasadena hits the closing window
Data: NOAA 1991–2020 climate normals via Pasadena (0.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.