Pool season · California
Arden-Arcade Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Arden-Arcade's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
The bar compresses Arden-Arcade's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 25–April 15 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 9. Wherever the today marker sits, the nearest color change is your next appointment.
The Arden-Arcade pool calendar
Opening — target April 1
Target April 1; the practical window runs March 25–April 15, and the 7-day mean crosses the 61°F threshold around April 15. Cold-water starts are the cheap ones.
Closing — deadline November 9
The window opens October 30 once water leaves the algae zone; the model deadline is November 9, a week ahead of the December 16 freeze normal.
Estimated water temperature by month
This is Arden-Arcade'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 48° | 51° | 56° | 59° | 65° | 71° | 77° | 78° | 76° | 70° | 60° | 51° |
Warmest water typically August–August (peaking near 78°F); heaters and covers shift any month up.
Email me when Arden-Arcade hits the closing window
Data: NOAA 1991–2020 climate normals via Sacramento 5 ESE (3.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.