Pool season · California
Brentwood Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Brentwood'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 Brentwood's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 27–April 17 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 10. Wherever the today marker sits, the nearest color change is your next appointment.
The Brentwood pool calendar
Opening — target April 3
Target April 3; the practical window runs March 27–April 17, and the 7-day mean crosses the 61°F threshold around April 17. Cold-water starts are the cheap ones.
Closing — deadline November 10
Hold the cover until October 31, then winterize by November 10, a week ahead of the December 19 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Brentwood'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 47° | 50° | 55° | 59° | 64° | 70° | 75° | 76° | 74° | 70° | 60° | 51° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Brentwood hits the closing window
Data: NOAA 1991–2020 climate normals via Antioch Pumping Plt #3 (3.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.