Pool season · California
Fairfield Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Fairfield's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
The bar compresses Fairfield's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 4–April 25 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 Fairfield pool calendar
Opening — target April 11
Target April 11; the practical window runs April 4–April 25, and the 7-day mean crosses the 61°F threshold around April 25. Cold-water starts are the cheap ones.
Closing — deadline November 9
Hold the cover until October 30, then winterize by November 9, a week ahead of the December 14 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Fairfield'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° | 50° | 54° | 58° | 62° | 68° | 73° | 74° | 73° | 69° | 60° | 51° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Fairfield hits the closing window
Data: NOAA 1991–2020 climate normals via Fairfield (2.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.