Pool season · California
Folsom Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Folsom'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 Folsom'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 Folsom 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
Monthly averages of the site's water model run on Folsom'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 Folsom hits the closing window
Data: NOAA 1991–2020 climate normals via Sacramento 5 ESE (16.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.