Pool season · California
Hanford Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Hanford'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 Hanford's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 22–April 12 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 7. Wherever the today marker sits, the nearest color change is your next appointment.
The Hanford pool calendar
Opening — target March 29
Open by March 29 — a two-week head start on the April 12 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 7
Hold the cover until October 28, then winterize by November 7, a week ahead of the December 1 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Hanford'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 46° | 49° | 55° | 60° | 66° | 73° | 80° | 82° | 78° | 71° | 60° | 49° |
Warmest water typically July–September (peaking near 82°F); heaters and covers shift any month up.
Email me when Hanford hits the closing window
Data: NOAA 1991–2020 climate normals via Hanford 1 S (1.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.