Pool season · California
Hanford Pool Season: the Year on One Bar
Last updated: July 25, 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.
Hanford, CA — 168 swim days a yearThe 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.
Every station tells its own story: compare this curve with Glendale's pool season and Hawthorne's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Hanford pool season FAQ
When should I open my pool in Hanford, CA?
Open by March 29 — the model places Hanford's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Hanford opening guide has the 12-step sequence.
When should I close my pool in Hanford?
Close by November 7: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Hanford closing guide sequences the work backward from that date.
How long is the swim season in Hanford?
Hanford averages 168 days a year with normal highs of 80°F or better — right on the statewide median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Hanford?
An unheated pool near Hanford typically peaks around 82°F in high summer and bottoms out near 46°F in winter, spending roughly 3 months at or above the 78°F comfort line most swimmers prefer. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
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.