Pool season · California
Madera Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Madera'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.
Madera, CA — 154 swim days a yearEach dot on the bar is one week of Madera's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 31–April 21), solid teal is swim season, and hollow amber is the closing window ending November 2. The black marker is today — its position against the colors is the entire executive summary.
The Madera pool calendar
Opening — target April 7
Open by April 7 — a two-week head start on the April 21 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 2
Hold the cover until October 23, then winterize by November 2, a week ahead of the November 27 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Madera'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 45° | 48° | 53° | 58° | 64° | 72° | 78° | 80° | 77° | 69° | 58° | 48° |
Warmest water typically July–August (peaking near 80°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Los Angeles's pool season and Manteca's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Madera pool season FAQ
When should I open my pool in Madera, CA?
Open by April 7 — the model places Madera's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Madera opening guide has the 12-step sequence.
When should I close my pool in Madera?
Close by November 2: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Madera closing guide sequences the work backward from that date.
How long is the swim season in Madera?
Madera averages 154 days a year with normal highs of 80°F or better — about 6 days later than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Madera?
An unheated pool near Madera typically peaks around 80°F in high summer and bottoms out near 45°F in winter, spending roughly 2 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 Madera hits the closing window
Data: NOAA 1991–2020 climate normals via Madera (2.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.