Pool season · Arizona
Maricopa Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Maricopa pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
The bar compresses Maricopa's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the February 18–March 11 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 17. Wherever the today marker sits, the nearest color change is your next appointment.
The Maricopa pool calendar
Opening — target February 25
Open by February 25 — a two-week head start on the March 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 17
The window opens November 14 once water leaves the algae zone; the model deadline is November 17, a week ahead of the November 24 freeze normal.
Estimated water temperature by month
This is Maricopa'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52° | 55° | 59° | 66° | 74° | 84° | 92° | 93° | 90° | 79° | 66° | 55° |
Warmest water typically June–October (peaking near 94°F); heaters and covers shift any month up.
Email me when Maricopa hits the closing window
Data: NOAA 1991–2020 climate normals via Maricopa 4 N (5.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.