Pool season · Arizona
Gilbert Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Gilbert'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.
Gilbert, AZ — 219 swim days a yearEach dot on the bar is one week of Gilbert's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (February 18–March 11), solid teal is swim season, and hollow amber is the closing window ending November 23. The black marker is today — its position against the colors is the entire executive summary.
The Gilbert 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 23
The window opens November 13 once water leaves the algae zone; the model deadline is November 23, a week ahead of the December 11 freeze normal.
Estimated water temperature by month
This is Gilbert'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° | 73° | 83° | 90° | 91° | 88° | 79° | 66° | 55° |
Warmest water typically June–October (peaking near 92°F); heaters and covers shift any month up.
Every station tells its own story: compare this curve with Flagstaff's pool season and Glendale's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Arizona season index.
Gilbert pool season FAQ
When should I open my pool in Gilbert, AZ?
Open by February 25 — the model places Gilbert's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Gilbert opening guide has the 12-step sequence.
When should I close my pool in Gilbert?
Close by November 23: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Gilbert closing guide sequences the work backward from that date.
How long is the swim season in Gilbert?
Gilbert averages 219 days a year with normal highs of 80°F or better — right on the statewide median. The Arizona season index ranks all 20 covered cities by the same metric.
How warm does pool water get in Gilbert?
An unheated pool near Gilbert typically peaks around 92°F in high summer and bottoms out near 51°F in winter, spending roughly 5 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 Gilbert hits the closing window
Data: NOAA 1991–2020 climate normals via Chandler Heights (8.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.