Pool season · Arizona
Glendale Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Glendale'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.
Glendale, AZ — 220 swim days a yearEach dot on the bar is one week of Glendale'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 16–March 9), solid teal is swim season, and hollow amber is the closing window ending November 24. The black marker is today — its position against the colors is the entire executive summary.
The Glendale pool calendar
Opening — target February 23
Target February 23; the practical window runs February 16–March 9, and the 7-day mean crosses the 61°F threshold around March 9. Cold-water starts are the cheap ones.
Closing — deadline November 24
Hold the cover until November 14, then winterize by November 24, a week ahead of the December 15 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Glendale'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52° | 55° | 60° | 66° | 74° | 83° | 91° | 92° | 89° | 79° | 67° | 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 Gilbert's pool season and Goodyear's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Arizona season index.
Glendale pool season FAQ
When should I open my pool in Glendale, AZ?
The site model recommends opening by February 23 — about two weeks before Glendale's 7-day mean temperature crosses 61°F, while the water is still too cold for algae. The step-by-step sequence is in the Glendale opening guide.
When should I close my pool in Glendale?
Winterize by November 24. The model holds the deadline a week ahead of Glendale's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Glendale closing guide.
How long is the swim season in Glendale?
Glendale averages 220 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 Glendale?
An unheated pool near Glendale typically peaks around 92°F in high summer and bottoms out near 52°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 Glendale hits the closing window
Data: NOAA 1991–2020 climate normals via Youngtown (4.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.