Pool season · State index
Arizona Pool Season 2026: Opening & Closing Dates by City
Last updated: July 25, 2026 · 20 cities covered
Both halves of the pool year for all 20 covered Arizona cities. The median calendar runs February 25 to November 25. Every row links to a one-page season overview with the live water-temperature model; the opening and closing hubs carry the full checklists.
Arizona: a long-season pool state| City | Open by | Close by | 80°F+ days |
|---|---|---|---|
| Avondale | Feb 15 | Nov 27 | 226 |
| Buckeye | Feb 15 | Nov 27 | 226 |
| Casas Adobes | Mar 7 | Nov 23 | 224 |
| Chandler | Feb 20 | Nov 28 | 245 |
| Flagstaff | Jun 2 | Sep 17 | 52 |
| Gilbert | Feb 25 | Nov 23 | 219 |
| Glendale | Feb 23 | Nov 24 | 220 |
| Goodyear | Feb 16 | Nov 30 | 231 |
| Maricopa | Feb 25 | Nov 17 | 241 |
| Mesa | Feb 24 | Nov 28 | 229 |
| Peoria | Mar 6 | Nov 22 | 210 |
| Phoenix | Feb 22 | Nov 28 | 212 |
| Prescott Valley | May 4 | Oct 13 | 122 |
| Queen Creek | Feb 25 | Nov 23 | 219 |
| San Tan Valley | Feb 25 | Nov 23 | 219 |
| Scottsdale | Mar 7 | Nov 26 | 187 |
| Surprise | Mar 6 | Nov 22 | 210 |
| Tempe | Feb 20 | Nov 28 | 245 |
| Tucson | Feb 26 | Nov 26 | 218 |
| Yuma | Jan 26 | Dec 7 | 241 |
What the columns mean
"Open by" is the recommended spring date — two weeks before the city's 7-day mean temperature crosses 61°F, the model's proxy for water approaching the 65°F algae-growth zone. "Close by" is the fall deadline — ten days after the water leaves that zone, capped a week ahead of the local 50% first-freeze date. "80°F+ days" counts days whose normal high reaches 80°F: the length of the true warm-swim season, and the fairest single number for comparing Arizona cities against each other.
Every figure comes from each city's own NOAA 1991–2020 normals station (named in its guide's footer), so neighboring cities can legitimately differ by a few days. The season overview linked from each row adds the live water-temperature model and the full-year season bar; the state hubs above carry the step-by-step checklists.
Swim-season length across Arizona
The fairest way to compare Arizona cities is the number of days with 80°F+ normal highs — the practical warm-swim season. Every bar links to that city's one-page season overview with the live water model.
Arizona pool climate at a glance
Desert heat opens Phoenix-area pools by early March, but summer monsoon dust storms mean mid-season filter cleanings matter as much as the opening date. In model terms that makes Arizona a long-season state. The spread shows up clearly on the local pages: compare Chandler's pool season with Gilbert's and the difference is measured in weeks, not days. Neighbors in the index run on their own normals too — see Alabama and Arkansas for the adjacent calendars.
Arizona pool season FAQ
When do pools open in Arizona?
Model openings in Arizona run from January 26 in Yuma to June 2 in Flagstaff, with the statewide median on February 25. Each date is two weeks before that city's 7-day mean temperature crosses 61°F — early enough to start up in algae-cold water.
When should you close a pool in Arizona?
The median Arizona closing deadline is November 26, and every city's own deadline is capped a week ahead of its NOAA 50% first-freeze date. Closing late and cold beats closing early and warm — cool water holds its winter chemistry far better.
Which Arizona city has the longest swim season?
Chandler leads with 245 days of 80°F+ highs per year, while Flagstaff brings up the rear at 52 days. The chart above ranks every covered city by the same metric.