Pool season · State index
Arizona Pool Season Calendar
Last updated: July 15, 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.
| 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.