Pool season · State index
Louisiana Pool Season Calendar
Last updated: July 15, 2026 · 13 cities covered
Both halves of the pool year for all 13 covered Louisiana cities. The median calendar runs March 3 to November 19. 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 |
|---|---|---|---|
| Alexandria | Mar 10 | Nov 13 | 163 |
| Baton Rouge | Mar 5 | Nov 16 | 173 |
| Hammond | Mar 7 | Nov 12 | 175 |
| Houma | Feb 17 | Nov 28 | 181 |
| Kenner | Feb 16 | Nov 30 | 179 |
| Lafayette | Feb 28 | Nov 20 | 179 |
| Lake Charles | Feb 20 | Nov 26 | 184 |
| Mandeville | Mar 4 | Nov 11 | 171 |
| Metairie | Feb 16 | Nov 30 | 179 |
| Monroe | Mar 14 | Nov 8 | 167 |
| New Orleans | Feb 15 | Dec 2 | 171 |
| Shreveport | Mar 10 | Nov 11 | 170 |
| Slidell | Mar 3 | Nov 19 | 164 |
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 Louisiana 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.