Pool season · Texas
Arlington Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Arlington'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.
Each dot on the bar is one week of Arlington's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 3–March 24), solid teal is swim season, and hollow amber is the closing window ending November 12. The black marker is today — its position against the colors is the entire executive summary.
The Arlington pool calendar
Opening — target March 10
Open by March 10 — a two-week head start on the March 24 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 12
The window opens November 2 once water leaves the algae zone; the model deadline is November 12, a week ahead of the November 21 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Arlington'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 47° | 49° | 55° | 63° | 70° | 79° | 84° | 86° | 82° | 73° | 62° | 52° |
Warmest water typically June–September (peaking near 86°F); heaters and covers shift any month up.
Email me when Arlington hits the closing window
Data: NOAA 1991–2020 climate normals via Arlington Municipal Airport (3.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.