Pool season · Texas
Allen Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Allen's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
Each dot on the bar is one week of Allen'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 13–April 3), solid teal is swim season, and hollow amber is the closing window ending November 4. The black marker is today — its position against the colors is the entire executive summary.
The Allen pool calendar
Opening — target March 20
Open by March 20 — a two-week head start on the April 3 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 4
The window opens October 29 once water leaves the algae zone; the model deadline is November 4, a week ahead of the November 11 freeze normal.
Estimated water temperature by month
This is Allen's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 45° | 46° | 53° | 61° | 68° | 78° | 83° | 85° | 81° | 72° | 60° | 50° |
Warmest water typically June–September (peaking near 85°F); heaters and covers shift any month up.
Email me when Allen hits the closing window
Data: NOAA 1991–2020 climate normals via Mckinney Municipal Airport (6.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.