Pool season · Indiana
Terre Haute Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Terre Haute pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Each dot on the bar is one week of Terre Haute's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 8–April 29), solid teal is swim season, and hollow amber is the closing window ending October 12. The black marker is today — its position against the colors is the entire executive summary.
The Terre Haute pool calendar
Opening — target April 15
Open by April 15 — a two-week head start on the April 29 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 12
The window opens October 6 once water leaves the algae zone; the model deadline is October 12, a week ahead of the October 19 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Terre Haute'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 31° | 39° | 51° | 62° | 71° | 78° | 78° | 74° | 63° | 50° | 39° |
Warmest water typically July–August (peaking near 78°F); heaters and covers shift any month up.
Email me when Terre Haute hits the closing window
Data: NOAA 1991–2020 climate normals via Terre Haute Indiana State (1.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.