Pool season · Indiana
Indianapolis Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Indianapolis'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.
The bar compresses Indianapolis's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 21–May 12 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 8. Wherever the today marker sits, the nearest color change is your next appointment.
The Indianapolis pool calendar
Opening — target April 28
Open by April 28 — a two-week head start on the May 12 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 8
The window opens September 28 once water leaves the algae zone; the model deadline is October 8, a week ahead of the October 21 freeze normal.
Estimated water temperature by month
This is Indianapolis'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 28° | 28° | 36° | 46° | 58° | 68° | 74° | 74° | 70° | 60° | 47° | 36° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Indianapolis hits the closing window
Data: NOAA 1991–2020 climate normals via Indianapolis SE Side (5.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.