Pool season · Indiana
Anderson Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Anderson'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 Anderson's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 20–May 11 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 10. Wherever the today marker sits, the nearest color change is your next appointment.
The Anderson pool calendar
Opening — target April 27
Open by April 27 — a two-week head start on the May 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 10
Hold the cover until September 30, then winterize by October 10, a week ahead of the October 23 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Anderson'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29° | 29° | 37° | 48° | 58° | 68° | 74° | 74° | 70° | 61° | 48° | 37° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Anderson hits the closing window
Data: NOAA 1991–2020 climate normals via Anderson Sewage Plt (2.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.