Pool closing · State guide
When to Close Your Pool in Indiana
Last updated: July 15, 2026 · 13 cities covered
Closing deadlines across Indiana stretch about 22 days: Elkhart needs the cover on first (October 5), Evansville last (October 27), and the statewide median deadline is October 8.
Each deadline is the model's two-clock compromise — ten days after the water leaves the algae zone, capped a week before the local 50% first-freeze date. City pages carry the live widget that flags early-freeze years and the full winterizing sequence.
| City | Window opens | Close by | First freeze (50%) |
|---|---|---|---|
| Anderson | Sep 30 | Oct 10 | Oct 23 |
| Bloomington | Oct 1 | Oct 11 | Oct 26 |
| Carmel | Sep 28 | Oct 8 | Oct 21 |
| Elkhart | Sep 25 | Oct 5 | Oct 21 |
| Evansville | Oct 17 | Oct 27 | Nov 10 |
| Fishers | Sep 28 | Oct 8 | Oct 21 |
| Fort Wayne | Sep 26 | Oct 6 | Oct 21 |
| Hammond | Sep 26 | Oct 6 | Oct 20 |
| Indianapolis | Sep 28 | Oct 8 | Oct 21 |
| Lafayette | Sep 28 | Oct 8 | Oct 18 |
| Muncie | Oct 2 | Oct 12 | Oct 25 |
| South Bend | Sep 26 | Oct 6 | Oct 23 |
| Terre Haute | Oct 6 | Oct 12 | Oct 19 |
Dates are typical-year model outputs, not forecasts — each city guide carries the live widget that tracks the current year against them.
How to use these dates
Each "close by" deadline is the model's two-clock compromise for that city: ten days after its 7-day mean temperature falls back through 61°F (water goes algae-dormant soon after), but never later than a week before its 50% first-freeze date from the NOAA 1991–2020 normals. Closing inside the window seals cold, stable water under the cover; closing early seals a warm algae incubator instead.
Treat the dates as typical-year guidance, not forecasts. An early cold snap moves the real deadline — each city guide runs a live water-temperature widget that flags a 32°F night inside the 10-day forecast as urgent, and carries the full winterizing checklist in working order.