Pool season · Michigan
Flint Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Flint'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.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Flint's swim season; the hollow teal run before it (May 6 to May 27) is when to open; the hollow amber run after is when to close, with September 28 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Flint pool calendar
Opening — target May 13
Target May 13; the practical window runs May 6–May 27, and the 7-day mean crosses the 61°F threshold around May 27. Cold-water starts are the cheap ones.
Closing — deadline September 28
Hold the cover until September 18, then winterize by September 28, a week ahead of the October 13 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Flint'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25° | 23° | 29° | 40° | 52° | 63° | 70° | 70° | 66° | 56° | 44° | 33° |
The curve peaks near 71°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Flint hits the closing window
Data: NOAA 1991–2020 climate normals via Flint 7w (4.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.