Pool season · Michigan
Lansing Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Lansing'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 Lansing's swim season; the hollow teal run before it (May 3 to May 24) is when to open; the hollow amber run after is when to close, with September 30 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Lansing pool calendar
Opening — target May 10
Target May 10; the practical window runs May 3–May 24, and the 7-day mean crosses the 61°F threshold around May 24. Cold-water starts are the cheap ones.
Closing — deadline September 30
Hold the cover until September 20, then winterize by September 30, a week ahead of the October 13 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Lansing'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 26° | 24° | 31° | 42° | 53° | 64° | 71° | 71° | 67° | 56° | 45° | 34° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Lansing hits the closing window
Data: NOAA 1991–2020 climate normals via Lansing Capital City Airport (4.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.