Pool season · Michigan
Jackson Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Jackson's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Jackson's swim season; the hollow teal run before it (May 2 to May 23) 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 Jackson pool calendar
Opening — target May 9
Open by May 9 — a two-week head start on the May 23 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 30
The window opens September 20 once water leaves the algae zone; the model deadline is September 30, a week ahead of the October 14 freeze normal.
Estimated water temperature by month
This is Jackson'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 26° | 25° | 31° | 43° | 54° | 64° | 71° | 71° | 67° | 57° | 45° | 34° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Jackson hits the closing window
Data: NOAA 1991–2020 climate normals via Jackson Reynolds Field (3.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.