Pool season · Michigan
Troy Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Troy'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.
The bar compresses Troy's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 30–May 21 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 3. Wherever the today marker sits, the nearest color change is your next appointment.
The Troy pool calendar
Opening — target May 7
Target May 7; the practical window runs April 30–May 21, and the 7-day mean crosses the 61°F threshold around May 21. Cold-water starts are the cheap ones.
Closing — deadline October 3
Hold the cover until September 23, then winterize by October 3, a week ahead of the October 22 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Troy'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 27° | 24° | 31° | 42° | 54° | 65° | 71° | 72° | 68° | 58° | 45° | 35° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Troy hits the closing window
Data: NOAA 1991–2020 climate normals via Pontiac Wwtp (6.8 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.