Pool season · Minnesota
Bloomington Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Bloomington'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.
The bar compresses Bloomington's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 29–May 20 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 2. Wherever the today marker sits, the nearest color change is your next appointment.
The Bloomington pool calendar
Opening — target May 6
Target May 6; the practical window runs April 29–May 20, and the 7-day mean crosses the 61°F threshold around May 20. Cold-water starts are the cheap ones.
Closing — deadline October 2
Hold the cover until September 22, then winterize by October 2, a week ahead of the October 18 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Bloomington'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 18° | 17° | 27° | 41° | 54° | 66° | 73° | 73° | 68° | 57° | 42° | 28° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Bloomington hits the closing window
Data: NOAA 1991–2020 climate normals via Minneapolis/st Paul Airport (5.6 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.