Minnesota Pool Season: Opening & Closing Dates by City

Local dates for every featured Minnesota city — when the water warms up, when it cools off, and how long the season actually lasts.

City Opening window Closing window Season
Minneapolis May 25 – Jun 13 Aug 27 – Sep 17 ≈ 95 days
Duluth Jun 30 – Jul 11 Aug 23 – Sep 2 ≈ 43 days
Rochester May 29 – Jun 20 Aug 16 – Sep 11 ≈ 83 days

Windows show the stretch when each city's daily average passes through the low-to-mid 60s°F (1991–2020 NOAA records, nearest station to each city). Click a city for its month-by-month table and full season notes.

Season geography

Across Minnesota's featured cities, typical openings spread from Jun 4 to Jul 11, closings from Aug 23 to Sep 7, and the unheated season runs 43–95 days depending on where you are. Elevation, coastal water, and urban heat all pull real dates around, which is exactly why a state-level answer isn't enough.

For your exact town, the pool season lookup takes a ZIP code. Opening day itself is a chemistry job — the dosing calculator turns your first test reading of the year into exact amounts.

Minnesota planning pages

When to open — Minnesota When to close — Minnesota All states →