Pool season · State index
Vermont Pool Season 2026: Opening & Closing Dates by City
Last updated: July 25, 2026 · 1 cities covered
Both halves of the pool year for all 1 covered Vermont cities. The median calendar runs May 10 to September 30. Every row links to a one-page season overview with the live water-temperature model; the opening and closing hubs carry the full checklists.
Vermont: a short-season pool state| City | Open by | Close by | 80°F+ days |
|---|---|---|---|
| Burlington | May 10 | Sep 30 | 60 |
What the columns mean
"Open by" is the recommended spring date — two weeks before the city's 7-day mean temperature crosses 61°F, the model's proxy for water approaching the 65°F algae-growth zone. "Close by" is the fall deadline — ten days after the water leaves that zone, capped a week ahead of the local 50% first-freeze date. "80°F+ days" counts days whose normal high reaches 80°F: the length of the true warm-swim season, and the fairest single number for comparing Vermont cities against each other.
Every figure comes from each city's own NOAA 1991–2020 normals station (named in its guide's footer), so neighboring cities can legitimately differ by a few days. The season overview linked from each row adds the live water-temperature model and the full-year season bar; the state hubs above carry the step-by-step checklists.
Swim-season length across Vermont
The fairest way to compare Vermont cities is the number of days with 80°F+ normal highs — the practical warm-swim season. Every bar links to that city's one-page season overview with the live water model.
Vermont pool climate at a glance
Long snowy winters and cool Green Mountain nights hold Vermont to a brief midsummer season, with many pools not comfortably warm until July. In model terms that makes Vermont a short-season state. The spread shows up clearly on the local pages: compare Burlington's pool season and the difference is measured in weeks, not days. Neighbors in the index run on their own normals too — see Utah and Virginia for the adjacent calendars.
Vermont pool season FAQ
When do pools open in Vermont?
Model openings in Vermont run from May 10 in Burlington to May 10 in Burlington, with the statewide median on May 10. Each date is two weeks before that city's 7-day mean temperature crosses 61°F — early enough to start up in algae-cold water.
When should you close a pool in Vermont?
The median Vermont closing deadline is September 30, and every city's own deadline is capped a week ahead of its NOAA 50% first-freeze date. Closing late and cold beats closing early and warm — cool water holds its winter chemistry far better.
Which Vermont city has the longest swim season?
Burlington leads with 60 days of 80°F+ highs per year. The chart above ranks every covered city by the same metric.