Pool season · Connecticut
Danbury Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Danbury'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.
Danbury, CT — 58 swim days a yearThe bar compresses Danbury's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the May 6–May 27 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 1. Wherever the today marker sits, the nearest color change is your next appointment.
The Danbury pool calendar
Opening — target May 13
Open by May 13 — a two-week head start on the May 27 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 1
Hold the cover until September 21, then winterize by October 1, a week ahead of the October 14 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Danbury'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29° | 27° | 33° | 43° | 53° | 63° | 70° | 72° | 67° | 57° | 46° | 36° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Bridgeport's pool season and Hartford's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Connecticut season index.
Danbury pool season FAQ
When should I open my pool in Danbury, CT?
Target May 13. That date backs off two weeks from the day Danbury's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Danbury opening guide.
When should I close my pool in Danbury?
The closing deadline is October 1 — late enough that the water has cooled out of the algae zone, early enough to beat Danbury's first-freeze normal by about a week. See the Danbury closing guide for the winterizing steps.
How long is the swim season in Danbury?
Danbury averages 58 days a year with normal highs of 80°F or better — about 5 days later than the Connecticut median. The Connecticut season index ranks all 8 covered cities by the same metric.
How warm does pool water get in Danbury?
An unheated pool near Danbury typically peaks around 72°F in high summer and bottoms out near 27°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Danbury hits the closing window
Data: NOAA 1991–2020 climate normals via Danbury Municipal Airport (2.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.