Pool season · Ohio
Columbus Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Columbus pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Columbus, OH — 97 swim days a yearEach dot on the bar is one week of Columbus's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 20–May 11), solid teal is swim season, and hollow amber is the closing window ending October 10. The black marker is today — its position against the colors is the entire executive summary.
The Columbus pool calendar
Opening — target April 27
Target April 27; the practical window runs April 20–May 11, and the 7-day mean crosses the 61°F threshold around May 11. Cold-water starts are the cheap ones.
Closing — deadline October 10
Hold the cover until September 30, then winterize by October 10, a week ahead of the October 24 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Columbus'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30° | 29° | 36° | 48° | 58° | 68° | 74° | 74° | 70° | 61° | 48° | 38° |
The curve peaks near 75°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Cleveland's pool season and Dayton's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Ohio season index.
Columbus pool season FAQ
When should I open my pool in Columbus, OH?
Target April 27. That date backs off two weeks from the day Columbus's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Columbus opening guide.
When should I close my pool in Columbus?
The closing deadline is October 10 — late enough that the water has cooled out of the algae zone, early enough to beat Columbus's first-freeze normal by about a week. See the Columbus closing guide for the winterizing steps.
How long is the swim season in Columbus?
Columbus averages 97 days a year with normal highs of 80°F or better — about 5 days earlier than the Ohio median. The Ohio season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Columbus?
An unheated pool near Columbus typically peaks around 75°F in high summer and bottoms out near 28°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 Columbus hits the closing window
Data: NOAA 1991–2020 climate normals via Columbus Wcmh (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.