Pool season · Colorado
Pueblo Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Pueblo's pool year: both model windows, the estimated water-temperature curve, and today's live position on the season bar. The detailed checklists live on the opening and closing guides; this page is the calendar you check between them.
Pueblo, CO — 125 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Pueblo's swim season; the hollow teal run before it (April 25 to May 16) is when to open; the hollow amber run after is when to close, with October 2 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Pueblo pool calendar
Opening — target May 2
Target May 2; the practical window runs April 25–May 16, and the 7-day mean crosses the 61°F threshold around May 16. Cold-water starts are the cheap ones.
Closing — deadline October 2
Hold the cover until September 29, then winterize by October 2, a week ahead of the October 9 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Pueblo'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° | 33° | 39° | 49° | 56° | 68° | 75° | 77° | 71° | 60° | 46° | 34° |
The curve peaks near 78°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Loveland's pool season and Thornton's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Colorado season index.
Pueblo pool season FAQ
When should I open my pool in Pueblo, CO?
The site model recommends opening by May 2 — about two weeks before Pueblo's 7-day mean temperature crosses 61°F, while the water is still too cold for algae. The step-by-step sequence is in the Pueblo opening guide.
When should I close my pool in Pueblo?
Winterize by October 2. The model holds the deadline a week ahead of Pueblo's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Pueblo closing guide.
How long is the swim season in Pueblo?
Pueblo averages 125 days a year with normal highs of 80°F or better — about 11 days earlier than the Colorado median. The Colorado season index ranks all 19 covered cities by the same metric.
How warm does pool water get in Pueblo?
An unheated pool near Pueblo typically peaks around 78°F in high summer and bottoms out near 30°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 Pueblo hits the closing window
Data: NOAA 1991–2020 climate normals via Wfo Pueblo (4.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.