Pool season · Colorado
Lakewood Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Lakewood'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.
Lakewood, CO — 82 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Lakewood's swim season; the hollow teal run before it (May 9 to May 30) is when to open; the hollow amber run after is when to close, with September 29 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Lakewood pool calendar
Opening — target May 16
Target May 16; the practical window runs May 9–May 30, and the 7-day mean crosses the 61°F threshold around May 30. Cold-water starts are the cheap ones.
Closing — deadline September 29
Hold the cover until September 19, then winterize by September 29, a week ahead of the October 7 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Lakewood'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32° | 33° | 37° | 45° | 51° | 62° | 71° | 72° | 67° | 56° | 45° | 35° |
The curve peaks near 73°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Lafayette's pool season and Longmont's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Colorado season index.
Lakewood pool season FAQ
When should I open my pool in Lakewood, CO?
The site model recommends opening by May 16 — about two weeks before Lakewood'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 Lakewood opening guide.
When should I close my pool in Lakewood?
Winterize by September 29. The model holds the deadline a week ahead of Lakewood's NOAA 50% first-freeze date, so the plumbing is protected before the first hard night. The full sequence is in the Lakewood closing guide.
How long is the swim season in Lakewood?
Lakewood averages 82 days a year with normal highs of 80°F or better — right on the statewide median. The Colorado season index ranks all 19 covered cities by the same metric.
How warm does pool water get in Lakewood?
An unheated pool near Lakewood typically peaks around 73°F in high summer and bottoms out near 32°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 Lakewood hits the closing window
Data: NOAA 1991–2020 climate normals via Lakewood (3.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.