Pool season · Colorado
Arvada Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Arvada'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.
Arvada, CO — 99 swim days a yearThe bar compresses Arvada's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the May 7–May 28 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends September 28. Wherever the today marker sits, the nearest color change is your next appointment.
The Arvada pool calendar
Opening — target May 14
Open by May 14 — a two-week head start on the May 28 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 28
The window opens September 18 once water leaves the algae zone; the model deadline is September 28, a week ahead of the October 5 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Arvada'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 32° | 32° | 37° | 45° | 52° | 63° | 71° | 72° | 67° | 56° | 44° | 34° |
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 Westminster's pool season and Aurora's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Colorado season index.
Arvada pool season FAQ
When should I open my pool in Arvada, CO?
Target May 14. That date backs off two weeks from the day Arvada's 7-day mean temperature reaches 61°F, so you start up in cold, algae-resistant water. Work the full checklist in the Arvada opening guide.
When should I close my pool in Arvada?
The closing deadline is September 28 — late enough that the water has cooled out of the algae zone, early enough to beat Arvada's first-freeze normal by about a week. See the Arvada closing guide for the winterizing steps.
How long is the swim season in Arvada?
Arvada averages 99 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 Arvada?
An unheated pool near Arvada typically peaks around 73°F in high summer and bottoms out near 31°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 Arvada hits the closing window
Data: NOAA 1991–2020 climate normals via Wheat Ridge 2 (4.3 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.