Pool season · Idaho
Coeur d'Alene Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Coeur d'Alene'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.
Coeur d'Alene, ID — 53 swim days a yearEach dot on the bar is one week of Coeur d'Alene's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (May 25–June 15), solid teal is swim season, and hollow amber is the closing window ending September 26. The black marker is today — its position against the colors is the entire executive summary.
The Coeur d'Alene pool calendar
Opening — target June 1
Open by June 1 — a two-week head start on the June 15 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 26
The window opens September 16 once water leaves the algae zone; the model deadline is September 26, a week ahead of the October 18 freeze normal.
Estimated water temperature by month
This is Coeur d'Alene'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 32° | 37° | 43° | 51° | 59° | 66° | 71° | 65° | 55° | 42° | 34° |
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 Boise's pool season and Idaho Falls's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Idaho season index.
Coeur d'Alene pool season FAQ
When should I open my pool in Coeur d'Alene, ID?
Open by June 1 — the model places Coeur d'Alene's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Coeur d'Alene opening guide has the 12-step sequence.
When should I close my pool in Coeur d'Alene?
Close by September 26: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Coeur d'Alene closing guide sequences the work backward from that date.
How long is the swim season in Coeur d'Alene?
Coeur d'Alene averages 53 days a year with normal highs of 80°F or better — about 23 days later than the Idaho median. The Idaho season index ranks all 5 covered cities by the same metric.
How warm does pool water get in Coeur d'Alene?
An unheated pool near Coeur d'Alene typically peaks around 72°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 Coeur d'Alene hits the closing window
Data: NOAA 1991–2020 climate normals via Coeur D'alene (1.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.