Pool season · Idaho
Idaho Falls Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Idaho Falls'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.
The bar compresses Idaho Falls's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the May 20–June 10 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends September 23. Wherever the today marker sits, the nearest color change is your next appointment.
The Idaho Falls pool calendar
Opening — target May 27
Open by May 27 — a two-week head start on the June 10 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 23
The window opens September 13 once water leaves the algae zone; the model deadline is September 23, a week ahead of the October 1 freeze normal.
Estimated water temperature by month
This is Idaho Falls'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 23° | 25° | 34° | 43° | 51° | 59° | 67° | 71° | 65° | 54° | 40° | 28° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Idaho Falls hits the closing window
Data: NOAA 1991–2020 climate normals via Idaho Falls - Kifi (2.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.