Pool season · California
Bellflower Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Bellflower'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 Bellflower's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the March 9–March 30 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 29. Wherever the today marker sits, the nearest color change is your next appointment.
The Bellflower pool calendar
Opening — target March 16
Target March 16; the practical window runs March 9–March 30, and the 7-day mean crosses the 61°F threshold around March 30. Cold-water starts are the cheap ones.
Closing — deadline November 29
The window opens November 19 once water leaves the algae zone; the model deadline is November 29, a week ahead of the January 2 freeze normal.
Estimated water temperature by month
This is Bellflower'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57° | 57° | 59° | 61° | 64° | 67° | 71° | 74° | 74° | 71° | 65° | 58° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Bellflower hits the closing window
Data: NOAA 1991–2020 climate normals via Long Beach Daugherty Field (5.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.