Pool season · California
Lake Forest Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Lake Forest pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Each dot on the bar is one week of Lake Forest's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (February 18–March 11), solid teal is swim season, and hollow amber is the closing window ending December 5. The black marker is today — its position against the colors is the entire executive summary.
The Lake Forest pool calendar
Opening — target February 25
Open by February 25 — a two-week head start on the March 11 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline December 5
Hold the cover until November 25, then winterize by December 5, a week ahead of the December 25 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Lake Forest'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 58° | 59° | 60° | 63° | 66° | 69° | 73° | 76° | 76° | 73° | 68° | 60° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Lake Forest hits the closing window
Data: NOAA 1991–2020 climate normals via Irvine Rch (5.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.