Pool season · California
Carson Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Carson'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.
Carson, CA — 0 swim days a yearEach dot on the bar is one week of Carson's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 28–April 18), solid teal is swim season, and hollow amber is the closing window ending November 24. The black marker is today — its position against the colors is the entire executive summary.
The Carson pool calendar
Opening — target April 4
Target April 4; the practical window runs March 28–April 18, and the 7-day mean crosses the 61°F threshold around April 18. Cold-water starts are the cheap ones.
Closing — deadline November 24
The window opens November 14 once water leaves the algae zone; the model deadline is November 24, a week ahead of the January 5 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Carson'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 56° | 57° | 58° | 60° | 62° | 65° | 68° | 70° | 70° | 68° | 64° | 58° |
The curve peaks near 70°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Carmichael's pool season and Castro Valley's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Carson pool season FAQ
When should I open my pool in Carson, CA?
Open by April 4 — the model places Carson's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Carson opening guide has the 12-step sequence.
When should I close my pool in Carson?
Close by November 24: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Carson closing guide sequences the work backward from that date.
How long is the swim season in Carson?
Carson averages 0 days a year with normal highs of 80°F or better — right on the statewide median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Carson?
An unheated pool near Carson typically peaks around 70°F in high summer and bottoms out near 56°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 Carson hits the closing window
Data: NOAA 1991–2020 climate normals via Torrance Airport (5.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.