Pool season · California
Roseville Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
This is the one-page view of Roseville'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.
Roseville, CA — 155 swim days a yearThe bar compresses Roseville's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 4–April 25 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends November 2. Wherever the today marker sits, the nearest color change is your next appointment.
The Roseville pool calendar
Opening — target April 11
Open by April 11 — a two-week head start on the April 25 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline November 2
The window opens October 23 once water leaves the algae zone; the model deadline is November 2, a week ahead of the November 24 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Roseville'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 46° | 48° | 53° | 56° | 63° | 70° | 75° | 76° | 74° | 68° | 58° | 48° |
The curve peaks near 76°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Rocklin's pool season and Sacramento's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Roseville pool season FAQ
When should I open my pool in Roseville, CA?
Open by April 11 — the model places Roseville's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Roseville opening guide has the 12-step sequence.
When should I close my pool in Roseville?
Close by November 2: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Roseville closing guide sequences the work backward from that date.
How long is the swim season in Roseville?
Roseville averages 155 days a year with normal highs of 80°F or better — about 10 days later than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Roseville?
An unheated pool near Roseville typically peaks around 76°F in high summer and bottoms out near 46°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 Roseville hits the closing window
Data: NOAA 1991–2020 climate normals via Sacramento Metro Airport (15.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.