Pool season · Kansas
Lawrence Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
This is the one-page view of Lawrence'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.
Each dot on the bar is one week of Lawrence's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 15–May 6), solid teal is swim season, and hollow amber is the closing window ending October 16. The black marker is today — its position against the colors is the entire executive summary.
The Lawrence pool calendar
Opening — target April 22
Target April 22; the practical window runs April 15–May 6, and the 7-day mean crosses the 61°F threshold around May 6. Cold-water starts are the cheap ones.
Closing — deadline October 16
The window opens October 6 once water leaves the algae zone; the model deadline is October 16, a week ahead of the October 28 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Lawrence'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30° | 30° | 39° | 50° | 60° | 71° | 78° | 79° | 73° | 63° | 50° | 38° |
Warmest water typically July–August (peaking near 80°F); heaters and covers shift any month up.
Email me when Lawrence hits the closing window
Data: NOAA 1991–2020 climate normals via Lawrence (0.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.