Pool season · Maryland
Baltimore Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
Baltimore's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
The bar compresses Baltimore's whole pool year into one lane rope: gray floats for the off-season, hollow teal for the April 5–April 26 opening window, solid teal for swim weeks, hollow amber for the closing stretch that ends October 24. Wherever the today marker sits, the nearest color change is your next appointment.
The Baltimore pool calendar
Opening — target April 12
Target April 12; the practical window runs April 5–April 26, and the 7-day mean crosses the 61°F threshold around April 26. Cold-water starts are the cheap ones.
Closing — deadline October 24
Hold the cover until October 14, then winterize by October 24, a week ahead of the November 21 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Baltimore'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 38° | 38° | 43° | 53° | 63° | 72° | 80° | 81° | 76° | 66° | 55° | 45° |
Warmest water typically July–August (peaking near 81°F); heaters and covers shift any month up.
Email me when Baltimore hits the closing window
Data: NOAA 1991–2020 climate normals via Md Sci Center Baltimore (1.7 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.