Pool season · Maryland
Silver Spring Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Silver Spring 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.
Silver Spring, MD — 101 swim days a yearEach dot on the bar is one week of Silver Spring'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 Silver Spring 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 November 1 freeze normal.
Estimated water temperature by month
This is Silver Spring'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 35° | 35° | 40° | 50° | 60° | 69° | 76° | 77° | 73° | 63° | 51° | 42° |
The curve peaks near 77°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Salisbury's pool season and Waldorf's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Maryland season index.
Silver Spring pool season FAQ
When should I open my pool in Silver Spring, MD?
Open by April 22 — the model places Silver Spring's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Silver Spring opening guide has the 12-step sequence.
When should I close my pool in Silver Spring?
Close by October 16: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Silver Spring closing guide sequences the work backward from that date.
How long is the swim season in Silver Spring?
Silver Spring averages 101 days a year with normal highs of 80°F or better — right on the statewide median. The Maryland season index ranks all 9 covered cities by the same metric.
How warm does pool water get in Silver Spring?
An unheated pool near Silver Spring typically peaks around 77°F in high summer and bottoms out near 34°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 Silver Spring hits the closing window
Data: NOAA 1991–2020 climate normals via Beltsville (5.2 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.