Union Bridge, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union Bridge, a town in Frederick County, Maryland.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 3 mph.
7-day forecast for Union Bridge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 3 mph E | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 0 to 3 mph E | 24% |
| Wednesday | 84°F | Showers And Thunderstorms Likely | 0 to 3 mph SE | 71% |
| Wednesday Night | 71°F | Showers And Thunderstorms Likely | 3 mph S | 65% |
| Thursday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph S | 38% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 0 to 6 mph SW | 38% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 47% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 3 mph W | 47% |
| Saturday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 40% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 2 mph SW | 40% |
| Sunday | 88°F | Mostly Sunny | 0 to 3 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 2 mph W | 14% |
| Monday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 7 mph NW | 16% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Union Bridge (39.571, -77.173). Updated through the day.
Growing snapshot for Union Bridge
Last spring frost
Apr 22
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
7a
More local growing data for Union Bridge: nearby ZIP 21791 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Adamstown
Bagtown
Ballenger Creek
Bartonsville
Braddock Heights
Brunswick
Buckeystown
Burkittsville
Emmitsburg
Frederick
Garretts Mill
Graceham
Green Valley
Jefferson
Lewistown
Libertytown
Linganore
Middletown
Monrovia
Mount Airy
Myersville
New Market
Point of Rocks
Rosemont
Sabillasville
Sandy Hook
Spring Ridge
Thurmont
Urbana
Walkersville
Climate data from the nearest NOAA station, Emmitsburg 2 Se, Md (11.1 mi from Union Bridge). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.