Union Bridge, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union Bridge, a town in Frederick County, Maryland.
This Afternoon
77°F
Mostly Cloudy
Mostly cloudy, with a high near 77. East wind around 3 mph.
7-day forecast for Union Bridge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Cloudy | 3 mph E | 8% |
| Tonight | 63°F | Mostly Cloudy then Chance Rain Showers | 3 to 8 mph SE | 30% |
| Sunday | 81°F | Showers And Thunderstorms Likely | 6 to 10 mph S | 60% |
| Sunday Night | 57°F | Showers And Thunderstorms | 2 to 12 mph W | 75% |
| Monday | 68°F | Chance Rain Showers | 6 to 12 mph N | 35% |
| Monday Night | 52°F | Chance Rain Showers | 3 to 8 mph NE | 46% |
| Tuesday | 61°F | Rain Showers Likely | 9 mph NE | 62% |
| Tuesday Night | 49°F | Rain Showers Likely | 8 to 12 mph NE | 58% |
| Wednesday | 59°F | Chance Rain Showers | 12 mph NE | 45% |
| Wednesday Night | 50°F | Chance Rain Showers | 10 mph NE | 45% |
| Thursday | 61°F | Chance Rain Showers | 10 mph NE | 45% |
| Thursday Night | 49°F | Chance Rain Showers | 3 to 8 mph N | 37% |
| Friday | 65°F | Slight Chance Rain Showers | 8 mph N | 21% |
| Friday Night | 48°F | Slight Chance Rain Showers | 3 to 8 mph N | 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 Sep 19, 2026.