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
70°F
Sunny
Sunny. High near 70, with temperatures falling to around 64 in the afternoon. Southeast wind around 5 mph.
7-day forecast for Union Bridge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Sunny | 5 mph SE | 3% |
| Tonight | 51°F | Mostly Clear | 3 mph SE | 2% |
| Wednesday | 74°F | Mostly Sunny | 3 to 10 mph S | 2% |
| Wednesday Night | 62°F | Mostly Cloudy then Light Rain Likely | 8 mph S | 68% |
| Thursday | 74°F | Light Rain Likely | 5 to 9 mph S | 74% |
| Thursday Night | 60°F | Light Rain Likely | 0 to 5 mph S | 57% |
| Friday | 69°F | Rain Likely | 2 mph N | 57% |
| Friday Night | 47°F | Chance Light Rain | 2 mph NW | 50% |
| Saturday | 63°F | Mostly Sunny | 3 to 9 mph NW | 13% |
| Saturday Night | 37°F | Partly Cloudy | 2 to 6 mph NW | 13% |
| Sunday | 60°F | Mostly Sunny | 2 to 7 mph W | 6% |
| Sunday Night | 36°F | Partly Cloudy then Slight Chance Light Rain | 5 mph W | 21% |
| Monday | 60°F | Slight Chance Light Rain | 5 to 13 mph W | 21% |
| Monday Night | 35°F | Slight Chance Light Rain | 2 to 6 mph W | 21% |
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
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Burkittsville
Emmitsburg
Frederick
Garretts Mill
Graceham
Green Valley
Jefferson
Lewistown
Libertytown
Linganore
Middletown
Monrovia
Mount Airy
Myersville
New Market
Point of Rocks
Rosemont
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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 Nov 4, 2026.