Plymouth, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a town in Box Elder County, Utah.
Today
90°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 90. Northwest wind 6 to 9 mph.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Patchy Smoke | 6 to 9 mph NW | 0% |
| Tonight | 54°F | Areas Of Smoke | 3 to 9 mph NNW | 0% |
| Wednesday | 93°F | Areas Of Smoke | 2 to 9 mph NW | 0% |
| Wednesday Night | 57°F | Areas Of Smoke then Mostly Clear | 2 to 8 mph WNW | 0% |
| Thursday | 98°F | Sunny | 2 to 9 mph NNW | 0% |
| Thursday Night | 63°F | Clear | 2 to 7 mph ESE | 0% |
| Friday | 100°F | Sunny | 1 to 9 mph SE | 0% |
| Friday Night | 66°F | Mostly Clear | 3 to 9 mph NW | 0% |
| Saturday | 100°F | Sunny | 2 to 9 mph NNW | 0% |
| Saturday Night | 68°F | Mostly Clear | 2 to 10 mph NNW | 0% |
| Sunday | 99°F | Mostly Sunny | 2 to 12 mph S | 2% |
| Sunday Night | 66°F | Mostly Clear | 5 to 10 mph NW | 1% |
| Monday | 97°F | Mostly Sunny | 2 to 13 mph S | 2% |
| Monday Night | 65°F | Partly Cloudy | 5 to 12 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Plymouth (41.874, -112.147). Updated through the day.
Growing snapshot for Plymouth
Last spring frost
May 3
First fall frost
Oct 12
Growing season
160 days
Hardiness zone
6a
More local growing data for Plymouth: nearby ZIP 84330 weather · frost dates · planting calendar · Utah frost dates
Nearby towns & communities
Bear River City
Brigham City
Corinne
Deweyville
Elwood
Fielding
Garland
Honeyville
Howell
Mantua
Perry
Portage
Riverside
Snowville
Thatcher
Tremonton
Climate data from the nearest NOAA station, Cutler Dam, Ut (7.7 mi from Plymouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.