Smithfield, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithfield, a city in Cache County, Utah.
This Afternoon
51°F
Mostly Sunny
Mostly sunny. High near 51, with temperatures falling to around 49 in the afternoon. North wind around 3 mph.
7-day forecast for Smithfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Mostly Sunny | 3 mph N | 0% |
| Tonight | 35°F | Mostly Cloudy | 5 mph ENE | 4% |
| Wednesday | 52°F | Partly Sunny | 3 mph N | 12% |
| Wednesday Night | 32°F | Patchy Fog | 1 mph ESE | 7% |
| Thursday | 50°F | Patchy Fog then Slight Chance Light Rain | 2 mph S | 18% |
| Thursday Night | 32°F | Slight Chance Light Rain then Areas Of Fog | 1 mph NE | 18% |
| Friday | 51°F | Areas Of Fog then Mostly Sunny | 2 mph WNW | 1% |
| Friday Night | 32°F | Partly Cloudy | 2 mph ESE | 1% |
| Saturday | 55°F | Sunny | 1 mph NNW | 0% |
| Saturday Night | 35°F | Mostly Clear | 2 mph NE | 0% |
| Sunday | 59°F | Sunny | 0 to 3 mph S | 0% |
| Sunday Night | 38°F | Partly Cloudy | 2 mph E | 0% |
| Monday | 60°F | Mostly Sunny | 2 mph WSW | 1% |
| Monday Night | 40°F | Partly Cloudy | 1 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Smithfield (41.835, -111.828). Updated through the day.
Growing snapshot for Smithfield
Last spring frost
May 8
First fall frost
Oct 2
Growing season
144 days
Hardiness zone
6a
More local growing data for Smithfield: nearby ZIP 84318 weather · frost dates · planting calendar · Utah frost dates
Nearby towns & communities
Amalga
Avon
Benson
Cache
Clarkston
Cornish
Hyde Park
Hyrum
Lewiston
Logan
Mendon
Millville
Newton
Nibley
North Logan
Paradise
Peter
Providence
Richmond
River Heights
Trenton
Wellsville
Climate data from the nearest NOAA station, Logan Cache Ap, Ut (2.7 mi from Smithfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.