Smithfield, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithfield, a city in Cache County, Utah.
This Afternoon
72°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 72, with temperatures falling to around 68 in the afternoon. North wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Smithfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Showers And Thunderstorms | 5 mph N | 85% |
| Tonight | 46°F | Showers And Thunderstorms | 0 to 5 mph ENE | 79% |
| Saturday | 65°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 mph SW | 50% |
| Saturday Night | 43°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph ENE | 25% |
| Sunday | 69°F | Sunny | 3 mph ENE | 0% |
| Sunday Night | 46°F | Mostly Clear | 2 mph E | 0% |
| Monday | 76°F | Sunny | 2 mph ENE | 0% |
| Monday Night | 51°F | Partly Cloudy | 2 mph ENE | 1% |
| Tuesday | 76°F | Mostly Sunny | 2 mph N | 7% |
| Tuesday Night | 51°F | Slight Chance Showers And Thunderstorms | 3 mph SE | 21% |
| Wednesday | 76°F | Sunny | 2 mph S | 7% |
| Wednesday Night | 50°F | Mostly Clear | 3 mph E | 4% |
| Thursday | 79°F | Sunny | 2 mph SSE | 3% |
| Thursday Night | 52°F | Partly Cloudy | 1 to 5 mph ESE | 5% |
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 Sep 19, 2026.