Grantsville, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsville, a city in Tooele County, Utah.
This Afternoon
74°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 74, with temperatures falling to around 71 in the afternoon. Southwest wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Grantsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Chance Showers And Thunderstorms | 9 mph SW | 74% |
| Tonight | 51°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 3 to 7 mph NW | 56% |
| Saturday | 68°F | Sunny | 3 to 8 mph N | 4% |
| Saturday Night | 51°F | Partly Cloudy | 3 to 7 mph ESE | 0% |
| Sunday | 70°F | Sunny | 3 to 9 mph E | 0% |
| Sunday Night | 52°F | Partly Cloudy | 3 to 7 mph ESE | 0% |
| Monday | 75°F | Mostly Sunny | 3 to 7 mph NE | 0% |
| Monday Night | 58°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 6 mph SE | 12% |
| Tuesday | 75°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 6 mph W | 19% |
| Tuesday Night | 56°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph SSE | 19% |
| Wednesday | 77°F | Sunny | 3 to 7 mph SSE | 7% |
| Wednesday Night | 57°F | Mostly Clear | 6 mph SE | 2% |
| Thursday | 79°F | Sunny | 7 mph E | 3% |
| Thursday Night | 60°F | Partly Cloudy | 5 to 8 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Grantsville (40.611, -112.469). Updated through the day.
Growing snapshot for Grantsville
Last spring frost
May 2
First fall frost
Oct 16
Growing season
165 days
Hardiness zone
7a
More local growing data for Grantsville: nearby ZIP 84074 weather · frost dates · planting calendar · Utah frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Tooele, Ut (3.4 mi from Grantsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.