Grantsville, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsville, a city in Tooele County, Utah.
Tonight
39°F
Mostly Cloudy then Slight Chance Light Rain
A slight chance of rain after 5am. Mostly cloudy, with a low around 39. West southwest wind around 3 mph. Chance of precipitation is 20%.
7-day forecast for Grantsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Mostly Cloudy then Slight Chance Light Rain | 3 mph WSW | 16% |
| Wednesday | 49°F | Chance Light Rain | 2 to 7 mph W | 34% |
| Wednesday Night | 36°F | Chance Light Rain then Partly Cloudy | 3 to 7 mph S | 34% |
| Thursday | 51°F | Mostly Sunny | 5 mph W | 4% |
| Thursday Night | 36°F | Patchy Fog | 3 mph SSW | 4% |
| Friday | 52°F | Patchy Fog then Sunny | 1 to 6 mph N | 1% |
| Friday Night | 36°F | Partly Cloudy | 3 mph SSE | 0% |
| Saturday | 54°F | Sunny | 1 to 5 mph NNE | 0% |
| Saturday Night | 38°F | Mostly Clear | 3 mph SE | 0% |
| Sunday | 59°F | Sunny | 1 to 5 mph E | 0% |
| Sunday Night | 43°F | Partly Cloudy | 2 mph E | 0% |
| Monday | 59°F | Mostly Sunny | 1 to 6 mph NE | 0% |
| Monday Night | 44°F | Mostly Cloudy | 1 mph N | 3% |
| Tuesday | 59°F | Partly Sunny | 1 to 5 mph NNW | 5% |
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 Nov 4, 2026.