Grantsville, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsville, a city in Tooele County, Utah.
Today
89°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 89. North wind 5 to 10 mph.
7-day forecast for Grantsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Patchy Smoke | 5 to 10 mph N | 0% |
| Tonight | 63°F | Areas Of Smoke | 5 to 9 mph W | 0% |
| Wednesday | 92°F | Areas Of Smoke | 5 to 10 mph N | 0% |
| Wednesday Night | 67°F | Patchy Smoke then Mostly Clear | 8 mph ESE | 0% |
| Thursday | 97°F | Sunny | 5 to 10 mph N | 0% |
| Thursday Night | 72°F | Mostly Clear | 6 to 9 mph SE | 0% |
| Friday | 100°F | Sunny | 6 to 9 mph WSW | 0% |
| Friday Night | 74°F | Mostly Clear | 6 to 9 mph SSE | 0% |
| Saturday | 100°F | Sunny | 5 to 9 mph W | 0% |
| Saturday Night | 76°F | Mostly Clear | 5 to 9 mph SSE | 1% |
| Sunday | 100°F | Mostly Sunny | 6 to 9 mph WNW | 5% |
| Sunday Night | 75°F | Partly Cloudy | 8 to 12 mph SE | 6% |
| Monday | 98°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 9 mph NW | 15% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 12 mph SE | 16% |
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 Aug 4, 2026.