Castle Valley, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castle Valley, a town in Grand County, Utah.
Today
103°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 103. West wind 0 to 10 mph.
7-day forecast for Castle Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 103°F | Patchy Smoke | 0 to 10 mph W | 0% |
| Tonight | 69°F | Patchy Smoke then Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 100°F | Sunny then Patchy Smoke | 0 to 10 mph NW | 0% |
| Wednesday Night | 68°F | Patchy Smoke then Mostly Clear | 0 to 5 mph S | 0% |
| Thursday | 102°F | Sunny | 0 to 10 mph NNW | 0% |
| Thursday Night | 70°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Friday | 103°F | Sunny | 0 to 5 mph N | 0% |
| Friday Night | 72°F | Mostly Clear | 0 to 5 mph S | 0% |
| Saturday | 104°F | Sunny | 0 to 10 mph N | 0% |
| Saturday Night | 74°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 102°F | Sunny | 5 to 10 mph SW | 1% |
| Sunday Night | 74°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph S | 15% |
| Monday | 101°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 10 mph S | 18% |
Forecast source: National Weather Service (api.weather.gov) for Castle Valley (38.632, -109.396). Updated through the day.
Growing snapshot for Castle Valley
Last spring frost
Apr 19
First fall frost
Oct 21
Growing season
184 days
Hardiness zone
7a
More local growing data for Castle Valley: nearby ZIP 84532 weather · frost dates · planting calendar · Utah frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Castle Valley 1Se, Ut (7.3 mi from Castle Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.