Castle Valley, UT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castle Valley, a town in Grand County, Utah.
Overnight
38°F
Patchy Fog
Patchy fog after 5am. Mostly cloudy, with a low around 38. East southeast wind 0 to 5 mph.
7-day forecast for Castle Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 38°F | Patchy Fog | 0 to 5 mph ESE | 3% |
| Wednesday | 52°F | Chance Showers And Thunderstorms | 0 to 5 mph NNW | 48% |
| Wednesday Night | 35°F | Patchy Fog | 0 to 5 mph SE | 10% |
| Thursday | 53°F | Patchy Fog then Mostly Sunny | 0 to 5 mph N | 1% |
| Thursday Night | 37°F | Mostly Cloudy | 0 mph | 4% |
| Friday | 55°F | Sunny | 0 to 5 mph NNE | 4% |
| Friday Night | 36°F | Mostly Clear | 0 mph | 0% |
| Saturday | 56°F | Sunny | 0 to 5 mph NNE | 0% |
| Saturday Night | 38°F | Mostly Clear | 0 mph | 0% |
| Sunday | 58°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 39°F | Mostly Clear | 0 mph | 0% |
| Monday | 58°F | Mostly Sunny | 0 mph | 0% |
| Monday Night | 40°F | Partly Cloudy | 0 mph | 0% |
| Tuesday | 59°F | Mostly Sunny | 0 to 5 mph W | 1% |
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 Nov 4, 2026.