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
52°F
Chance Showers And Thunderstorms
A chance of rain showers before 11am, then a chance of showers and thunderstorms between 11am and 5pm. Partly sunny, with a high near 52. Northwest wind 0 to 5 mph. Chance of precipitation is 50%.
7-day forecast for Castle Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 48% |
| Tonight | 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% |
| Tuesday Night | 40°F | Partly Cloudy | 0 mph | 2% |
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.