Rock Valley, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Valley, a city in Sioux County, Iowa.
Overnight
40°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 40, with temperatures rising to around 43 overnight. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rock Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 40°F | Chance Rain Showers | 15 mph NW | 46% |
| Wednesday | 46°F | Rain Showers Likely | 15 mph WNW | 63% |
| Wednesday Night | 39°F | Chance Rain Showers | 10 to 15 mph NW | 45% |
| Thursday | 47°F | Mostly Cloudy | 10 mph NNW | 4% |
| Thursday Night | 32°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Friday | 46°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 29°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph SSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph WSW | 0% |
| Sunday | 56°F | Sunny | 0 to 5 mph WSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 61°F | Sunny | 5 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 58°F | Mostly Sunny | 0 to 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Rock Valley (43.203, -96.289). Updated through the day.
Growing snapshot for Rock Valley
Last spring frost
Apr 30
First fall frost
Oct 3
Growing season
154 days
Hardiness zone
5a
More local growing data for Rock Valley: nearby ZIP 51247 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Alton
Boyden
Chatsworth
Craig
Hawarden
Hospers
Hull
Ireton
Matlock
Maurice
Orange City
Sheldon
Sioux Center
Struble
Climate data from the nearest NOAA station, Sioux Ctr 2 Se, Ia (13.4 mi from Rock Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.