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
61°F
Chance Rain Showers
A chance of rain showers and patchy smoke. Mostly cloudy, with a low around 61. North wind around 15 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Rock Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Chance Rain Showers | 15 mph N | 51% |
| Tuesday | 72°F | Chance Rain Showers | 5 to 10 mph NNW | 43% |
| Tuesday Night | 53°F | Chance Rain Showers then Mostly Cloudy | 0 mph | 28% |
| Wednesday | 76°F | Mostly Sunny | 0 mph | 1% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 5 mph S | 0% |
| Thursday | 81°F | Sunny | 5 to 10 mph S | 0% |
| Thursday Night | 62°F | Mostly Clear | 5 to 10 mph S | 2% |
| Friday | 86°F | Sunny | 5 to 10 mph S | 5% |
| Friday Night | 65°F | Mostly Clear | 5 to 10 mph S | 13% |
| Saturday | 89°F | Sunny | 5 to 15 mph S | 5% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SE | 23% |
| Sunday | 87°F | Mostly Sunny | 10 mph SE | 13% |
| Sunday Night | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph E | 22% |
| Monday | 86°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph E | 22% |
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 Aug 4, 2026.