Rock Valley, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Valley, a city in Sioux County, Iowa.
This Afternoon
66°F
Mostly Cloudy
Mostly cloudy, with a high near 66. North northeast wind around 10 mph.
7-day forecast for Rock Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Cloudy | 10 mph NNE | 9% |
| Tonight | 56°F | Cloudy | 10 mph NNE | 7% |
| Sunday | 65°F | Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 16% |
| Sunday Night | 52°F | Rain Showers | 5 to 10 mph NE | 94% |
| Monday | 57°F | Rain Showers | 5 to 10 mph ENE | 94% |
| Monday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph NE | 16% |
| Tuesday | 63°F | Partly Sunny | 5 mph E | 3% |
| Tuesday Night | 44°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph SE | 6% |
| Wednesday Night | 51°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph SE | 49% |
| Thursday | 68°F | Chance Showers And Thunderstorms | 10 mph SSE | 49% |
| Thursday Night | 55°F | Mostly Cloudy | 5 mph SE | 14% |
| Friday | 72°F | Mostly Cloudy | 5 to 10 mph SE | 13% |
| Friday Night | 57°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SE | 30% |
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 Sep 20, 2026.