Rock Valley, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Valley, a city in Sioux County, Iowa.
Today
68°F
Cloudy
Cloudy, with a high near 68. North wind 5 to 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rock Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Cloudy | 5 to 10 mph N | 11% |
| Tonight | 56°F | Cloudy | 10 mph NNE | 7% |
| Sunday | 66°F | Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Sunday Night | 52°F | Rain Showers Likely | 5 to 10 mph ENE | 55% |
| Monday | 60°F | Showers And Thunderstorms Likely | 5 to 10 mph ENE | 55% |
| Monday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 5 mph E | 29% |
| Tuesday | 62°F | Mostly Sunny | 5 mph ESE | 4% |
| Tuesday Night | 44°F | Partly Cloudy | 5 mph ESE | 2% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph SE | 6% |
| Wednesday Night | 50°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 28% |
| Thursday | 68°F | Chance Rain Showers | 5 to 10 mph SE | 28% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 15% |
| Friday | 70°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph SE | 15% |
| Friday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 23% |
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 19, 2026.