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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

WhenTempForecastWindPrecip
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

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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.