Rock Rapids, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Rapids, a city in Lyon County, Iowa.
This Afternoon
64°F
Cloudy
Cloudy, with a high near 64. North northeast wind around 10 mph.
7-day forecast for Rock Rapids
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Cloudy | 10 mph NNE | 5% |
| Tonight | 54°F | Cloudy | 5 to 10 mph NNE | 6% |
| Sunday | 67°F | Mostly Cloudy | 10 to 15 mph NE | 9% |
| Sunday Night | 51°F | Rain Showers | 5 to 10 mph ENE | 91% |
| Monday | 58°F | Rain Showers | 5 to 10 mph ENE | 91% |
| Monday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph ENE | 17% |
| Tuesday | 64°F | Partly Sunny | 0 to 5 mph E | 2% |
| Tuesday Night | 44°F | Mostly Clear | 5 mph ESE | 1% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph SE | 5% |
| Wednesday Night | 50°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph SE | 46% |
| Thursday | 69°F | Chance Showers And Thunderstorms | 10 mph SSE | 46% |
| Thursday Night | 54°F | Mostly Cloudy | 5 mph SE | 13% |
| Friday | 73°F | Mostly Cloudy | 5 to 10 mph SE | 10% |
| Friday Night | 56°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SE | 29% |
Forecast source: National Weather Service (api.weather.gov) for Rock Rapids (43.427, -96.166). Updated through the day.
Growing snapshot for Rock Rapids
Last spring frost
May 1
First fall frost
Oct 4
Growing season
156 days
Hardiness zone
5a
More local growing data for Rock Rapids: nearby ZIP 51246 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Rock Rapids, Ia (0.2 mi from Rock Rapids). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.