Rock Rapids, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Rapids, a city in Lyon County, Iowa.
Overnight
39°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 39, with temperatures rising to around 42 overnight. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rock Rapids
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Chance Rain Showers | 15 mph NW | 41% |
| Wednesday | 46°F | Rain Showers Likely | 15 mph NW | 72% |
| Wednesday Night | 37°F | Chance Rain Showers | 10 to 15 mph NW | 48% |
| Thursday | 46°F | Mostly Cloudy | 10 to 15 mph NNW | 3% |
| Thursday Night | 31°F | Mostly Cloudy | 0 to 10 mph N | 0% |
| Friday | 45°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 28°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph SSW | 1% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 0 to 5 mph WSW | 0% |
| Sunday Night | 36°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 60°F | Sunny | 5 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 58°F | Mostly Sunny | 0 to 5 mph W | 0% |
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 Nov 4, 2026.