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
60°F
Areas Of Fog
Areas of fog before 5am, then areas of fog and a slight chance of showers and thunderstorms. Cloudy. Low around 60, with temperatures rising to around 64 overnight. North northeast wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rock Rapids
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Areas Of Fog | 5 mph NNE | 15% |
| Saturday | 67°F | Patchy Fog then Cloudy | 5 to 10 mph N | 24% |
| Saturday Night | 55°F | Cloudy | 10 mph NNE | 7% |
| Sunday | 67°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| Sunday Night | 51°F | Chance Rain Showers | 5 to 10 mph ENE | 41% |
| Monday | 61°F | Chance Rain Showers | 5 to 10 mph ENE | 49% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 0 to 5 mph ENE | 25% |
| Tuesday | 63°F | Mostly Cloudy | 0 to 5 mph E | 4% |
| Tuesday Night | 46°F | Partly Cloudy | 0 to 5 mph SE | 0% |
| Wednesday | 67°F | Mostly Sunny | 0 to 10 mph SSE | 8% |
| Wednesday Night | 50°F | Mostly Cloudy then Chance Rain Showers | 5 mph SSE | 32% |
| Thursday | 68°F | Chance Rain Showers | 5 mph SSE | 32% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph SE | 11% |
| Friday | 70°F | Partly Sunny | 0 to 10 mph SE | 11% |
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 19, 2026.