Rock Rapids, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Rapids, a city in Lyon County, Iowa.
Today
73°F
Patchy Smoke then Chance Showers And Thunderstorms
Patchy smoke and scattered rain showers before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 73. Northwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Rock Rapids
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Smoke then Chance Showers And Thunderstorms | 5 to 10 mph NW | 67% |
| Tonight | 52°F | Scattered Rain Showers then Partly Cloudy | 0 to 5 mph W | 43% |
| Wednesday | 76°F | Mostly Sunny | 0 mph | 1% |
| Wednesday Night | 53°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 81°F | Sunny | 5 to 10 mph SSW | 0% |
| Thursday Night | 61°F | Mostly Clear | 5 to 10 mph S | 2% |
| Friday | 86°F | Sunny | 5 to 10 mph SSW | 7% |
| Friday Night | 64°F | Mostly Clear | 5 to 10 mph SSE | 13% |
| Saturday | 88°F | Sunny | 5 to 15 mph S | 5% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 10 to 15 mph ESE | 28% |
| Sunday | 86°F | Mostly Sunny | 10 mph SE | 14% |
| Sunday Night | 66°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 to 15 mph E | 26% |
| Monday | 85°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph E | 26% |
| Monday Night | 66°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 21% |
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 Aug 4, 2026.