Shellsburg, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Shellsburg, a city in Benton County, Iowa.
Overnight
67°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 1am, then showers and thunderstorms likely between 1am and 2am, then a chance of showers and thunderstorms between 2am and 4am, then patchy fog and occasional showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Shellsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SE | 78% |
| Saturday | 81°F | Patchy Fog | 5 to 10 mph S | 82% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 67% |
| Sunday | 68°F | Chance Rain Showers | 10 to 15 mph NE | 53% |
| Sunday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 47% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 47% |
| Monday Night | 50°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 28% |
| Tuesday Night | 46°F | Mostly Clear | 5 to 10 mph NE | 5% |
| Wednesday | 66°F | Sunny | 5 mph NE | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph NE | 2% |
| Thursday | 68°F | Partly Sunny | 5 mph E | 8% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph E | 5% |
| Friday | 70°F | Mostly Sunny | 5 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov) for Shellsburg (42.093, -91.871). Updated through the day.
Growing snapshot for Shellsburg
Last spring frost
May 3
First fall frost
Oct 3
Growing season
151 days
Hardiness zone
5a
More local growing data for Shellsburg: nearby ZIP 52332 weather · frost dates · planting calendar · Iowa frost dates
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Climate data from the nearest NOAA station, Vinton, Ia (7.9 mi from Shellsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.