Shellsburg, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Shellsburg, a city in Benton County, Iowa.
Tonight
49°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 4am. Mostly cloudy. Low around 49, with temperatures rising to around 52 overnight. Southwest wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Shellsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph SW | 23% |
| Wednesday | 54°F | Chance Rain Showers | 10 to 15 mph W | 30% |
| Wednesday Night | 44°F | Slight Chance Rain Showers | 10 to 15 mph W | 22% |
| Thursday | 54°F | Chance Rain Showers | 10 mph NW | 43% |
| Thursday Night | 38°F | Mostly Cloudy | 10 mph N | 13% |
| Friday | 49°F | Mostly Sunny | 5 to 10 mph N | 1% |
| Friday Night | 29°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 56°F | Sunny | 5 mph W | 3% |
| Sunday Night | 35°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 0% |
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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Urbana
Van Horne
Vinton
Walford
Watkins
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 Nov 4, 2026.