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Griswold, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Griswold, a city in Cass County, Iowa.

This Afternoon
82°F
Slight Chance Showers And Thunderstorms
A chance of rain showers before 4pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 82, with temperatures falling to around 76 in the afternoon. North northwest wind 5 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Griswold

WhenTempForecastWindPrecip
This Afternoon 82°F Slight Chance Showers And Thunderstorms 5 to 9 mph NNW 28%
Tonight 61°F Chance Showers And Thunderstorms 7 to 10 mph N 51%
Sunday 66°F Slight Chance Drizzle then Chance Rain Showers 8 to 13 mph NNE 39%
Sunday Night 56°F Rain Showers Likely 7 to 12 mph NE 59%
Monday 59°F Rain Showers 12 mph NE 75%
Monday Night 51°F Rain Showers Likely then Mostly Cloudy 6 to 10 mph NE 63%
Tuesday 61°F Mostly Cloudy 8 mph NE 3%
Tuesday Night 46°F Partly Cloudy 2 to 7 mph ENE 2%
Wednesday 64°F Mostly Sunny 2 to 6 mph E 1%
Wednesday Night 52°F Mostly Cloudy 5 mph ESE 13%
Thursday 67°F Chance Rain Showers 3 to 7 mph SE 34%
Thursday Night 57°F Chance Rain Showers 5 mph SE 28%
Friday 69°F Slight Chance Rain Showers 2 to 6 mph ESE 19%
Friday Night 59°F Mostly Cloudy then Chance Rain Showers 5 mph ESE 26%

Forecast source: National Weather Service (api.weather.gov) for Griswold (41.234, -95.139). Updated through the day.

Growing snapshot for Griswold

Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
174 days
Hardiness zone
5b

More local growing data for Griswold: nearby ZIP 51535 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Oakland, Ia (14.4 mi from Griswold). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.