Griswold, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Griswold, a city in Cass County, Iowa.
Tonight
42°F
Chance Rain Showers
A chance of rain showers before 1am. Cloudy. Low around 42, with temperatures rising to around 44 overnight. Northwest wind 13 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Griswold
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 42°F | Chance Rain Showers | 13 to 20 mph NW | 31% |
| Wednesday | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 14 to 18 mph WNW | 15% |
| Wednesday Night | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 8 to 12 mph WNW | 20% |
| Thursday | 52°F | Chance Rain Showers | 9 to 13 mph NW | 49% |
| Thursday Night | 37°F | Mostly Cloudy | 5 to 9 mph NNW | 6% |
| Friday | 53°F | Partly Sunny | 2 to 6 mph N | 2% |
| Friday Night | 34°F | Mostly Cloudy | 1 mph E | 0% |
| Saturday | 57°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 37°F | Mostly Clear | 3 mph W | 3% |
| Sunday | 62°F | Sunny | 2 to 7 mph WSW | 5% |
| Sunday Night | 40°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 65°F | Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 6 mph NW | 0% |
| Tuesday | 64°F | Mostly Sunny | 3 to 7 mph ENE | 1% |
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
Nearby towns & communities
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 Nov 4, 2026.