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Garrison, IA Weather & Growing Conditions

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

Today
80°F
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
A chance of showers and thunderstorms before 11am, then showers and thunderstorms likely. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 80. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.

7-day forecast for Garrison

WhenTempForecastWindPrecip
Today 80°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 5 to 10 mph SW 64%
Tonight 61°F Showers And Thunderstorms Likely 5 to 10 mph N 67%
Sunday 67°F Chance Rain Showers 10 to 15 mph NE 53%
Sunday Night 55°F Chance Rain Showers 15 mph NE 44%
Monday 63°F Chance Rain Showers 15 mph NE 44%
Monday Night 50°F Chance Rain Showers 10 mph NE 34%
Tuesday 61°F Chance Rain Showers then Partly Sunny 10 mph NE 26%
Tuesday Night 45°F Mostly Clear 5 to 10 mph NE 4%
Wednesday 66°F Sunny 5 mph NE 0%
Wednesday Night 50°F Partly Cloudy 5 mph E 3%
Thursday 67°F Partly Sunny 5 mph E 9%
Thursday Night 53°F Partly Cloudy 0 to 5 mph E 7%
Friday 69°F Mostly Sunny 5 mph E 6%
Friday Night 54°F Partly Cloudy 5 mph E 7%

Forecast source: National Weather Service (api.weather.gov) for Garrison (42.145, -92.144). Updated through the day.

Growing snapshot for Garrison

Last spring frost
May 3
First fall frost
Oct 3
Growing season
151 days
Hardiness zone
5a

More local growing data for Garrison: nearby ZIP 52229 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Vinton, Ia (8.5 mi from Garrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.