Garrison, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garrison, a city in Benton County, Iowa.
Tonight
48°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 4am. Mostly cloudy. Low around 48, with temperatures rising to around 51 overnight. South wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Garrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Slight Chance Showers And Thunderstorms | 10 mph S | 21% |
| Wednesday | 54°F | Chance Rain Showers | 10 to 15 mph SW | 37% |
| Wednesday Night | 43°F | Cloudy then Chance Rain Showers | 15 mph SW | 37% |
| Thursday | 53°F | Rain Showers Likely | 10 to 15 mph NW | 62% |
| Thursday Night | 39°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 16% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph NW | 1% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 35°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 37°F | Mostly Clear | 5 mph SW | 2% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
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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Blairstown
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Newhall
Norway
Shellsburg
Urbana
Van Horne
Vinton
Walford
Watkins
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 Nov 4, 2026.