Garrison, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garrison, a city in Benton County, Iowa.
Today
81°F
Partly Sunny then Chance Showers And Thunderstorms
A slight chance of rain showers between noon and 1pm, then a chance of showers and thunderstorms. Partly sunny. High near 81, with temperatures falling to around 78 in the afternoon. West wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Garrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph W | 44% |
| Tonight | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 82% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 5 mph N | 62% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 26% |
| Thursday | 80°F | Sunny | 0 to 5 mph NE | 6% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 1% |
| Friday | 83°F | Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 12% |
| Saturday | 86°F | Sunny | 5 mph S | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 10 mph S | 17% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph S | 17% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 37% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 mph S | 37% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 mph E | 35% |
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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Norway
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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 Aug 4, 2026.