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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Atkins
Belle Plaine
Blairstown
Dysart
Keystone
Luzerne
Mount Auburn
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 Sep 19, 2026.