Garrison, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garrison, a city in Benton County, Iowa.
Overnight
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 67. Southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Garrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Chance Showers And Thunderstorms | 10 mph SE | 72% |
| Saturday | 80°F | Showers And Thunderstorms Likely | 5 to 10 mph SW | 68% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph N | 63% |
| Sunday | 67°F | Rain Showers Likely | 10 to 15 mph NE | 64% |
| Sunday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Monday | 63°F | Rain Showers Likely | 15 mph NE | 56% |
| Monday Night | 50°F | Rain Showers Likely | 10 to 15 mph NE | 56% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 32% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 65°F | Mostly Sunny | 5 mph NE | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph E | 3% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph E | 11% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph E | 9% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph E | 6% |
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.