Garrison, IA Weather & Growing Conditions
Tonight
48°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers between 3am and 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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph S | 15% |
| Wednesday | 54°F | Chance Rain Showers | 10 to 15 mph W | 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). Updated through the day.
Growing snapshot for Garrison, IA
Last spring frost
May 3
First fall frost
Oct 3
Growing season
151 days
Hardiness zone
5a
Explore more for Garrison, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Vinton, Ia (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.