Garrison, IA Weather & Growing Conditions
Overnight
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3am, then showers and thunderstorms likely between 3am and 4am, then patchy fog and occasional showers and thunderstorms. Cloudy, with a low around 67. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SE | 80% |
| Saturday | 80°F | Patchy Fog | 5 to 10 mph S | 80% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 68% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 53% |
| Sunday Night | 55°F | Chance Rain Showers | 15 mph NE | 43% |
| Monday | 63°F | Chance Rain Showers | 15 mph NE | 43% |
| Monday Night | 50°F | Chance Rain Showers | 10 mph NE | 35% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 26% |
| Tuesday Night | 46°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 | 66°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% |
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 Sep 19, 2026.