Mount Vernon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Linn County, Iowa.
Overnight
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4am, then patchy fog and showers and thunderstorms likely. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SE | 58% |
| Saturday | 81°F | Patchy Fog | 5 to 10 mph S | 87% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NW | 75% |
| Sunday | 68°F | Rain Showers Likely | 10 to 15 mph NE | 58% |
| Sunday Night | 57°F | Chance Rain Showers | 10 to 15 mph NE | 46% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 53% |
| Monday Night | 51°F | Chance Rain Showers | 10 mph NE | 43% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 30% |
| Tuesday Night | 47°F | Mostly Clear | 5 to 10 mph NE | 5% |
| Wednesday | 66°F | Sunny | 5 mph NE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 6% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph E | 4% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph E | 5% |
Forecast source: National Weather Service (api.weather.gov) for Mount Vernon (41.924, -91.424). Updated through the day.
Growing snapshot for Mount Vernon
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
166 days
Hardiness zone
5a
More local growing data for Mount Vernon: nearby ZIP 52314 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Alburnett
Bertram
Cedar Rapids
Center Point
Central City
Coggon
Ely
Fairfax
Hiawatha
Marion
Palo
Prairieburg
Robins
Springville
Walker
Climate data from the nearest NOAA station, Cedar Rapids #1, Ia (10.7 mi from Mount Vernon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.