Mount Vernon, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Vernon, a city in Linn County, Iowa.
This Afternoon
67°F
Showers And Thunderstorms
Rain showers before 3pm, then showers and thunderstorms. Mostly cloudy. High near 67, with temperatures falling to around 65 in the afternoon. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
7-day forecast for Mount Vernon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Showers And Thunderstorms | 15 mph S | 89% |
| Tonight | 50°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 56% |
| Wednesday | 54°F | Chance Rain Showers | 15 mph SW | 38% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 15 mph SW | 24% |
| Thursday | 53°F | Rain Showers Likely | 10 mph W | 61% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph N | 21% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 0 to 5 mph SW | 3% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
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
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Alburnett
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Hiawatha
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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 Nov 3, 2026.