Mason City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mason City, a city in Cerro Gordo County, Iowa.
Today
72°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. High near 72, with temperatures falling to around 70 in the afternoon. North northwest wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mason City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Patchy Fog | 8 mph NNW | 51% |
| Tonight | 56°F | Slight Chance Rain Showers | 10 mph NNE | 22% |
| Sunday | 65°F | Mostly Cloudy | 13 mph NE | 9% |
| Sunday Night | 50°F | Mostly Cloudy then Chance Rain Showers | 10 mph ENE | 25% |
| Monday | 61°F | Chance Rain Showers | 10 mph ENE | 39% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 5 to 8 mph ENE | 30% |
| Tuesday | 60°F | Mostly Sunny | 7 mph ENE | 12% |
| Tuesday Night | 42°F | Mostly Clear | 5 mph E | 1% |
| Wednesday | 64°F | Sunny | 5 mph E | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 2 mph ESE | 6% |
| Thursday | 65°F | Partly Sunny | 1 to 5 mph SE | 9% |
| Thursday Night | 50°F | Partly Cloudy | 2 mph ESE | 4% |
| Friday | 68°F | Mostly Sunny | 1 to 5 mph SE | 5% |
| Friday Night | 51°F | Partly Cloudy | 3 mph SE | 12% |
Forecast source: National Weather Service (api.weather.gov) for Mason City (43.149, -93.200). Updated through the day.
Growing snapshot for Mason City
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Mason City: nearby ZIP 50401 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mason City, Ia (0.7 mi from Mason City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.