Ossian, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ossian, a city in Winneshiek County, Iowa.
Overnight
61°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 61. East wind 12 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Ossian
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Showers And Thunderstorms | 12 to 15 mph E | 91% |
| Saturday | 71°F | Showers And Thunderstorms Likely | 7 to 10 mph S | 72% |
| Saturday Night | 57°F | Chance Showers And Thunderstorms | 8 to 13 mph N | 49% |
| Sunday | 66°F | Slight Chance Rain Showers then Mostly Cloudy | 16 mph NE | 17% |
| Sunday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph NE | 18% |
| Monday | 61°F | Chance Rain Showers | 12 mph NE | 25% |
| Monday Night | 46°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 9 mph NE | 19% |
| Tuesday | 60°F | Mostly Sunny | 8 mph NE | 12% |
| Tuesday Night | 42°F | Mostly Clear | 5 mph NE | 2% |
| Wednesday | 64°F | Sunny | 5 mph E | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 2 mph E | 3% |
| Thursday | 65°F | Mostly Sunny | 3 mph E | 10% |
| Thursday Night | 50°F | Partly Cloudy | 1 mph E | 3% |
| Friday | 68°F | Mostly Sunny | 3 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov) for Ossian (43.147, -91.765). Updated through the day.
Growing snapshot for Ossian
Last spring frost
May 1
First fall frost
Oct 3
Growing season
153 days
Hardiness zone
5a
More local growing data for Ossian: nearby ZIP 52161 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Postville, Ia (10.3 mi from Ossian). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.