Ossian, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ossian, a city in Winneshiek County, Iowa.
This Afternoon
51°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy. High near 51, with temperatures falling to around 48 in the afternoon. Southwest wind around 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Ossian
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Slight Chance Rain Showers | 16 mph SW | 24% |
| Tonight | 44°F | Rain Showers | 12 to 15 mph W | 82% |
| Thursday | 49°F | Chance Rain Showers | 13 to 16 mph NW | 45% |
| Thursday Night | 34°F | Mostly Cloudy | 9 to 15 mph N | 11% |
| Friday | 45°F | Mostly Sunny | 7 to 12 mph N | 0% |
| Friday Night | 26°F | Mostly Clear | 6 mph NW | 0% |
| Saturday | 49°F | Mostly Sunny | 5 to 8 mph W | 0% |
| Saturday Night | 33°F | Partly Cloudy | 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 mph W | 1% |
| Sunday Night | 36°F | Clear | 5 mph SW | 0% |
| Monday | 61°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 2 to 6 mph W | 0% |
| Tuesday | 58°F | Sunny | 3 mph NW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 2 mph NW | 2% |
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 Nov 5, 2026.