Oskaloosa, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oskaloosa, a city in Mahaska County, Iowa.
Overnight
47°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Cloudy. Low around 47, with temperatures rising to around 49 overnight. West wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
7-day forecast for Oskaloosa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Slight Chance Rain Showers | 14 mph W | 15% |
| Wednesday | 52°F | Slight Chance Rain Showers then Cloudy | 15 mph W | 19% |
| Wednesday Night | 45°F | Mostly Cloudy | 12 mph W | 10% |
| Thursday | 55°F | Rain Showers Likely | 8 to 12 mph WNW | 58% |
| Thursday Night | 41°F | Mostly Cloudy | 8 mph NNW | 13% |
| Friday | 50°F | Mostly Sunny | 3 to 8 mph N | 2% |
| Friday Night | 31°F | Partly Cloudy | 2 mph NNE | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 3 mph W | 0% |
| Saturday Night | 35°F | Mostly Clear | 1 to 5 mph W | 1% |
| Sunday | 59°F | Sunny | 5 mph W | 1% |
| Sunday Night | 37°F | Clear | 3 mph SW | 0% |
| Monday | 65°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 41°F | Clear | 5 mph W | 0% |
| Tuesday | 65°F | Sunny | 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Oskaloosa (41.292, -92.641). Updated through the day.
Growing snapshot for Oskaloosa
Last spring frost
Apr 21
First fall frost
Oct 16
Growing season
176 days
Hardiness zone
5b
More local growing data for Oskaloosa: nearby ZIP 52595 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Oskaloosa, Ia (2.8 mi from Oskaloosa). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.