Blairstown, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Blairstown, a city in Benton County, Iowa.
Today
51°F
Slight Chance Rain Showers
A slight chance of rain showers before 3pm. Cloudy, with a high near 51. West wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Blairstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 51°F | Slight Chance Rain Showers | 15 mph W | 22% |
| Tonight | 43°F | Cloudy then Slight Chance Rain Showers | 10 to 15 mph W | 16% |
| Thursday | 54°F | Chance Rain Showers | 10 mph NW | 43% |
| Thursday Night | 38°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday | 49°F | Mostly Sunny | 5 to 10 mph N | 1% |
| Friday Night | 29°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 57°F | Sunny | 5 mph W | 2% |
| Sunday Night | 35°F | Clear | 5 mph SW | 0% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 0 mph | 1% |
Forecast source: National Weather Service (api.weather.gov) for Blairstown (41.906, -92.082). Updated through the day.
Growing snapshot for Blairstown
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
More local growing data for Blairstown: nearby ZIP 52209 weather · frost dates · planting calendar · Iowa frost dates
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Climate data from the nearest NOAA station, Belle Plaine, Ia (9.4 mi from Blairstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.