Blairstown, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Blairstown, a city in Benton County, Iowa.
Today
81°F
Occasional Showers And Thunderstorms then Chance Showers And Thunderstorms
Occasional showers and thunderstorms before 11am, then a chance of showers and thunderstorms between 11am and 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind 5 to 10 mph. Chance of precipitation is 80%.
7-day forecast for Blairstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Occasional Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph S | 82% |
| Tonight | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph NW | 68% |
| Sunday | 67°F | Rain Showers Likely | 10 to 15 mph NE | 63% |
| Sunday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 50% |
| Monday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 50% |
| Monday Night | 50°F | Chance Rain Showers | 10 mph NE | 38% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 27% |
| Tuesday Night | 46°F | Mostly Clear | 5 mph NE | 4% |
| Wednesday | 66°F | Sunny | 5 mph NE | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 67°F | Partly Sunny | 5 mph E | 8% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph E | 6% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 6% |
| Friday Night | 54°F | Partly Cloudy | 5 mph E | 7% |
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 Sep 19, 2026.