New Haven, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Haven, a community in Mitchell County, Iowa.
Tonight
48°F
Showers And Thunderstorms
Rain showers before 9pm, then showers and thunderstorms. Cloudy. Low around 48, with temperatures rising to around 52 overnight. Northeast wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for New Haven
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Showers And Thunderstorms | 9 mph NE | 86% |
| Wednesday | 51°F | Rain Showers | 9 to 15 mph SW | 78% |
| Wednesday Night | 43°F | Rain Showers | 15 mph W | 80% |
| Thursday | 50°F | Rain Showers Likely | 14 mph NW | 70% |
| Thursday Night | 36°F | Mostly Cloudy | 8 to 12 mph N | 10% |
| Friday | 47°F | Partly Sunny | 3 to 9 mph N | 0% |
| Friday Night | 30°F | Partly Cloudy | 2 mph NW | 0% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 6 mph W | 5% |
| Sunday | 57°F | Sunny | 8 mph W | 9% |
| Sunday Night | 36°F | Mostly Clear | 7 mph SW | 1% |
| Monday | 60°F | Mostly Sunny | 7 to 12 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph W | 1% |
| Tuesday | 58°F | Mostly Sunny | 7 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for New Haven (43.284, -92.642). Updated through the day.
Growing snapshot for New Haven
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
163 days
Hardiness zone
5a
More local growing data for New Haven: nearby ZIP 50460 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Osage, Ia (7.1 mi from New Haven). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.