New Haven, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Haven, a community in Mitchell County, Iowa.
Overnight
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for New Haven
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Chance Showers And Thunderstorms | 9 mph S | 26% |
| Tuesday | 73°F | Showers And Thunderstorms Likely | 9 mph W | 64% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph NW | 62% |
| Wednesday | 73°F | Mostly Sunny | 5 mph N | 3% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph NW | 1% |
| Thursday | 77°F | Sunny | 1 to 5 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 5 mph S | 1% |
| Friday | 80°F | Sunny | 5 to 12 mph S | 10% |
| Friday Night | 64°F | Mostly Clear | 9 mph S | 13% |
| Saturday | 82°F | Sunny | 6 to 10 mph S | 11% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 12 mph SW | 34% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 10 mph S | 34% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 33% |
| Monday | 81°F | Chance Showers And Thunderstorms | 10 mph SE | 33% |
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 Aug 4, 2026.