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
62°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 62. Southeast wind 10 to 14 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for New Haven
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Showers And Thunderstorms | 10 to 14 mph SE | 96% |
| Saturday | 70°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph SW | 57% |
| Saturday Night | 55°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph N | 23% |
| Sunday | 66°F | Mostly Cloudy | 16 mph NE | 11% |
| Sunday Night | 49°F | Mostly Cloudy then Slight Chance Rain Showers | 14 mph NE | 24% |
| Monday | 61°F | Chance Rain Showers | 10 to 14 mph NE | 26% |
| Monday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 10 mph NE | 19% |
| Tuesday | 60°F | Mostly Sunny | 9 mph E | 9% |
| Tuesday Night | 42°F | Mostly Clear | 6 mph E | 2% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 46°F | Partly Cloudy | 5 mph E | 5% |
| Thursday | 66°F | Partly Sunny | 5 mph SE | 13% |
| Thursday Night | 49°F | Partly Cloudy | 3 mph E | 4% |
| Friday | 68°F | Mostly Sunny | 2 to 6 mph SE | 4% |
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 Sep 19, 2026.