New Hartford, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Hartford, a city in Butler County, Iowa.
Today
78°F
Patchy Fog
Patchy fog and showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 78, with temperatures falling to around 75 in the afternoon. West southwest wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for New Hartford
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Fog | 8 mph WSW | 60% |
| Tonight | 59°F | Chance Showers And Thunderstorms | 12 mph N | 34% |
| Sunday | 66°F | Chance Rain Showers then Chance Drizzle | 15 mph NE | 34% |
| Sunday Night | 53°F | Chance Rain Showers | 14 mph ENE | 39% |
| Monday | 62°F | Chance Rain Showers | 15 mph ENE | 44% |
| Monday Night | 48°F | Chance Rain Showers | 7 to 13 mph NE | 44% |
| Tuesday | 60°F | Partly Sunny | 7 to 10 mph ENE | 13% |
| Tuesday Night | 44°F | Mostly Clear | 3 to 7 mph ENE | 2% |
| Wednesday | 65°F | Sunny | 6 mph ENE | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 1 to 5 mph E | 4% |
| Thursday | 66°F | Partly Sunny | 5 mph E | 9% |
| Thursday Night | 52°F | Partly Cloudy | 3 mph E | 5% |
| Friday | 69°F | Mostly Sunny | 2 to 6 mph ESE | 4% |
| Friday Night | 53°F | Partly Cloudy | 5 mph ESE | 9% |
Forecast source: National Weather Service (api.weather.gov) for New Hartford (42.568, -92.621). Updated through the day.
Growing snapshot for New Hartford
Last spring frost
Apr 27
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
More local growing data for New Hartford: nearby ZIP 50660 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Waterloo Muni Ap, Ia (12.4 mi from New Hartford). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.