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
52°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy. High near 52, with temperatures falling to around 50 in the afternoon. West wind 7 to 18 mph, with gusts as high as 24 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for New Hartford
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Slight Chance Rain Showers | 7 to 18 mph W | 23% |
| Tonight | 44°F | Chance Rain Showers | 13 to 16 mph W | 46% |
| Thursday | 52°F | Chance Rain Showers | 15 mph NW | 49% |
| Thursday Night | 37°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 13 mph N | 17% |
| Friday | 48°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Friday Night | 28°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 56°F | Sunny | 3 to 7 mph W | 2% |
| Sunday Night | 35°F | Clear | 5 mph SW | 0% |
| Monday | 62°F | Sunny | 3 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 3 to 7 mph W | 0% |
| Tuesday | 61°F | Sunny | 3 mph NW | 0% |
| Tuesday Night | 39°F | Partly Cloudy | 2 mph NE | 1% |
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 Nov 4, 2026.