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
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 78, with temperatures falling to around 76 in the afternoon. West northwest wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for New Hartford
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Showers And Thunderstorms | 9 mph WNW | 77% |
| Tonight | 60°F | Showers And Thunderstorms Likely | 5 to 8 mph N | 67% |
| Wednesday | 73°F | Chance Showers And Thunderstorms then Partly Sunny | 5 mph NNE | 32% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 5 mph N | 13% |
| Thursday | 79°F | Sunny | 0 to 3 mph E | 1% |
| Thursday Night | 59°F | Mostly Clear | 3 mph SSE | 0% |
| Friday | 82°F | Sunny | 2 to 10 mph S | 8% |
| Friday Night | 65°F | Mostly Clear | 8 mph S | 12% |
| Saturday | 85°F | Sunny | 5 to 9 mph S | 10% |
| Saturday Night | 69°F | Mostly Clear then Chance Showers And Thunderstorms | 9 to 13 mph S | 25% |
| Sunday | 85°F | Chance Showers And Thunderstorms then Mostly Sunny | 12 mph S | 25% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 6 to 9 mph SSE | 34% |
| Monday | 84°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 8 to 12 mph SSE | 34% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 7 to 12 mph E | 35% |
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 Aug 4, 2026.