Hartland, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartland, a village in Waukesha County, Wisconsin.
This Afternoon
69°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 69. East wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hartland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Chance Rain Showers | 10 mph E | 41% |
| Tonight | 59°F | Showers And Thunderstorms | 10 to 15 mph E | 96% |
| Saturday | 71°F | Showers And Thunderstorms | 10 to 15 mph SE | 95% |
| Saturday Night | 58°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 44% |
| Sunday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 22% |
| Monday | 62°F | Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Monday Night | 49°F | Slight Chance Rain Showers | 5 to 15 mph NE | 15% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph NE | 15% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 9% |
| Wednesday Night | 49°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Hartland (43.102, -88.336). Updated through the day.
Growing snapshot for Hartland
Last spring frost
Apr 30
First fall frost
Oct 16
Growing season
167 days
Hardiness zone
5b
More local growing data for Hartland: nearby ZIP 53029 weather · frost dates · planting calendar · Wisconsin frost dates
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Climate data from the nearest NOAA station, Richfield 3 Ssw, Wi (8 mi from Hartland). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.