Hartland, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartland, a village in Waukesha County, Wisconsin.
Tonight
58°F
Light Rain
Rain. Cloudy, with a low around 58. South wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Hartland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Light Rain | 10 mph S | 92% |
| Wednesday | 61°F | Chance Light Rain | 10 to 15 mph S | 31% |
| Wednesday Night | 45°F | Cloudy then Chance Light Rain | 15 mph SW | 36% |
| Thursday | 54°F | Light Rain Likely | 10 to 15 mph W | 58% |
| Thursday Night | 37°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 31% |
| Friday | 47°F | Mostly Cloudy | 10 to 15 mph N | 9% |
| Friday Night | 32°F | Mostly Cloudy | 0 to 5 mph N | 3% |
| Saturday | 50°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Sunday | 56°F | Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Sunday Night | 35°F | Partly Cloudy | 5 mph W | 4% |
| Monday | 58°F | Mostly Sunny | 5 to 15 mph SW | 2% |
| Monday Night | 39°F | Partly Cloudy | 5 to 10 mph W | 1% |
| Tuesday | 59°F | Mostly Sunny | 5 to 10 mph NW | 0% |
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 Nov 4, 2026.