Hartland, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartland, a village in Waukesha County, Wisconsin.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind 0 to 10 mph.
7-day forecast for Hartland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 0 to 10 mph SW | 10% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 88% |
| Wednesday | 74°F | Patchy Fog then Chance Showers And Thunderstorms | 5 mph W | 70% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 42% |
| Thursday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph E | 21% |
| Thursday Night | 58°F | Mostly Clear | 0 to 5 mph E | 7% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 6% |
| Saturday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 29% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 52% |
| Monday | 82°F | Chance Rain Showers | 5 mph S | 43% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 43% |
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
Nearby towns & communities
Big Bend
Brookfield
Butler
Chenequa
Delafield
Dousman
Eagle
Elm Grove
Lac La Belle
Lannon
Menomonee Falls
Merton
Mukwonago
Muskego
Nashotah
New Berlin
North Lake
North Prairie
Oconomowoc
Oconomowoc Lake
Okauchee Lake
Pewaukee
Pewaukee
Potter Lake
Summit
Sussex
Vernon
Wales
Waukesha
Waukesha
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 Aug 4, 2026.