Hartford, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartford, a city in Washington County, Wisconsin.
This Afternoon
68°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 68. 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 Hartford
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Chance Rain Showers | 10 mph E | 35% |
| Tonight | 58°F | Showers And Thunderstorms | 10 to 15 mph E | 100% |
| Saturday | 69°F | Showers And Thunderstorms | 10 to 15 mph E | 96% |
| Saturday Night | 58°F | Showers And Thunderstorms Likely | 10 mph NE | 72% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 38% |
| Sunday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 16% |
| Monday | 62°F | Mostly Cloudy | 10 to 15 mph NE | 13% |
| Monday Night | 48°F | Mostly Cloudy | 5 to 15 mph NE | 14% |
| Tuesday | 61°F | Partly Sunny | 5 to 15 mph NE | 14% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 63°F | Mostly Sunny | 5 to 10 mph NE | 8% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 2% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Hartford (43.322, -88.378). Updated through the day.
Growing snapshot for Hartford
Last spring frost
May 8
First fall frost
Oct 3
Growing season
148 days
Hardiness zone
5a
More local growing data for Hartford: nearby ZIP 53027 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hartford Wwtp, Wi (2.3 mi from Hartford). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.