Prospect Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Prospect Heights, a city in Cook County, Illinois.
Overnight
65°F
Mostly Clear
Mostly clear, with a low around 65. South wind around 5 mph.
7-day forecast for Prospect Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 85°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Tuesday Night | 69°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SW | 37% |
| Wednesday | 79°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph WSW | 73% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 0 to 5 mph NW | 87% |
| Thursday | 78°F | Rain Showers Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 61% |
| Thursday Night | 62°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph S | 19% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 7% |
| Saturday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 21% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 21% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 46% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 46% |
Forecast source: National Weather Service (api.weather.gov) for Prospect Heights (42.104, -87.929). Updated through the day.
Growing snapshot for Prospect Heights
Last spring frost
Apr 19
First fall frost
Oct 26
Growing season
190 days
Hardiness zone
6a
More local growing data for Prospect Heights: nearby ZIP 60070 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Chicago Palwaukee Ap, Il (1.7 mi from Prospect Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.