Prospect Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Prospect Heights, a city in Cook County, Illinois.
This Afternoon
71°F
Chance Rain
A chance of rain before 3pm, then a chance of rain and a slight chance of thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 69 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Prospect Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Chance Rain | 15 to 20 mph S | 41% |
| Tonight | 61°F | Rain | 15 mph S | 81% |
| Wednesday | 64°F | Rain Likely | 15 mph SSW | 58% |
| Wednesday Night | 48°F | Slight Chance Rain then Mostly Cloudy | 15 mph SW | 19% |
| Thursday | 57°F | Chance Rain | 10 to 15 mph WSW | 32% |
| Thursday Night | 42°F | Rain Likely | 5 to 10 mph WNW | 55% |
| Friday | 53°F | Chance Rain | 10 to 15 mph N | 33% |
| Friday Night | 37°F | Mostly Cloudy | 5 to 10 mph NNW | 11% |
| Saturday | 53°F | Mostly Sunny | 5 mph WNW | 8% |
| Saturday Night | 36°F | Partly Cloudy | 0 to 5 mph WSW | 7% |
| Sunday | 58°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 17% |
| Sunday Night | 37°F | Mostly Clear | 5 mph WNW | 9% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph WSW | 4% |
| Monday Night | 41°F | Partly Cloudy | 5 to 10 mph W | 2% |
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 Nov 3, 2026.