La Harpe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for La Harpe, a city in Hancock County, Illinois.
Overnight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast for La Harpe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 10 to 15 mph SW | 8% |
| Wednesday | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph W | 15% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 4% |
| Thursday | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph W | 20% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 25% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 10% |
| Friday Night | 33°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 58°F | Sunny | 5 mph W | 2% |
| Sunday Night | 36°F | Clear | 0 to 5 mph W | 0% |
| Monday | 64°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Clear | 5 mph W | 0% |
| Tuesday | 65°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for La Harpe (40.585, -90.970). Updated through the day.
Growing snapshot for La Harpe
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6a
More local growing data for La Harpe: nearby ZIP 61450 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, La Harpe, Il (1.2 mi from La Harpe). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.