Thornhill, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thornhill, a city in Jefferson County, Kentucky.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind around 13 mph.
7-day forecast for Thornhill
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 13 mph S | 1% |
| Tonight | 63°F | Mostly Cloudy then Showers And Thunderstorms | 10 to 15 mph S | 98% |
| Wednesday | 70°F | Showers And Thunderstorms | 9 to 16 mph S | 98% |
| Wednesday Night | 51°F | Partly Cloudy | 3 to 8 mph SW | 5% |
| Thursday | 67°F | Mostly Sunny | 3 to 10 mph SW | 0% |
| Thursday Night | 46°F | Partly Cloudy | 1 to 5 mph W | 0% |
| Friday | 63°F | Partly Sunny | 1 to 8 mph NW | 10% |
| Friday Night | 42°F | Mostly Cloudy | 7 mph N | 10% |
| Saturday | 57°F | Mostly Sunny | 6 mph N | 3% |
| Saturday Night | 37°F | Partly Cloudy | 1 to 5 mph NW | 1% |
| Sunday | 59°F | Mostly Sunny | 1 to 8 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear then Slight Chance Rain Showers | 3 to 7 mph W | 15% |
| Monday | 62°F | Slight Chance Rain Showers then Sunny | 3 to 8 mph W | 15% |
| Monday Night | 39°F | Mostly Clear | 7 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Thornhill (38.288, -85.625). Updated through the day.
Growing snapshot for Thornhill
Last spring frost
Apr 3
First fall frost
Nov 3
Growing season
214 days
Hardiness zone
7a
More local growing data for Thornhill: nearby ZIP 40222 weather · frost dates · planting calendar · Kentucky frost dates
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Climate data from the nearest NOAA station, Louisville Bowman Fld, Ky (3.8 mi from Thornhill). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.