Thornhill, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thornhill, a city in Jefferson County, Kentucky.
Overnight
71°F
Partly Cloudy
Partly cloudy, with a low around 71. East wind around 6 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Thornhill
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Partly Cloudy | 6 mph E | 11% |
| Saturday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph S | 24% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 mph S | 29% |
| Sunday | 93°F | Mostly Sunny | 6 to 9 mph SW | 9% |
| Sunday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 8 mph N | 22% |
| Monday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 9 mph NE | 46% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 46% |
| Tuesday | 77°F | Chance Rain Showers then Chance Showers And Thunderstorms | 9 mph NE | 41% |
| Tuesday Night | 61°F | Chance Showers And Thunderstorms | 6 to 12 mph N | 41% |
| Wednesday | 74°F | Slight Chance Rain Showers then Partly Sunny | 6 to 9 mph N | 19% |
| Wednesday Night | 59°F | Mostly Cloudy | 5 to 9 mph N | 13% |
| Thursday | 74°F | Partly Sunny | 6 to 9 mph N | 7% |
| Thursday Night | 59°F | Partly Cloudy | 5 to 9 mph N | 7% |
| Friday | 74°F | Mostly Sunny | 6 to 9 mph N | 4% |
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
Nearby towns & communities
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Cambridge
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Hills and Dales
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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 Sep 19, 2026.