Hillsboro, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Jefferson County, Missouri.
Tonight
50°F
Light Rain
Rain and a slight chance of thunderstorms before 3am, then a chance of rain showers between 3am and 4am. Cloudy, with a low around 50. Southwest wind 6 to 12 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Light Rain | 6 to 12 mph SW | 85% |
| Wednesday | 63°F | Mostly Cloudy | 8 mph W | 3% |
| Wednesday Night | 39°F | Mostly Clear | 3 mph SW | 0% |
| Thursday | 66°F | Sunny | 6 mph W | 3% |
| Thursday Night | 40°F | Mostly Cloudy | 3 mph NW | 13% |
| Friday | 57°F | Partly Sunny | 3 to 7 mph NW | 4% |
| Friday Night | 35°F | Mostly Cloudy | 3 mph NW | 3% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 62°F | Sunny | 1 to 5 mph W | 7% |
| Sunday Night | 32°F | Mostly Clear | 3 mph W | 5% |
| Monday | 67°F | Sunny | 5 mph SW | 1% |
| Monday Night | 37°F | Mostly Clear | 3 mph SW | 1% |
| Tuesday | 69°F | Sunny | 3 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Hillsboro (38.233, -90.567). Updated through the day.
Growing snapshot for Hillsboro
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
6b
More local growing data for Hillsboro: nearby ZIP 63050 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Arnold
Barnhart
Briarwood Estates
Byrnes Mill
Cedar Hill
Cedar Hill Lakes
Crystal City
De Soto
Fenton
Festus
Herculaneum
High Ridge
Horine
Imperial
Kimmswick
Murphy
Olympian Village
Parkdale
Peaceful Village
Pevely
Raintree Plantation
Scotsdale
Summer Set
Climate data from the nearest NOAA station, Festus, Mo (10 mi from Hillsboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.