Barnhart, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnhart, a community in Jefferson County, Missouri.
Overnight
54°F
Mostly Cloudy
Mostly cloudy, with a low around 54. Southwest wind around 6 mph.
7-day forecast for Barnhart
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Cloudy | 6 mph SW | 9% |
| Wednesday | 60°F | Slight Chance Drizzle then Mostly Cloudy | 6 to 10 mph W | 12% |
| Wednesday Night | 42°F | Mostly Clear | 5 mph W | 0% |
| Thursday | 66°F | Sunny | 5 to 8 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 5 mph NW | 3% |
| Friday | 57°F | Partly Sunny | 5 to 8 mph NW | 2% |
| Friday Night | 35°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Sunny | 5 mph NW | 1% |
| Sunday Night | 35°F | Clear | 1 mph W | 0% |
| Monday | 66°F | Sunny | 3 mph SW | 0% |
| Monday Night | 40°F | Clear | 3 mph SW | 1% |
| Tuesday | 69°F | Sunny | 3 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Barnhart (38.337, -90.403). Updated through the day.
Growing snapshot for Barnhart
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
More local growing data for Barnhart: nearby ZIP 63053 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Arnold
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De Soto
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Festus
Herculaneum
High Ridge
Hillsboro
Horine
Imperial
Kimmswick
Murphy
Olympian Village
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Peaceful Village
Pevely
Raintree Plantation
Scotsdale
Summer Set
Climate data from the nearest NOAA station, Festus, Mo (9.4 mi from Barnhart). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.