Irondale, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irondale, a city in Washington County, Missouri.
Today
88°F
Sunny
Sunny, with a high near 88. Southeast wind around 5 mph.
7-day forecast for Irondale
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 5 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 1 to 5 mph S | 0% |
| Wednesday | 92°F | Sunny | 1 to 5 mph S | 3% |
| Wednesday Night | 71°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 47% |
| Thursday | 89°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph S | 66% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph S | 51% |
| Friday | 88°F | Chance Showers And Thunderstorms | 3 mph SW | 51% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph SW | 46% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 3 mph SW | 30% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph S | 16% |
| Sunday | 92°F | Sunny | 6 mph SW | 3% |
| Sunday Night | 72°F | Mostly Clear | 6 mph S | 3% |
| Monday | 93°F | Sunny | 7 mph SW | 3% |
| Monday Night | 73°F | Mostly Clear | 6 mph S | 6% |
Forecast source: National Weather Service (api.weather.gov) for Irondale (37.837, -90.670). Updated through the day.
Growing snapshot for Irondale
Last spring frost
Apr 11
First fall frost
Oct 28
Growing season
198 days
Hardiness zone
6b
More local growing data for Irondale: nearby ZIP 63648 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Potosi 4 Sw, Mo (9.5 mi from Irondale). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.