Charter Oak, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Charter Oak, a city in Crawford County, Iowa.
Today
72°F
Patchy Fog then Mostly Cloudy
Patchy fog and a slight chance of rain showers before noon. Mostly cloudy. High near 72, with temperatures falling to around 70 in the afternoon. North wind 6 to 9 mph. Chance of precipitation is 20%.
7-day forecast for Charter Oak
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Patchy Fog then Mostly Cloudy | 6 to 9 mph N | 20% |
| Tonight | 58°F | Mostly Cloudy | 9 mph NNE | 12% |
| Sunday | 63°F | Slight Chance Drizzle then Chance Rain Showers | 8 to 12 mph NE | 30% |
| Sunday Night | 54°F | Chance Rain Showers | 9 mph ENE | 46% |
| Monday | 59°F | Rain Showers Likely | 9 mph ENE | 60% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph ENE | 46% |
| Tuesday | 61°F | Mostly Sunny | 6 mph E | 9% |
| Tuesday Night | 45°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 64°F | Mostly Sunny | 5 mph SE | 2% |
| Wednesday Night | 51°F | Partly Cloudy then Chance Rain Showers | 3 mph SE | 27% |
| Thursday | 66°F | Chance Rain Showers | 2 to 6 mph SE | 27% |
| Thursday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 15% |
| Friday | 68°F | Slight Chance Rain Showers | 3 to 7 mph SE | 15% |
| Friday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 18% |
Forecast source: National Weather Service (api.weather.gov) for Charter Oak (42.068, -95.590). Updated through the day.
Growing snapshot for Charter Oak
Last spring frost
May 3
First fall frost
Oct 1
Growing season
151 days
Hardiness zone
5a
More local growing data for Charter Oak: nearby ZIP 51439 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mapleton No.2, Ia (11.4 mi from Charter Oak). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.