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
74°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly sunny. High near 74, with temperatures falling to around 72 in the afternoon. North northeast wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Charter Oak
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Showers And Thunderstorms Likely | 9 mph NNE | 71% |
| Tonight | 57°F | Chance Showers And Thunderstorms | 3 to 8 mph NE | 51% |
| Wednesday | 72°F | Chance Showers And Thunderstorms | 6 mph ENE | 29% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 3 mph ESE | 2% |
| Thursday | 79°F | Sunny | 0 to 6 mph SE | 1% |
| Thursday Night | 61°F | Mostly Clear | 6 mph SSE | 3% |
| Friday | 84°F | Sunny | 3 to 8 mph S | 3% |
| Friday Night | 66°F | Mostly Clear | 7 mph S | 10% |
| Saturday | 89°F | Sunny | 3 to 13 mph S | 3% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph S | 15% |
| Sunday | 89°F | Mostly Sunny | 10 mph SSE | 12% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 12 mph SSE | 25% |
| Monday | 89°F | Chance Showers And Thunderstorms then Partly Sunny | 13 mph SSE | 25% |
| Monday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 9 to 14 mph ESE | 19% |
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 Aug 4, 2026.