Castana, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castana, a city in Monona County, Iowa.
Overnight
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy. Low around 68, with temperatures rising to around 71 overnight. West northwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Castana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Showers And Thunderstorms Likely | 5 mph WNW | 74% |
| Saturday | 74°F | Showers And Thunderstorms Likely then Mostly Cloudy | 5 to 9 mph NNW | 62% |
| Saturday Night | 59°F | Slight Chance Rain Showers then Cloudy | 9 mph N | 15% |
| Sunday | 64°F | Cloudy then Chance Rain Showers | 10 mph NE | 33% |
| Sunday Night | 55°F | Chance Rain Showers | 6 to 9 mph NE | 51% |
| Monday | 59°F | Rain Showers Likely | 8 mph ENE | 61% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph ENE | 45% |
| Tuesday | 62°F | Partly Sunny | 3 to 7 mph E | 7% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 2 to 6 mph SE | 3% |
| Wednesday Night | 51°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 30% |
| Thursday | 67°F | Chance Rain Showers | 3 to 7 mph SE | 30% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 15% |
| Friday | 69°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 7 mph SE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Castana (42.073, -95.910). Updated through the day.
Growing snapshot for Castana
Last spring frost
Apr 25
First fall frost
Oct 12
Growing season
170 days
Hardiness zone
5b
More local growing data for Castana: nearby ZIP 51010 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Castana Exp Farm, Ia (5.7 mi from Castana). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.