Castana, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castana, a city in Monona County, Iowa.
Overnight
66°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 69 overnight. Northwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Castana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Slight Chance Showers And Thunderstorms | 6 mph NW | 17% |
| Tuesday | 74°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 to 10 mph N | 74% |
| Tuesday Night | 58°F | Patchy Smoke | 1 to 9 mph NE | 70% |
| Wednesday | 73°F | Patchy Smoke | 5 mph NE | 21% |
| Wednesday Night | 54°F | Mostly Clear | 1 to 5 mph ESE | 2% |
| Thursday | 80°F | Mostly Sunny | 0 to 7 mph SSE | 1% |
| Thursday Night | 62°F | Mostly Clear | 6 mph SSE | 3% |
| Friday | 85°F | Sunny | 3 to 9 mph S | 3% |
| Friday Night | 67°F | Mostly Clear | 5 to 8 mph S | 9% |
| Saturday | 90°F | Sunny | 3 to 14 mph S | 3% |
| Saturday Night | 70°F | Mostly Clear | 9 to 14 mph SSE | 14% |
| Sunday | 90°F | Mostly Sunny | 8 to 12 mph SSE | 11% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 13 mph SSE | 20% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 9 to 14 mph SE | 20% |
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 Aug 4, 2026.