Castana, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castana, a city in Monona County, Iowa.
This Afternoon
57°F
Rain Showers
Rain showers. Cloudy. High near 57, with temperatures falling to around 52 in the afternoon. North northwest wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Castana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Rain Showers | 17 mph NNW | 85% |
| Tonight | 39°F | Rain Showers | 15 mph NW | 94% |
| Wednesday | 49°F | Chance Rain Showers | 12 to 15 mph WNW | 43% |
| Wednesday Night | 37°F | Cloudy then Chance Rain Showers | 10 mph WNW | 47% |
| Thursday | 50°F | Chance Rain Showers | 8 to 12 mph NNW | 36% |
| Thursday Night | 34°F | Mostly Cloudy | 2 to 7 mph N | 2% |
| Friday | 51°F | Partly Sunny | 2 mph N | 0% |
| Friday Night | 32°F | Partly Cloudy | 1 mph SE | 0% |
| Saturday | 58°F | Mostly Sunny | 1 to 5 mph SW | 3% |
| Saturday Night | 34°F | Mostly Clear | 3 mph W | 5% |
| Sunday | 61°F | Sunny | 2 to 6 mph WSW | 3% |
| Sunday Night | 38°F | Mostly Clear | 6 mph S | 0% |
| Monday | 64°F | Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph NNW | 0% |
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 Nov 3, 2026.