Walnut, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a city in Pottawattamie County, Iowa.
This Afternoon
49°F
Mostly Cloudy
Mostly cloudy. High near 49, with temperatures falling to around 46 in the afternoon. West wind around 16 mph, with gusts as high as 23 mph.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Mostly Cloudy | 16 mph W | 8% |
| Tonight | 40°F | Cloudy then Slight Chance Rain Showers | 13 mph WNW | 25% |
| Thursday | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 14 mph NNW | 18% |
| Thursday Night | 35°F | Mostly Cloudy | 5 to 10 mph N | 2% |
| Friday | 48°F | Mostly Sunny | 1 to 6 mph NNE | 3% |
| Friday Night | 29°F | Partly Cloudy | 2 mph SSE | 0% |
| Saturday | 53°F | Mostly Sunny | 2 to 7 mph SSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph SW | 0% |
| Sunday | 59°F | Sunny | 5 mph WSW | 0% |
| Sunday Night | 38°F | Clear | 2 to 7 mph SSW | 0% |
| Monday | 65°F | Sunny | 7 to 10 mph SSW | 0% |
| Monday Night | 40°F | Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 62°F | Sunny | 5 mph NNE | 1% |
| Tuesday Night | 42°F | Partly Cloudy | 3 mph ENE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Walnut (41.489, -95.220). Updated through the day.
Growing snapshot for Walnut
Last spring frost
Apr 30
First fall frost
Oct 2
Growing season
153 days
Hardiness zone
5a
More local growing data for Walnut: nearby ZIP 51577 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Avoca
Bentley
Carson
Carter Lake
Council Bluffs
Crescent
Hancock
Macedonia
McClelland
Minden
Neola
Oakland
Treynor
Underwood
Weston
Climate data from the nearest NOAA station, Atlantic 1 Ne, Ia (10.8 mi from Walnut). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.