Walnut, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a city in Pottawattamie County, Iowa.
Overnight
42°F
Cloudy
Cloudy. Low around 42, with temperatures rising to around 44 overnight. Northwest wind around 17 mph, with gusts as high as 26 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Cloudy | 17 mph NW | 11% |
| Wednesday | 49°F | Chance Rain Showers | 14 to 17 mph WNW | 30% |
| Wednesday Night | 40°F | Mostly Cloudy then Chance Rain Showers | 13 mph WNW | 29% |
| Thursday | 50°F | Chance Rain Showers then Mostly Cloudy | 13 mph NW | 28% |
| Thursday Night | 37°F | Mostly Cloudy | 5 to 9 mph N | 1% |
| Friday | 50°F | Mostly Sunny | 5 mph NNE | 1% |
| Friday Night | 31°F | Partly Cloudy | 2 mph ESE | 0% |
| Saturday | 52°F | Mostly Sunny | 2 to 6 mph SSW | 0% |
| Saturday Night | 36°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 58°F | Sunny | 3 to 7 mph WSW | 0% |
| Sunday Night | 39°F | Clear | 5 mph SSW | 0% |
| Monday | 63°F | Sunny | 6 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 63°F | Mostly Sunny | 6 mph NNW | 0% |
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.