Larchwood, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Larchwood, a city in Lyon County, Iowa.
Overnight
39°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 39, with temperatures rising to around 42 overnight. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Larchwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Chance Rain Showers | 15 mph NW | 42% |
| Wednesday | 46°F | Rain Showers Likely | 15 mph NW | 68% |
| Wednesday Night | 37°F | Chance Rain Showers | 10 to 15 mph NW | 43% |
| Thursday | 45°F | Mostly Cloudy | 10 to 15 mph NNW | 2% |
| Thursday Night | 31°F | Mostly Cloudy | 0 to 10 mph N | 0% |
| Friday | 45°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 29°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph SSW | 1% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 mph WSW | 0% |
| Sunday Night | 37°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 57°F | Mostly Sunny | 0 to 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Larchwood (43.455, -96.436). Updated through the day.
Growing snapshot for Larchwood
Last spring frost
May 2
First fall frost
Oct 2
Growing season
151 days
Hardiness zone
5a
More local growing data for Larchwood: nearby ZIP 51241 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Canton, Sd (11.6 mi from Larchwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.