Le Mars, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Le Mars, a city in Plymouth County, Iowa.
Tonight
39°F
Rain Showers
Rain showers. Cloudy. Low around 39, with temperatures rising to around 43 overnight. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Le Mars
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Rain Showers | 15 mph NW | 95% |
| Wednesday | 48°F | Rain Showers Likely | 15 mph WNW | 58% |
| Wednesday Night | 38°F | Chance Rain Showers | 10 to 15 mph NW | 54% |
| Thursday | 49°F | Chance Rain Showers | 10 to 15 mph NNW | 26% |
| Thursday Night | 33°F | Mostly Cloudy | 0 to 10 mph N | 0% |
| Friday | 49°F | Partly Sunny | 0 mph | 0% |
| Friday Night | 32°F | Mostly Cloudy | 0 mph | 0% |
| Saturday | 57°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 5% |
| Sunday | 60°F | Sunny | 0 to 5 mph WSW | 3% |
| Sunday Night | 38°F | Mostly Clear | 5 mph S | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 60°F | Mostly Sunny | 0 to 5 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Le Mars (42.782, -96.173). Updated through the day.
Growing snapshot for Le Mars
Last spring frost
Apr 30
First fall frost
Oct 4
Growing season
157 days
Hardiness zone
5a
More local growing data for Le Mars: nearby ZIP 51031 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Le Mars, Ia (2.5 mi from Le Mars). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.