Le Mars, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Le Mars, a city in Plymouth County, Iowa.
Overnight
63°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 63. North wind around 15 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Le Mars
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Chance Rain Showers | 15 mph N | 51% |
| Tuesday | 73°F | Patchy Smoke | 5 to 10 mph N | 63% |
| Tuesday Night | 55°F | Patchy Smoke then Mostly Cloudy | 0 to 5 mph N | 66% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph E | 2% |
| Wednesday Night | 53°F | Mostly Clear | 0 mph | 1% |
| Thursday | 82°F | Mostly Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 62°F | Mostly Clear | 5 to 10 mph S | 1% |
| Friday | 87°F | Sunny | 5 to 10 mph S | 4% |
| Friday Night | 66°F | Mostly Clear | 5 to 10 mph S | 12% |
| Saturday | 91°F | Sunny | 5 to 15 mph S | 5% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SSE | 17% |
| Sunday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SE | 15% |
| Sunday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph ESE | 16% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph E | 16% |
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 Aug 4, 2026.