Lengby, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lengby, a city in Mahnomen County, Minnesota.
This Afternoon
47°F
Chance Light Rain
A chance of rain before 3pm. Cloudy, with a high near 47. North wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lengby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Chance Light Rain | 17 mph N | 30% |
| Tonight | 31°F | Mostly Cloudy | 13 to 17 mph N | 1% |
| Thursday | 40°F | Mostly Cloudy | 7 to 16 mph N | 0% |
| Thursday Night | 22°F | Partly Cloudy | 2 to 6 mph E | 0% |
| Friday | 42°F | Mostly Sunny | 3 to 8 mph S | 0% |
| Friday Night | 27°F | Partly Cloudy | 9 mph SSW | 0% |
| Saturday | 50°F | Mostly Sunny | 9 to 14 mph SW | 2% |
| Saturday Night | 31°F | Partly Cloudy | 5 to 12 mph WSW | 2% |
| Sunday | 51°F | Sunny | 5 to 9 mph WSW | 1% |
| Sunday Night | 36°F | Partly Cloudy | 7 to 12 mph SSW | 0% |
| Monday | 56°F | Mostly Sunny | 14 mph WSW | 0% |
| Monday Night | 32°F | Mostly Clear | 6 to 10 mph WNW | 1% |
| Tuesday | 50°F | Mostly Sunny | 8 mph W | 2% |
| Tuesday Night | 31°F | Partly Cloudy | 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Lengby (47.515, -95.635). Updated through the day.
Growing snapshot for Lengby
Last spring frost
May 15
First fall frost
Sep 26
Growing season
132 days
Hardiness zone
3b
More local growing data for Lengby: nearby ZIP 56651 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Beaulieu
Bejou
Ebro
Elbow Lake
Mahnomen
Midway
Naytahwaush
Pine Bend
Riverland
Roy Lake
The Ranch
Twin Lakes
West Roy Lake
Climate data from the nearest NOAA station, Fosston 1 E, Mn (9.1 mi from Lengby). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.