Lengby, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lengby, a city in Mahnomen County, Minnesota.
Today
68°F
Mostly Cloudy
Mostly cloudy, with a high near 68. East northeast wind 5 to 9 mph.
7-day forecast for Lengby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Mostly Cloudy | 5 to 9 mph ENE | 3% |
| Tonight | 48°F | Mostly Cloudy | 7 to 10 mph NE | 11% |
| Sunday | 64°F | Partly Sunny | 9 mph ENE | 0% |
| Sunday Night | 42°F | Mostly Cloudy | 8 mph E | 0% |
| Monday | 65°F | Sunny | 8 mph ESE | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph SE | 1% |
| Tuesday | 65°F | Sunny | 10 mph SSE | 1% |
| Tuesday Night | 43°F | Mostly Clear | 10 mph SSE | 0% |
| Wednesday | 66°F | Sunny | 10 to 14 mph SSE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 10 mph SSE | 11% |
| Thursday | 68°F | Partly Sunny | 12 mph SSE | 11% |
| Thursday Night | 50°F | Partly Cloudy | 9 mph SSE | 10% |
| Friday | 71°F | Mostly Sunny | 8 to 13 mph SSE | 6% |
| Friday Night | 53°F | Partly Cloudy | 10 to 14 mph SSE | 13% |
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 Sep 19, 2026.