Lengby, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lengby, a city in Mahnomen County, Minnesota.
Today
70°F
Sunny
Sunny, with a high near 70. West northwest wind 9 to 13 mph.
7-day forecast for Lengby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Sunny | 9 to 13 mph WNW | 0% |
| Tonight | 49°F | Mostly Clear | 3 to 12 mph SW | 0% |
| Wednesday | 77°F | Sunny | 6 to 12 mph SW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 12 mph SW | 14% |
| Thursday | 81°F | Sunny | 13 mph SW | 14% |
| Thursday Night | 59°F | Mostly Clear | 6 to 12 mph SW | 5% |
| Friday | 80°F | Sunny | 7 to 12 mph W | 7% |
| Friday Night | 55°F | Mostly Clear | 3 to 13 mph NNE | 8% |
| Saturday | 78°F | Mostly Sunny | 5 to 10 mph NE | 11% |
| Saturday Night | 56°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 21% |
| Sunday | 76°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 9 mph N | 18% |
| Sunday Night | 56°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 9 mph NE | 20% |
| Monday | 76°F | Slight Chance Rain Showers | 8 mph NNE | 20% |
| Monday Night | 56°F | Slight Chance Rain Showers | 5 to 9 mph NE | 16% |
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 Aug 4, 2026.