Lengby, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lengby, a city in Mahnomen County, Minnesota.
Overnight
49°F
Mostly Cloudy
Mostly cloudy, with a low around 49. Northeast wind around 8 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lengby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Cloudy | 8 mph NE | 0% |
| Sunday | 65°F | Mostly Cloudy | 9 mph ENE | 0% |
| Sunday Night | 44°F | Mostly Cloudy | 8 mph E | 0% |
| Monday | 64°F | Mostly Sunny | 7 mph ESE | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph SE | 0% |
| Tuesday | 65°F | Sunny | 9 mph SE | 0% |
| Tuesday Night | 42°F | Clear | 9 mph SE | 0% |
| Wednesday | 66°F | Sunny | 10 to 15 mph SSE | 0% |
| Wednesday Night | 49°F | Partly Cloudy then Slight Chance Rain Showers | 12 mph SSE | 17% |
| Thursday | 67°F | Chance Rain Showers | 10 to 14 mph SSE | 45% |
| Thursday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 7 to 10 mph SSE | 35% |
| Friday | 72°F | Partly Sunny | 7 to 12 mph S | 5% |
| Friday Night | 55°F | Partly Cloudy | 9 to 13 mph SSE | 10% |
| Saturday | 70°F | Chance Rain Showers | 14 to 17 mph SSE | 26% |
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 20, 2026.