Glen Ullin, ND Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Glen Ullin, a city in Morton County, North Dakota.
Today
75°F
Sunny
Sunny. High near 75, with temperatures falling to around 73 in the afternoon. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.
7-day forecast for Glen Ullin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 10 to 15 mph NW | 0% |
| Tonight | 46°F | Mostly Clear | 0 to 13 mph W | 0% |
| Wednesday | 83°F | Mostly Sunny | 3 to 12 mph W | 0% |
| Wednesday Night | 51°F | Mostly Clear | 2 to 10 mph SW | 1% |
| Thursday | 89°F | Sunny | 2 to 9 mph W | 0% |
| Thursday Night | 55°F | Mostly Clear | 2 to 10 mph E | 0% |
| Friday | 88°F | Sunny | 5 to 10 mph N | 0% |
| Friday Night | 55°F | Mostly Clear | 5 to 8 mph E | 0% |
| Saturday | 91°F | Sunny | 5 to 10 mph NE | 0% |
| Saturday Night | 55°F | Mostly Clear | 5 to 12 mph NE | 2% |
| Sunday | 89°F | Mostly Sunny | 5 to 14 mph E | 12% |
| Sunday Night | 56°F | Chance Showers And Thunderstorms | 9 to 13 mph E | 33% |
| Monday | 85°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 33% |
| Monday Night | 55°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 13 mph E | 33% |
Forecast source: National Weather Service (api.weather.gov) for Glen Ullin (46.812, -101.833). Updated through the day.
Growing snapshot for Glen Ullin
Last spring frost
May 19
First fall frost
Sep 21
Growing season
123 days
Hardiness zone
4a
More local growing data for Glen Ullin: nearby ZIP 58631 weather · frost dates · planting calendar · North Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hebron, Nd (12.1 mi from Glen Ullin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.