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.
Tonight
22°F
Mostly Clear
Mostly clear. Low around 22, with temperatures rising to around 28 overnight. Northwest wind 2 to 10 mph.
7-day forecast for Glen Ullin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 22°F | Mostly Clear | 2 to 10 mph NW | 0% |
| Wednesday | 51°F | Mostly Sunny | 3 to 12 mph NW | 0% |
| Wednesday Night | 22°F | Partly Cloudy | 1 to 8 mph NW | 0% |
| Thursday | 48°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Thursday Night | 22°F | Partly Cloudy | 5 mph S | 0% |
| Friday | 55°F | Mostly Sunny | 2 to 7 mph W | 0% |
| Friday Night | 29°F | Mostly Clear | 3 to 7 mph SW | 2% |
| Saturday | 57°F | Mostly Sunny | 8 to 20 mph W | 2% |
| Saturday Night | 27°F | Mostly Clear | 1 to 10 mph W | 0% |
| Sunday | 62°F | Sunny | 1 to 10 mph SW | 0% |
| Sunday Night | 37°F | Mostly Clear | 9 to 13 mph SW | 0% |
| Monday | 59°F | Sunny | 9 to 17 mph NW | 0% |
| Monday Night | 29°F | Partly Cloudy | 2 to 7 mph W | 0% |
| Tuesday | 58°F | Mostly Sunny | 2 to 10 mph W | 1% |
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 Nov 4, 2026.