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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
54°F
Cloudy then Patchy Fog
Patchy fog after 1am. Cloudy, with a low around 54. Southeast wind 0 to 6 mph.

7-day forecast for Glen Ullin

WhenTempForecastWindPrecip
Tonight 54°F Cloudy then Patchy Fog 0 to 6 mph SE 2%
Saturday 66°F Patchy Fog then Chance Rain Showers 0 to 10 mph E 40%
Saturday Night 48°F Chance Rain Showers 10 mph E 50%
Sunday 61°F Rain Showers Likely 12 mph E 57%
Sunday Night 46°F Rain Showers Likely 2 to 9 mph E 57%
Monday 67°F Partly Sunny 2 to 12 mph SE 11%
Monday Night 46°F Mostly Cloudy 10 mph SE 7%
Tuesday 70°F Partly Sunny 9 to 21 mph SE 4%
Tuesday Night 49°F Mostly Cloudy 13 to 17 mph SE 7%
Wednesday 76°F Partly Sunny 12 to 15 mph SE 12%
Wednesday Night 51°F Slight Chance Rain Showers 2 to 12 mph SE 15%
Thursday 79°F Mostly Sunny 2 to 9 mph SE 6%
Thursday Night 52°F Mostly Clear 8 mph SE 5%
Friday 78°F Mostly Sunny 7 to 17 mph SE 4%

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

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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 Sep 19, 2026.