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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.

Overnight
54°F
Patchy Drizzle
Patchy drizzle and patchy fog. Cloudy, with a low around 54. Northeast wind 0 to 5 mph.

7-day forecast for Glen Ullin

WhenTempForecastWindPrecip
Overnight 54°F Patchy Drizzle 0 to 5 mph NE 10%
Saturday 66°F Patchy Fog then Chance Rain Showers 0 to 9 mph NE 39%
Saturday Night 48°F Rain Showers Likely 12 mph E 64%
Sunday 61°F Rain Showers Likely 12 mph E 65%
Sunday Night 45°F Chance Rain Showers 2 to 8 mph E 32%
Monday 68°F Mostly Sunny 1 to 12 mph SE 6%
Monday Night 45°F Partly Cloudy 10 mph SE 1%
Tuesday 70°F Mostly Sunny 10 to 22 mph SE 2%
Tuesday Night 49°F Mostly Cloudy 13 to 18 mph SE 4%
Wednesday 76°F Mostly Sunny 13 to 17 mph SE 8%
Wednesday Night 51°F Partly Cloudy 3 to 14 mph SE 13%
Thursday 78°F Mostly Sunny 3 to 10 mph SE 10%
Thursday Night 52°F Partly Cloudy 9 mph SE 10%
Friday 79°F Mostly Sunny 8 to 20 mph SE 5%

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.