Harmon, ND Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harmon, a community in Morton County, North Dakota.
This Afternoon
70°F
Mostly Cloudy
Mostly cloudy. High near 70, with temperatures falling to around 65 in the afternoon. Southeast wind around 13 mph.
7-day forecast for Harmon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Mostly Cloudy | 13 mph SE | 4% |
| Tonight | 53°F | Cloudy then Patchy Fog | 1 to 12 mph E | 3% |
| Saturday | 69°F | Patchy Fog then Slight Chance Rain Showers | 1 to 9 mph NE | 23% |
| Saturday Night | 51°F | Chance Rain Showers | 10 mph NE | 25% |
| Sunday | 63°F | Chance Rain Showers | 10 mph E | 45% |
| Sunday Night | 48°F | Chance Rain Showers | 3 to 8 mph E | 45% |
| Monday | 68°F | Partly Sunny | 2 to 9 mph SE | 11% |
| Monday Night | 47°F | Partly Cloudy | 8 mph SE | 4% |
| Tuesday | 70°F | Partly Sunny | 8 to 18 mph SE | 4% |
| Tuesday Night | 51°F | Mostly Cloudy | 14 mph SE | 11% |
| Wednesday | 75°F | Partly Sunny | 12 to 15 mph SE | 12% |
| Wednesday Night | 52°F | Slight Chance Rain Showers | 5 to 12 mph SE | 19% |
| Thursday | 77°F | Mostly Sunny | 5 to 9 mph SE | 10% |
| Thursday Night | 53°F | Mostly Clear | 7 mph SE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Harmon (46.954, -100.957). Updated through the day.
Growing snapshot for Harmon
Last spring frost
May 13
First fall frost
Sep 27
Growing season
136 days
Hardiness zone
4a
More local growing data for Harmon: nearby ZIP 58554 weather · frost dates · planting calendar · North Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mandan Exp Stn, Nd (4.4 mi from Harmon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.