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
47°F
Mostly Cloudy
Mostly cloudy. High near 47, with temperatures falling to around 44 in the afternoon. Northwest wind 9 to 15 mph, with gusts as high as 24 mph.
7-day forecast for Harmon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Mostly Cloudy | 9 to 15 mph NW | 0% |
| Tonight | 26°F | Partly Cloudy | 3 to 7 mph NW | 0% |
| Wednesday | 51°F | Partly Sunny | 6 to 13 mph NW | 0% |
| Wednesday Night | 26°F | Partly Cloudy | 3 to 8 mph NW | 0% |
| Thursday | 44°F | Mostly Sunny | 5 mph NE | 0% |
| Thursday Night | 23°F | Partly Cloudy | 3 mph SE | 0% |
| Friday | 52°F | Mostly Sunny | 3 to 7 mph SW | 0% |
| Friday Night | 30°F | Mostly Clear | 5 mph SW | 1% |
| Saturday | 58°F | Mostly Sunny | 6 to 16 mph W | 3% |
| Saturday Night | 30°F | Mostly Clear | 2 to 9 mph W | 1% |
| Sunday | 61°F | Sunny | 2 to 10 mph SW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 8 to 12 mph SW | 0% |
| Monday | 59°F | Sunny | 9 to 17 mph W | 0% |
| Monday Night | 31°F | Partly Cloudy | 3 to 7 mph W | 0% |
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 Nov 4, 2026.