Harlem, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlem, a city in Blaine County, Montana.
Tonight
51°F
Mostly Cloudy
Mostly cloudy, with a low around 51. Northeast wind 6 to 10 mph.
7-day forecast for Harlem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Cloudy | 6 to 10 mph NE | 2% |
| Saturday | 70°F | Cloudy | 6 to 13 mph ENE | 9% |
| Saturday Night | 50°F | Cloudy | 6 to 9 mph E | 8% |
| Sunday | 69°F | Mostly Cloudy | 6 to 12 mph ESE | 4% |
| Sunday Night | 48°F | Partly Cloudy | 9 to 13 mph SE | 0% |
| Monday | 75°F | Mostly Sunny | 9 to 14 mph SE | 0% |
| Monday Night | 50°F | Mostly Clear | 7 to 14 mph SE | 0% |
| Tuesday | 79°F | Sunny | 6 mph SSW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 5 mph E | 1% |
| Wednesday | 79°F | Sunny | 3 to 9 mph S | 2% |
| Wednesday Night | 50°F | Mostly Clear | 6 mph ESE | 2% |
| Thursday | 80°F | Sunny | 5 to 9 mph SE | 0% |
| Thursday Night | 51°F | Partly Cloudy | 9 mph ESE | 1% |
| Friday | 80°F | Mostly Sunny | 10 mph SE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Harlem (48.532, -108.785). Updated through the day.
Growing snapshot for Harlem
Last spring frost
May 16
First fall frost
Sep 22
Growing season
128 days
Hardiness zone
4a
More local growing data for Harlem: nearby ZIP 59526 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ft Belknap 2 Sw, Mt (3.6 mi from Harlem). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.