Harlem, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlem, a city in Blaine County, Montana.
This Afternoon
46°F
Patchy Fog
Patchy fog after 5pm. Sunny. High near 46, with temperatures falling to around 42 in the afternoon. West wind around 5 mph.
7-day forecast for Harlem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Patchy Fog | 5 mph W | 0% |
| Tonight | 30°F | Areas Of Fog | 1 to 6 mph ENE | 0% |
| Thursday | 52°F | Areas Of Fog then Mostly Sunny | 6 mph SSW | 0% |
| Thursday Night | 34°F | Partly Cloudy | 6 to 12 mph W | 0% |
| Friday | 54°F | Sunny | 5 to 8 mph WSW | 0% |
| Friday Night | 39°F | Partly Cloudy | 5 to 17 mph WSW | 0% |
| Saturday | 59°F | Sunny | 3 to 17 mph WNW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 6 mph SSE | 0% |
| Sunday | 64°F | Partly Sunny | 3 to 14 mph SSW | 0% |
| Sunday Night | 39°F | Partly Cloudy | 9 to 21 mph W | 0% |
| Monday | 55°F | Mostly Sunny | 6 to 9 mph W | 1% |
| Monday Night | 35°F | Mostly Cloudy | 6 mph S | 1% |
| Tuesday | 59°F | Mostly Sunny | 3 to 8 mph SSW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 6 mph WSW | 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 Nov 5, 2026.