Harlowton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlowton, a city in Wheatland County, Montana.
Today
59°F
Showers And Thunderstorms
Rain showers before 9am, then showers and thunderstorms. Cloudy. High near 59, with temperatures falling to around 56 in the afternoon. North northwest wind 9 to 13 mph. Chance of precipitation is 100%.
7-day forecast for Harlowton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Showers And Thunderstorms | 9 to 13 mph NNW | 100% |
| Tonight | 46°F | Rain Showers | 7 to 10 mph NNW | 86% |
| Sunday | 65°F | Rain Showers Likely then Mostly Cloudy | 3 to 8 mph N | 59% |
| Sunday Night | 44°F | Mostly Cloudy | 3 to 9 mph SSE | 5% |
| Monday | 73°F | Mostly Sunny | 3 to 7 mph S | 0% |
| Monday Night | 45°F | Mostly Clear | 3 to 10 mph SW | 0% |
| Tuesday | 77°F | Sunny | 3 to 9 mph WSW | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 2 to 6 mph WSW | 1% |
| Wednesday | 78°F | Sunny | 2 to 9 mph WSW | 4% |
| Wednesday Night | 47°F | Mostly Clear | 7 mph SW | 6% |
| Thursday | 79°F | Sunny | 3 to 8 mph WSW | 1% |
| Thursday Night | 47°F | Mostly Clear | 5 to 9 mph SE | 2% |
| Friday | 78°F | Mostly Sunny | 5 to 10 mph SSW | 4% |
| Friday Night | 47°F | Slight Chance Rain Showers | 10 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Harlowton (46.437, -109.835). Updated through the day.
Growing snapshot for Harlowton
Last spring frost
May 23
First fall frost
Sep 16
Growing season
113 days
Hardiness zone
4b
More local growing data for Harlowton: nearby ZIP 59036 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Harlowton, Mt (2.6 mi from Harlowton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.