Brockton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brockton, a community in Roosevelt County, Montana.
Tonight
50°F
Chance Rain Showers
A chance of rain showers after 10pm. Cloudy, with a low around 50. East northeast wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
7-day forecast for Brockton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Rain Showers | 14 mph ENE | 39% |
| Sunday | 64°F | Chance Rain Showers then Areas Of Smoke | 13 mph ESE | 41% |
| Sunday Night | 47°F | Partly Cloudy | 8 mph SE | 3% |
| Monday | 71°F | Mostly Sunny | 6 to 14 mph SE | 0% |
| Monday Night | 50°F | Mostly Clear | 13 mph SE | 1% |
| Tuesday | 76°F | Sunny | 12 to 16 mph SSE | 0% |
| Tuesday Night | 52°F | Mostly Clear | 10 to 16 mph SE | 1% |
| Wednesday | 79°F | Mostly Sunny | 9 mph SE | 8% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 7 mph SSE | 8% |
| Thursday | 83°F | Sunny | 3 to 8 mph SSW | 2% |
| Thursday Night | 56°F | Mostly Clear | 5 to 9 mph SE | 4% |
| Friday | 83°F | Mostly Sunny | 9 to 18 mph SE | 2% |
| Friday Night | 54°F | Partly Cloudy | 14 to 18 mph SE | 10% |
| Saturday | 74°F | Mostly Sunny | 12 to 16 mph ENE | 12% |
Forecast source: National Weather Service (api.weather.gov) for Brockton (48.156, -104.903). Updated through the day.
Growing snapshot for Brockton
Last spring frost
May 24
First fall frost
Sep 14
Growing season
110 days
Hardiness zone
4a
More local growing data for Brockton: nearby ZIP 59213 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Wolf Point 29 Ene, Mt (12.9 mi from Brockton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.