Brockton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brockton, a community in Roosevelt County, Montana.
Tonight
55°F
Slight Chance Rain Showers
A slight chance of rain showers after 9pm. Mostly cloudy, with a low around 55. Northeast wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast for Brockton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Slight Chance Rain Showers | 9 to 14 mph NE | 22% |
| Saturday | 68°F | Chance Rain Showers | 13 to 16 mph NE | 29% |
| Saturday Night | 51°F | Chance Rain Showers | 13 mph E | 47% |
| Sunday | 64°F | Rain Showers Likely | 13 mph E | 57% |
| Sunday Night | 47°F | Mostly Cloudy | 8 to 12 mph ESE | 5% |
| Monday | 71°F | Mostly Sunny | 7 to 15 mph SE | 3% |
| Monday Night | 50°F | Partly Cloudy | 12 to 15 mph SE | 1% |
| Tuesday | 78°F | Sunny | 13 mph SE | 0% |
| Tuesday Night | 53°F | Partly Cloudy | 7 to 14 mph SE | 3% |
| Wednesday | 80°F | Sunny | 8 mph SSE | 6% |
| Wednesday Night | 53°F | Mostly Clear | 6 mph SE | 5% |
| Thursday | 82°F | Sunny | 3 to 9 mph SE | 2% |
| Thursday Night | 54°F | Mostly Clear | 10 mph ESE | 2% |
| Friday | 81°F | Mostly Sunny | 7 to 14 mph SE | 3% |
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 19, 2026.