Brockton, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brockton, a community in Roosevelt County, Montana.
Overnight
41°F
Partly Cloudy
Partly cloudy, with a low around 41. West southwest wind around 8 mph.
7-day forecast for Brockton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Partly Cloudy | 8 mph WSW | 0% |
| Tuesday | 74°F | Sunny | 8 to 16 mph W | 0% |
| Tuesday Night | 49°F | Mostly Clear | 5 to 13 mph WSW | 1% |
| Wednesday | 84°F | Partly Sunny | 9 to 16 mph WSW | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 14 mph WSW | 0% |
| Thursday | 89°F | Sunny | 5 to 12 mph W | 0% |
| Thursday Night | 55°F | Mostly Clear | 7 to 10 mph N | 0% |
| Friday | 87°F | Sunny | 8 mph ENE | 0% |
| Friday Night | 57°F | Mostly Clear | 8 to 12 mph NE | 1% |
| Saturday | 89°F | Sunny | 12 mph ENE | 0% |
| Saturday Night | 57°F | Partly Cloudy | 10 to 14 mph ENE | 2% |
| Sunday | 88°F | Partly Sunny | 10 to 15 mph ENE | 2% |
| Sunday Night | 57°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 12 to 15 mph NE | 17% |
| Monday | 84°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 12 to 15 mph ENE | 20% |
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 Aug 4, 2026.