Lewistown, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a city in Fergus County, Montana.
Tonight
30°F
Partly Cloudy
Partly cloudy, with a low around 30. South wind 1 to 5 mph.
7-day forecast for Lewistown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Partly Cloudy | 1 to 5 mph S | 0% |
| Wednesday | 46°F | Mostly Sunny | 2 mph W | 0% |
| Wednesday Night | 29°F | Mostly Clear | 0 to 6 mph S | 0% |
| Thursday | 54°F | Sunny | 0 to 6 mph WSW | 1% |
| Thursday Night | 31°F | Partly Cloudy | 0 to 8 mph WSW | 2% |
| Friday | 52°F | Sunny | 8 to 13 mph SW | 4% |
| Friday Night | 34°F | Partly Cloudy | 10 to 17 mph WSW | 8% |
| Saturday | 51°F | Sunny | 3 to 15 mph WSW | 2% |
| Saturday Night | 35°F | Partly Cloudy | 3 to 10 mph SSW | 0% |
| Sunday | 62°F | Mostly Sunny | 10 mph SW | 1% |
| Sunday Night | 37°F | Partly Cloudy | 3 to 9 mph WSW | 1% |
| Monday | 55°F | Partly Sunny | 5 mph WSW | 2% |
| Monday Night | 36°F | Mostly Cloudy | 7 mph S | 2% |
| Tuesday | 59°F | Mostly Sunny | 7 to 10 mph SW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Lewistown (47.051, -109.452). Updated through the day.
Growing snapshot for Lewistown
Last spring frost
May 14
First fall frost
Sep 28
Growing season
135 days
Hardiness zone
4b
More local growing data for Lewistown: nearby ZIP 59457 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Ayers Ranch Colony
Brooks
Coffee Creek
Deerfield Colony
Denton
Fords Creek Colony
Grass Range
Hilger
King Ranch Colony
Lewistown Heights
Moore
Roy
Warm Spring Creek
Winifred
Climate data from the nearest NOAA station, Lewistown, Mt (6.7 mi from Lewistown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.