Lewistown, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a city in Fergus County, Montana.
This Afternoon
73°F
Partly Sunny
Partly sunny, with a high near 73. North wind around 8 mph.
7-day forecast for Lewistown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Partly Sunny | 8 mph N | 14% |
| Tonight | 50°F | Chance Showers And Thunderstorms then Rain Likely | 3 to 7 mph ENE | 72% |
| Saturday | 58°F | Rain Likely then Showers And Thunderstorms Likely | 7 mph NE | 74% |
| Saturday Night | 48°F | Rain | 2 to 7 mph NE | 75% |
| Sunday | 65°F | Chance Light Rain | 3 mph NE | 42% |
| Sunday Night | 45°F | Partly Cloudy | 5 to 8 mph ESE | 2% |
| Monday | 75°F | Sunny | 2 to 6 mph S | 0% |
| Monday Night | 49°F | Mostly Clear | 2 to 9 mph S | 0% |
| Tuesday | 77°F | Mostly Sunny | 3 mph WSW | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 to 7 mph SE | 3% |
| Wednesday | 77°F | Sunny | 5 mph SW | 2% |
| Wednesday Night | 49°F | Mostly Clear | 6 mph SE | 1% |
| Thursday | 79°F | Sunny | 5 mph S | 1% |
| Thursday Night | 51°F | Partly Cloudy | 6 to 9 mph S | 4% |
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 Sep 19, 2026.