Lewistown, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a city in Fergus County, Montana.
Overnight
39°F
Mostly Clear
Mostly clear. Low around 39, with temperatures rising to around 43 overnight. South wind around 5 mph.
7-day forecast for Lewistown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 72°F | Sunny | 1 to 5 mph NNW | 0% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph SE | 2% |
| Wednesday | 81°F | Sunny | 5 to 9 mph W | 0% |
| Wednesday Night | 50°F | Mostly Clear | 3 to 7 mph SE | 0% |
| Thursday | 87°F | Sunny | 5 to 10 mph W | 0% |
| Thursday Night | 54°F | Mostly Clear | 3 to 10 mph ESE | 0% |
| Friday | 91°F | Sunny | 3 to 14 mph WSW | 1% |
| Friday Night | 56°F | Mostly Clear | 6 to 10 mph W | 1% |
| Saturday | 89°F | Sunny | 6 to 12 mph WNW | 0% |
| Saturday Night | 57°F | Mostly Clear | 8 mph E | 3% |
| Sunday | 86°F | Sunny | 5 to 10 mph NW | 1% |
| Sunday Night | 55°F | Partly Cloudy | 6 to 9 mph E | 8% |
| Monday | 84°F | Sunny | 3 to 10 mph ENE | 13% |
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 Aug 4, 2026.