Eureka, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a town in Lincoln County, Montana.
This Afternoon
46°F
Partly Sunny
Partly sunny, with a high near 46. Wind around 0 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Partly Sunny | 0 mph | 1% |
| Tonight | 28°F | Mostly Cloudy | 1 mph NNE | 3% |
| Wednesday | 49°F | Mostly Sunny | 1 mph N | 0% |
| Wednesday Night | 27°F | Partly Cloudy | 3 mph SE | 4% |
| Thursday | 47°F | Mostly Cloudy then Slight Chance Light Rain | 3 mph S | 18% |
| Thursday Night | 32°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph S | 18% |
| Friday | 47°F | Slight Chance Light Rain | 5 mph SSE | 24% |
| Friday Night | 30°F | Slight Chance Light Rain then Mostly Cloudy | 6 mph SSE | 22% |
| Saturday | 50°F | Partly Sunny | 3 mph SSE | 7% |
| Saturday Night | 34°F | Mostly Cloudy then Chance Light Rain | 2 to 6 mph SSE | 28% |
| Sunday | 54°F | Chance Light Rain | 6 mph S | 30% |
| Sunday Night | 34°F | Slight Chance Light Rain | 5 mph S | 21% |
| Monday | 50°F | Slight Chance Light Rain | 2 mph SSE | 16% |
| Monday Night | 34°F | Chance Rain And Snow | 5 mph SSE | 25% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (48.879, -115.049). Updated through the day.
Growing snapshot for Eureka
Last spring frost
May 11
First fall frost
Sep 27
Growing season
138 days
Hardiness zone
5b
More local growing data for Eureka: nearby ZIP 59930 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Fortine
Happys Inn
Indian Springs
Libby
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Stryker
Sylvanite
Trego
Troy
West Kootenai
White Haven
Yaak
Climate data from the nearest NOAA station, Eureka Rs, Mt (3.8 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.