Eureka, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a town in Lincoln County, Montana.
This Afternoon
78°F
Mostly Sunny
Mostly sunny, with a high near 78. West northwest wind around 3 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Mostly Sunny | 3 mph WNW | 0% |
| Tonight | 48°F | Mostly Clear | 2 mph SW | 2% |
| Saturday | 79°F | Sunny | 2 mph N | 3% |
| Saturday Night | 47°F | Partly Cloudy | 2 mph SE | 0% |
| Sunday | 80°F | Sunny | 2 mph S | 0% |
| Sunday Night | 49°F | Clear | 3 mph SSE | 0% |
| Monday | 80°F | Sunny | 2 mph S | 0% |
| Monday Night | 50°F | Mostly Clear | 3 mph S | 0% |
| Tuesday | 78°F | Mostly Sunny | 2 mph S | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 mph S | 1% |
| Wednesday | 74°F | Mostly Sunny | 5 mph SSW | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 3 mph S | 1% |
| Thursday | 77°F | Mostly Sunny | 2 mph SSE | 1% |
| Thursday Night | 50°F | Partly Cloudy | 2 mph SSE | 4% |
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
Pioneer Junction
Rexford
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 Sep 19, 2026.