Eureka, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a town in Lincoln County, Montana.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Northwest wind around 2 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 2 mph NW | 0% |
| Tonight | 48°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 89°F | Sunny | 2 mph SW | 0% |
| Wednesday Night | 51°F | Mostly Clear | 3 mph SSW | 0% |
| Thursday | 96°F | Sunny | 3 mph S | 0% |
| Thursday Night | 54°F | Mostly Clear | 2 to 6 mph S | 0% |
| Friday | 97°F | Sunny | 1 to 6 mph S | 0% |
| Friday Night | 55°F | Mostly Clear | 3 to 9 mph S | 0% |
| Saturday | 93°F | Sunny | 2 to 6 mph S | 0% |
| Saturday Night | 53°F | Mostly Clear | 2 to 7 mph SSE | 0% |
| Sunday | 90°F | Sunny | 3 mph S | 1% |
| Sunday Night | 52°F | Partly Cloudy | 3 mph SSE | 2% |
| Monday | 88°F | Sunny | 2 mph NNW | 4% |
| Monday Night | 51°F | Mostly Clear | 2 mph S | 2% |
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
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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 Aug 4, 2026.