Lost River, ID Weather & Growing Conditions
This Afternoon
37°F
Mostly Cloudy
Mostly cloudy. High near 37, with temperatures falling to around 33 in the afternoon. South southeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 37°F | Mostly Cloudy | 6 mph SSE | 0% |
| Tonight | 29°F | Cloudy | 3 to 9 mph NE | 1% |
| Wednesday | 43°F | Partly Sunny | 2 to 9 mph WSW | 1% |
| Wednesday Night | 26°F | Mostly Clear | 5 mph WNW | 0% |
| Thursday | 37°F | Areas Of Fog then Partly Sunny | 3 to 7 mph SW | 3% |
| Thursday Night | 24°F | Patchy Fog | 6 mph W | 3% |
| Friday | 37°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Friday Night | 26°F | Partly Cloudy | 0 to 5 mph WNW | 0% |
| Saturday | 41°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Saturday Night | 28°F | Partly Cloudy | 3 mph WNW | 0% |
| Sunday | 44°F | Mostly Sunny | 1 to 8 mph SW | 0% |
| Sunday Night | 30°F | Partly Cloudy | 1 to 5 mph W | 0% |
| Monday | 45°F | Partly Sunny | 3 mph SSE | 0% |
| Monday Night | 31°F | Partly Cloudy | 3 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lost River, ID
Last spring frost
May 22
First fall frost
Sep 22
Growing season
119 days
Hardiness zone
5a
Explore more for Lost River, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Arco, Id (9.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.