Lost River, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lost River, a city in Butte County, Idaho.
Overnight
29°F
Cloudy
Cloudy. Low around 29, with temperatures rising to around 31 overnight. North northwest wind around 3 mph.
7-day forecast for Lost River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Cloudy | 3 mph NNW | 1% |
| Wednesday | 51°F | Partly Sunny | 2 to 7 mph WSW | 1% |
| Wednesday Night | 27°F | Mostly Clear | 1 to 5 mph W | 1% |
| Thursday | 46°F | Partly Sunny | 1 to 7 mph SW | 7% |
| Thursday Night | 25°F | Areas Of Fog | 5 mph WNW | 7% |
| Friday | 46°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Friday Night | 28°F | Partly Cloudy | 0 to 3 mph WNW | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph SE | 0% |
| Saturday Night | 30°F | Partly Cloudy | 2 mph WNW | 0% |
| Sunday | 54°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Sunday Night | 32°F | Partly Cloudy | 5 mph W | 0% |
| Monday | 54°F | Mostly Sunny | 1 to 5 mph SW | 0% |
| Monday Night | 32°F | Mostly Cloudy | 3 mph W | 0% |
| Tuesday | 54°F | Mostly Sunny | 1 to 5 mph WSW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Lost River (43.688, -113.635). Updated through the day.
Growing snapshot for Lost River
Last spring frost
May 22
First fall frost
Sep 22
Growing season
119 days
Hardiness zone
5a
More local growing data for Lost River: nearby ZIP 83255 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Arco, Id (9.6 mi from Lost River). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.