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
45°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 45, with temperatures rising to around 47 overnight. Northwest wind around 5 mph.
7-day forecast for Lost River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Areas Of Smoke | 5 mph NW | 0% |
| Tuesday | 81°F | Areas Of Smoke | 3 to 14 mph SSW | 0% |
| Tuesday Night | 49°F | Areas Of Smoke | 6 to 14 mph WNW | 0% |
| Wednesday | 85°F | Areas Of Smoke | 3 to 14 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 7 to 12 mph WNW | 0% |
| Thursday | 91°F | Sunny | 3 to 13 mph W | 0% |
| Thursday Night | 56°F | Mostly Clear | 6 to 14 mph W | 0% |
| Friday | 92°F | Sunny | 5 to 16 mph WSW | 0% |
| Friday Night | 56°F | Mostly Clear | 7 to 18 mph WNW | 0% |
| Saturday | 92°F | Sunny | 3 to 18 mph WSW | 1% |
| Saturday Night | 56°F | Mostly Clear | 6 to 20 mph WNW | 0% |
| Sunday | 90°F | Sunny | 3 to 22 mph WSW | 1% |
| Sunday Night | 54°F | Mostly Clear | 5 to 22 mph WNW | 1% |
| Monday | 89°F | Sunny | 3 to 21 mph WSW | 0% |
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 Aug 4, 2026.