Idaho City, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Idaho City, a city in Boise County, Idaho.
Today
87°F
Areas Of Smoke
Areas of smoke. Sunny, with a high near 87. West wind 0 to 5 mph.
7-day forecast for Idaho City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Areas Of Smoke | 0 to 5 mph W | 0% |
| Tonight | 42°F | Smoke | 0 to 5 mph NNW | 0% |
| Wednesday | 92°F | Areas Of Smoke | 0 to 3 mph NNW | 0% |
| Wednesday Night | 45°F | Patchy Smoke | 0 to 5 mph NE | 0% |
| Thursday | 100°F | Patchy Smoke | 1 to 5 mph N | 0% |
| Thursday Night | 50°F | Patchy Smoke | 1 to 5 mph N | 0% |
| Friday | 101°F | Sunny | 1 to 6 mph N | 0% |
| Friday Night | 54°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 99°F | Sunny | 0 to 5 mph NNW | 0% |
| Saturday Night | 54°F | Mostly Clear | 1 to 6 mph NNE | 0% |
| Sunday | 95°F | Sunny | 0 to 5 mph NNW | 0% |
| Sunday Night | 52°F | Mostly Clear | 1 to 5 mph N | 0% |
| Monday | 93°F | Sunny | 0 to 5 mph NNW | 0% |
| Monday Night | 51°F | Mostly Clear | 1 to 5 mph N | 0% |
Forecast source: National Weather Service (api.weather.gov) for Idaho City (43.828, -115.830). Updated through the day.
Growing snapshot for Idaho City
Last spring frost
Jun 17
First fall frost
Sep 5
Growing season
80 days
Hardiness zone
6b
More local growing data for Idaho City: nearby ZIP 83631 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Idaho City, Id (4.2 mi from Idaho City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.