Idaho City, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Idaho City, a city in Boise County, Idaho.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. West northwest wind around 2 mph.
7-day forecast for Idaho City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 2 mph WNW | 4% |
| Tonight | 40°F | Mostly Clear then Areas Of Fog | 2 mph N | 2% |
| Sunday | 79°F | Areas Of Fog then Sunny | 1 mph N | 1% |
| Sunday Night | 42°F | Mostly Clear | 1 mph N | 0% |
| Monday | 83°F | Sunny | 2 mph NNE | 0% |
| Monday Night | 44°F | Partly Cloudy | 2 mph N | 0% |
| Tuesday | 83°F | Mostly Sunny | 2 mph NE | 0% |
| Tuesday Night | 45°F | Partly Cloudy | 1 mph NE | 1% |
| Wednesday | 83°F | Sunny | 3 mph SSE | 0% |
| Wednesday Night | 44°F | Mostly Clear | 2 mph NNE | 0% |
| Thursday | 85°F | Sunny | 1 to 5 mph SE | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph SE | 0% |
| Friday | 82°F | Mostly Sunny | 3 mph SE | 2% |
| Friday Night | 42°F | Partly Cloudy | 2 mph NE | 5% |
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 Sep 19, 2026.