Idaho City, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Idaho City, a city in Boise County, Idaho.
Overnight
30°F
Mostly Cloudy
Mostly cloudy, with a low around 30. Wind around 0 mph.
7-day forecast for Idaho City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 30°F | Mostly Cloudy | 0 mph | 1% |
| Wednesday | 58°F | Sunny | 1 mph SSW | 1% |
| Wednesday Night | 28°F | Partly Cloudy | 1 mph NNW | 4% |
| Thursday | 53°F | Partly Sunny | 1 mph W | 6% |
| Thursday Night | 23°F | Patchy Fog | 1 mph NW | 0% |
| Friday | 57°F | Patchy Fog then Mostly Sunny | 0 mph | 0% |
| Friday Night | 26°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 62°F | Sunny | 1 mph WNW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 3 mph ENE | 0% |
| Sunday | 63°F | Mostly Sunny | 2 mph N | 1% |
| Sunday Night | 32°F | Partly Cloudy | 1 mph NE | 1% |
| Monday | 62°F | Partly Sunny | 1 mph NE | 0% |
| Monday Night | 32°F | Mostly Cloudy | 1 mph NNE | 2% |
| Tuesday | 62°F | Patchy Fog then Mostly Sunny | 1 mph NE | 11% |
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 Nov 4, 2026.