Caldwell, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Caldwell, a city in Canyon County, Idaho.
This Afternoon
59°F
Mostly Cloudy
Mostly cloudy, with a high near 59. Southeast wind 3 to 7 mph.
7-day forecast for Caldwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Mostly Cloudy | 3 to 7 mph SE | 1% |
| Tonight | 34°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph NNW | 15% |
| Wednesday | 60°F | Sunny | 1 to 5 mph NW | 2% |
| Wednesday Night | 34°F | Mostly Cloudy | 3 mph ESE | 12% |
| Thursday | 57°F | Partly Sunny | 1 to 5 mph NNW | 12% |
| Thursday Night | 30°F | Mostly Clear then Patchy Fog | 2 mph ESE | 0% |
| Friday | 58°F | Patchy Fog then Partly Sunny | 2 mph E | 1% |
| Friday Night | 32°F | Partly Cloudy | 2 mph NE | 1% |
| Saturday | 63°F | Mostly Sunny | 1 to 8 mph SE | 1% |
| Saturday Night | 38°F | Partly Cloudy | 5 to 10 mph SE | 0% |
| Sunday | 64°F | Mostly Sunny | 2 to 10 mph SW | 0% |
| Sunday Night | 36°F | Mostly Cloudy then Patchy Fog | 2 mph SW | 0% |
| Monday | 62°F | Patchy Fog then Partly Sunny | 2 mph SSW | 4% |
| Monday Night | 36°F | Mostly Cloudy | 2 mph W | 5% |
Forecast source: National Weather Service (api.weather.gov) for Caldwell (43.646, -116.659). Updated through the day.
Growing snapshot for Caldwell
Last spring frost
Apr 29
First fall frost
Oct 13
Growing season
164 days
Hardiness zone
7a
More local growing data for Caldwell: nearby ZIP 83605 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Nampa Sugar Factory, Id (5.6 mi from Caldwell). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.