Caldwell, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Caldwell, a city in Canyon County, Idaho.
Tonight
50°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3am, then areas of fog. Mostly cloudy, with a low around 50. Northwest wind around 3 mph. Chance of precipitation is 20%.
7-day forecast for Caldwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Slight Chance Showers And Thunderstorms | 3 mph NW | 22% |
| Saturday | 79°F | Areas Of Fog then Mostly Sunny | 2 to 7 mph NW | 4% |
| Saturday Night | 49°F | Mostly Clear | 3 mph ESE | 0% |
| Sunday | 82°F | Areas Of Fog then Sunny | 3 mph SE | 0% |
| Sunday Night | 51°F | Mostly Clear | 2 mph NE | 0% |
| Monday | 84°F | Sunny | 3 mph ESE | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Tuesday | 84°F | Sunny | 2 mph NNW | 1% |
| Tuesday Night | 52°F | Mostly Clear | 3 mph E | 1% |
| Wednesday | 85°F | Sunny | 3 mph S | 1% |
| Wednesday Night | 52°F | Mostly Clear | 3 mph ENE | 1% |
| Thursday | 88°F | Sunny | 6 to 10 mph SE | 0% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph SE | 0% |
| Friday | 85°F | Mostly Sunny | 8 mph SSW | 0% |
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 Sep 19, 2026.