Declo, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Declo, a city in Cassia County, Idaho.
Tonight
36°F
Mostly Cloudy
Mostly cloudy. Low around 36, with temperatures rising to around 38 overnight. East northeast wind 0 to 7 mph.
7-day forecast for Declo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Mostly Cloudy | 0 to 7 mph ENE | 3% |
| Wednesday | 51°F | Partly Sunny | 5 to 12 mph WSW | 7% |
| Wednesday Night | 34°F | Partly Cloudy | 1 to 5 mph S | 0% |
| Thursday | 51°F | Partly Sunny | 1 to 7 mph WSW | 2% |
| Thursday Night | 33°F | Patchy Fog | 2 to 8 mph SW | 2% |
| Friday | 52°F | Sunny | 3 mph W | 1% |
| Friday Night | 35°F | Partly Cloudy | 2 mph SSE | 1% |
| Saturday | 56°F | Sunny | 5 mph ESE | 0% |
| Saturday Night | 37°F | Mostly Clear | 3 to 7 mph E | 0% |
| Sunday | 62°F | Mostly Sunny | 2 to 6 mph SE | 0% |
| Sunday Night | 39°F | Partly Cloudy | 3 mph SE | 0% |
| Monday | 61°F | Mostly Sunny | 5 mph E | 0% |
| Monday Night | 40°F | Mostly Cloudy | 3 mph S | 2% |
| Tuesday | 60°F | Mostly Sunny | 3 mph W | 6% |
Forecast source: National Weather Service (api.weather.gov) for Declo (42.520, -113.629). Updated through the day.
Growing snapshot for Declo
Last spring frost
Jun 5
First fall frost
Sep 13
Growing season
96 days
Hardiness zone
6b
More local growing data for Declo: nearby ZIP 83311 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Malta, Id (12.1 mi from Declo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.