Declo, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Declo, a city in Cassia County, Idaho.
This Afternoon
52°F
Sunny
Sunny. High near 52, with temperatures falling to around 48 in the afternoon. West wind 5 to 9 mph.
7-day forecast for Declo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Sunny | 5 to 9 mph W | 1% |
| Tonight | 35°F | Mostly Clear | 0 to 3 mph SSW | 1% |
| Thursday | 51°F | Partly Sunny | 1 to 5 mph SW | 2% |
| Thursday Night | 34°F | Patchy Fog | 3 to 8 mph SW | 0% |
| Friday | 50°F | Sunny | 3 mph WSW | 0% |
| Friday Night | 34°F | Mostly Clear | 2 mph SSE | 0% |
| Saturday | 54°F | Sunny | 2 to 7 mph E | 0% |
| Saturday Night | 37°F | Mostly Clear | 3 to 7 mph E | 0% |
| Sunday | 61°F | Mostly Sunny | 2 to 6 mph ESE | 0% |
| Sunday Night | 39°F | Partly Cloudy | 5 mph SE | 0% |
| Monday | 60°F | Mostly Sunny | 5 mph E | 0% |
| Monday Night | 40°F | Mostly Cloudy | 2 mph SE | 0% |
| Tuesday | 59°F | Mostly Sunny | 3 mph W | 2% |
| Tuesday Night | 40°F | Partly Cloudy | 3 mph SSE | 3% |
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 5, 2026.