Declo, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Declo, a city in Cassia County, Idaho.
Tonight
48°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 3am and 4am, then a chance of showers and thunderstorms. Partly cloudy. Low around 48, with temperatures rising to around 50 overnight. Southwest wind around 8 mph. Chance of precipitation is 30%.
7-day forecast for Declo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 mph SW | 33% |
| Saturday | 65°F | Showers And Thunderstorms Likely | 6 to 10 mph WSW | 66% |
| Saturday Night | 47°F | Partly Cloudy | 3 mph S | 5% |
| Sunday | 72°F | Sunny | 5 mph ENE | 0% |
| Sunday Night | 49°F | Mostly Clear | 5 mph ESE | 0% |
| Monday | 77°F | Sunny | 5 to 8 mph E | 0% |
| Monday Night | 52°F | Partly Cloudy | 5 mph ESE | 0% |
| Tuesday | 77°F | Mostly Sunny | 6 mph ENE | 3% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph SSW | 4% |
| Wednesday | 79°F | Sunny | 5 mph E | 3% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph ESE | 2% |
| Thursday | 81°F | Sunny | 7 mph ESE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph SE | 0% |
| Friday | 82°F | Mostly Sunny | 7 mph S | 4% |
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 Sep 19, 2026.