Firth, ID Weather & Growing Conditions
Overnight
30°F
Cloudy
Cloudy. Low around 30, with temperatures rising to around 33 overnight. East southeast wind around 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 30°F | Cloudy | 12 mph ESE | 2% |
| Wednesday | 42°F | Mostly Cloudy | 6 to 10 mph SW | 3% |
| Wednesday Night | 28°F | Mostly Clear | 6 to 10 mph SW | 1% |
| Thursday | 40°F | Mostly Cloudy | 6 to 10 mph SSW | 9% |
| Thursday Night | 28°F | Partly Cloudy | 8 mph SW | 9% |
| Friday | 39°F | Mostly Sunny | 3 to 9 mph SW | 0% |
| Friday Night | 27°F | Partly Cloudy | 3 to 10 mph SSE | 0% |
| Saturday | 45°F | Sunny | 1 to 10 mph SSW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 1 to 13 mph ESE | 0% |
| Sunday | 50°F | Mostly Sunny | 7 to 15 mph SSE | 0% |
| Sunday Night | 34°F | Partly Cloudy | 7 to 14 mph SSE | 0% |
| Monday | 50°F | Mostly Sunny | 5 to 13 mph S | 0% |
| Monday Night | 35°F | Mostly Cloudy | 5 to 10 mph SSE | 0% |
| Tuesday | 49°F | Mostly Sunny | 3 to 10 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Firth, ID
Last spring frost
Jun 9
First fall frost
Sep 11
Growing season
93 days
Hardiness zone
5b
Explore more for Firth, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Idaho Falls 16 Se, Id (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.