Firth, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firth, a city in Bingham County, Idaho.
Overnight
47°F
Patchy Smoke
Patchy smoke. Mostly clear. Low around 47, with temperatures rising to around 50 overnight. North northwest wind around 3 mph.
7-day forecast for Firth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Patchy Smoke | 3 mph NNW | 0% |
| Tuesday | 81°F | Patchy Smoke | 2 to 9 mph W | 0% |
| Tuesday Night | 50°F | Areas Of Smoke | 3 to 9 mph SSW | 0% |
| Wednesday | 85°F | Areas Of Smoke | 2 to 8 mph SSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 7 mph S | 0% |
| Thursday | 92°F | Sunny | 2 to 8 mph SSW | 0% |
| Thursday Night | 57°F | Clear | 7 mph S | 0% |
| Friday | 94°F | Sunny | 2 to 8 mph ESE | 0% |
| Friday Night | 59°F | Clear | 5 to 14 mph SSW | 0% |
| Saturday | 94°F | Sunny | 2 to 10 mph SSW | 0% |
| Saturday Night | 60°F | Mostly Clear | 5 to 15 mph SSW | 0% |
| Sunday | 93°F | Sunny | 2 to 16 mph SSW | 0% |
| Sunday Night | 59°F | Mostly Clear | 5 to 18 mph SSW | 0% |
| Monday | 92°F | Sunny | 3 to 14 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Firth (43.306, -112.183). Updated through the day.
Growing snapshot for Firth
Last spring frost
May 5
First fall frost
Oct 3
Growing season
149 days
Hardiness zone
5b
More local growing data for Firth: nearby ZIP 83218 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Blackfoot Fire Dept, Id (12.6 mi from Firth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.