New Plymouth, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Plymouth, a city in Payette County, Idaho.
Today
79°F
Mostly Sunny
Mostly sunny, with a high near 79. North northwest wind around 5 mph.
7-day forecast for New Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Sunny | 5 mph NNW | 12% |
| Tonight | 49°F | Mostly Clear | 1 to 5 mph SW | 3% |
| Sunday | 82°F | Sunny | 3 mph SSE | 0% |
| Sunday Night | 49°F | Mostly Clear | 2 mph S | 0% |
| Monday | 83°F | Sunny | 2 mph ENE | 0% |
| Monday Night | 52°F | Partly Cloudy | 3 mph WNW | 0% |
| Tuesday | 85°F | Sunny | 2 mph S | 0% |
| Tuesday Night | 51°F | Mostly Clear | 1 mph NE | 0% |
| Wednesday | 85°F | Sunny | 3 mph SE | 0% |
| Wednesday Night | 51°F | Mostly Clear | 2 mph NNE | 0% |
| Thursday | 85°F | Sunny | 2 mph SE | 0% |
| Thursday Night | 52°F | Partly Cloudy | 2 mph NNE | 1% |
| Friday | 82°F | Mostly Sunny | 3 mph S | 1% |
| Friday Night | 49°F | Partly Cloudy | 5 mph NW | 5% |
Forecast source: National Weather Service (api.weather.gov) for New Plymouth (43.970, -116.819). Updated through the day.
Growing snapshot for New Plymouth
Last spring frost
Apr 22
First fall frost
Oct 9
Growing season
168 days
Hardiness zone
7a
More local growing data for New Plymouth: nearby ZIP 83655 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ontario Ksrv, Or (11.1 mi from New Plymouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.