Arco, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arco, a city in Butte County, Idaho.
Tonight
31°F
Areas Of Fog
Areas of fog. Cloudy. Low around 31, with temperatures rising to around 33 overnight. North wind around 8 mph.
7-day forecast for Arco
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Areas Of Fog | 8 mph N | 1% |
| Wednesday | 52°F | Areas Of Fog then Partly Sunny | 2 to 7 mph W | 1% |
| Wednesday Night | 28°F | Mostly Clear then Patchy Fog | 1 to 5 mph NNW | 0% |
| Thursday | 46°F | Patchy Fog then Partly Sunny | 2 to 6 mph SE | 1% |
| Thursday Night | 26°F | Areas Of Fog | 1 to 6 mph WNW | 1% |
| Friday | 45°F | Mostly Sunny | 1 to 6 mph E | 0% |
| Friday Night | 27°F | Partly Cloudy | 1 to 5 mph N | 0% |
| Saturday | 47°F | Mostly Sunny | 1 to 5 mph ENE | 0% |
| Saturday Night | 29°F | Partly Cloudy | 0 to 3 mph NNE | 0% |
| Sunday | 53°F | Mostly Sunny | 0 to 6 mph SSE | 0% |
| Sunday Night | 31°F | Partly Cloudy | 1 to 5 mph WNW | 0% |
| Monday | 53°F | Partly Sunny | 3 mph E | 0% |
| Monday Night | 32°F | Partly Cloudy | 3 mph WNW | 3% |
| Tuesday | 53°F | Mostly Sunny | 3 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Arco (43.632, -113.301). Updated through the day.
Growing snapshot for Arco
Last spring frost
May 22
First fall frost
Sep 22
Growing season
119 days
Hardiness zone
5a
More local growing data for Arco: nearby ZIP 83255 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Arco, Id (9.6 mi from Arco). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.