Idaho Transportation Department closed Highway 21, between Idaho City and Lowman, due to risk of avalanche and deep snow across the road.
A previous closure on Highway 21, from Grandjean to Banner Summit, is still in place.
Other roads were also closed due to snow.
Idaho Transportation Department closed sections of Highway 32 and Highway 33 due to hazardous driving conditions.
Drivers are urged to check 511.idaho.gov for updates on road closures, before driving anywhere.