Police say 40-year-old Tanya Shannon was riding with her husband when their car hit a light pole December 5. Dale Shannon, 41, died.
Investigators found footprints in the snow leading away from the car, but they have not been able to find Tanya.
Search teams were back out for a while Friday. The sheriff's department says now that the snow has melted, the area is easier to search.
Monday's search efforts will include one helicopter, as well as, dozens of people searching on foot and horseback.