The fledgling town of De Smet in the Dakota Territory is hit hard by the brutal winter of 1880-1881. Laura, Pa, Ma, Mary, Carrie, and little Grace face the winter as best they can, but soon, blizzards have covered the town in snow that piles up to the rooftops, cutting the town off from supplies and trade. Food stores begin to run dangerously low. To save the town from starvation, young Almanzo Wilder and a friend brave the conditions, set off across the prairie in search of wheat, and return victorious. The town is saved, and the townspeople share in an unusual, but joyful, Christmas celebration.