My lawn is melted out but the Cannon ski trails are still white

Spring is making an attempt up here.  It is in the forties temp wise.  My lawn is free of snow and the winter shocked grass is attempting to green up.  But the ski trails up on Cannon Mountain are still white.  This comes from all the snow making over the winter, combined with both skiers and snow grooming machines packing the trails down into ice.  They run the groomers ever night during ski season, I can see their lights running up and down the trails in the dark.