It will be tricky but just look for big areas with green grass. After the bears get out of hibernation they eat a ton of green grass to get their digestive systems running properly again. You will most likely find them in these areas, saturated with green grass.
Also, they will be lower, where the snow is not, so look in the bottom of canyons and in areas where the snow has melted. If your unit just happens to be covered in snow, there will be few areas where they will want to hang out so there might be high concentrations in smaller areas.