Cattail thickets around ponds, or anyplace a hedgerow makes a depression, like where seasonal water can runoff. If it's cold/windy the birds will try and get out of it so the downwind side of hills can be good. If cover is sparse but food is present they will hold under small pine trees especially early am. They usually won't associate with big stands of trees, but if surrounded by thorn thickets, they will be in there. Just rambling off the top of my head, but you will generally find them in the thickest section of cover in an area when it's cold.
Small pine trees
Any ditch created by water runoff