A site protected from drying winds prevents too much moisture loss. Another consideration is convenience for moving volumes of plant materials in and out of the area. Choose a site close to where material will be used, but not highly visible or that interferes with yard activities. Structures aren't necessary for composting but do prevent wind and marauding animals from carrying away plant wastes. They vary in how well they can be managed to meet the requirements for effective decomposition under Colorado environmental conditions.
Many people cover their compost with plastic to prevent the outer layers from drying too much.
Remove the covers periodically to add more water and plant material and to aerate the mass. In-ground pit composting presents problems with turning or aerating the plant material and also can pool water, which leads to undesirable low oxygen conditions. A minimum volume of material is necessary to build up the heat necessary for efficient composting. This volume is generally around 36 inches by 36 inches by 36 inches. Well-insulated wood or plastic structures can be smaller and still hold enough heat to compost well.