Ideally, package bees should be installed in late afternoon or early evening, when there is little opportunity for flight. On cool days, package bees may be put into hives at any time. If the bees are well fed, they are much easier to install.deally, package bees should be installed in late afternoon or early evening, when there is little opportunity for flight. On cool days, package bees may be put into hives at any time. If the bees are well fed, they are much easier to install.