In Colorado, a rare robin will stay around all year, if it's a mild winter. Typically, though, we see the first brave soul some time in March. Colorado weather in March can have cold, snowy days, as well as milder, sunny days. I always feel sorry for the hardy few who seem to survive on old dried up virginia creeper berries and puny russian olives. By April, things are starting to green up and the robins, like this guy, are scouting for nesting areas.