Red composting worms thrive in temperatures ranging from 55° to 80°F, but can tolerate colder or warmer temperatures as long as they aren’t extreme (above 80° or below 32°F). Keep in mind, these temps are inside the worm bin, not air temperature. If you move your worm bin outside during the summer, be sure to place it in a shaded location protected from rain and wind. When the weather turns colder, insulate the bin from freezing temperatures or move it indoors to a basement, heated garage, or a corner of your kitchen. In cooler temperatures (32° to 54°F), worms will work more slowly and you may need to decrease the amount of food scraps you give them.