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Monarchs must not get too cold! Monarchs save energy by living in a cool place, but there are also dangers. If temperatures are too cold, monarch butterflies can freeze to death. Wet, cold monarchs are in particular danger. Ice crystals can form and kill the butterfly. Photo © Dr. Lincoln P. Brower, Sweet Briar College This Season Teachers Kids Orientation Registration Search Copyright 1997-2010 Journey North. All Rights Reserved. Questions or comments? Contact us.