Jack Frost is the personification of frost and cold weather. A variant of Old Man Winter held responsible for frosty weather, for nipping the nose and toes in such weather, coloring the foliage in autumn, and leaving fern like patterns on cold windows in winter.
Starting in early 20th century literature, more filled-out characterizations of Jack Frost have made him into a sprite-like character. He sometimes appears as a sinister mischief maker.
Jack Frost is a sprite and the personification of crisp, cold, winter weather, a variant of Old Man Winter. He is also at times personified as a mischief making spirit that loves being carefree and a loner. With no obligations he is able to flourish.
He is traditionally thought to leave the frosty, fern like crystal patterns on windows on cold mornings(window frost or fern frost), and nipping the extremities in cold weather. He is sometimes described or depicted with paint brush and bucket coloring the autumnal foliage red, yellow, purple, and orange. Jack Frost is friendly but if provoked, he will kill his victims by covering them with snow. On the other hand, some stories and lore believe that Jack would never put anyone to harm without fair reason, even if he is provoked by the other person. He is sometimes thought of as old but in the new movie "Rise of the Guardians" he is pictured as a teenager.