Surrounded by artistic influences, Winthur's childhood was spent drawing, painting, and sewing clothes for her dolls from her mother's fabric scraps. When it came time for college, she attended the Rhode Island School of Design where she majored in textile design. After graduating, Winthur was hired by a major home products manufacturer in NYC and several of her quilt designs were sold in large retailers like JC Penney's, Sears, Target, and Bed Bath & Beyond. In 2006, she moved to Oregon and started work with Pendleton Woolen Mills. Winthur joined Connecting Threads in 2014 and now lives in Portland with her husband and three daughters.