A new and distinct cultivar of Chrysanthemum plant named 'Yellow Yomankato', characterized by its uniform and outwardly spreading plant habit; strong and freely branching growth habit; dark green-colored foliage; uniform flowering response and habit; can be grown as a disbud or spray-type; early flowering habit; anemone-type inflorescences; bright yellow-colored ray florets and enlarged yellow green to bright yellow-colored disc florets; and good postproduction longevity with plants maintaining good substance and color for about three to four weeks in an interior environment.