A new and distinct cultivar of Chrysanthemum plant named `Yoyukon`, characterized by its uniform and upright plant habit; strong growth habit; dark green-colored foliage; uniform flowering response and habit; best grown unpinched and as a disbud-type; early flowering habit; decorative incurve-type inflorescences; white-colored ray florets; and good postproduction longevity with plants maintaining good substance and color for about three weeks in an interior environment.