A new and distinct cultivar of Chrysanthemum plant named `Yodarlene`, characterized by its compact, upright and outwardly spreading plant habit; freely branching habit; dense and full plant habit; uniform and freely flowering habit; decorative-type inflorescences with elongated oblong to obovate-shaped ray florets; purple-colored ray florets; and natural season flowering about September 20.sup.th in the Northern Hemisphere.