A unique cultivar of Hybrid Creeping Phlox named ‘;Rocky Road Grape’; characterized by vigorous, dense, spreading, multi-stemmed, winter-hardy habit with short, bright glossy-green, linear leaves. Flowering begins in mid-April and continuing for up to five weeks, in cool conditions, on heavily-branched peduncles and completely cover the plant in peak season. Petals are red-purple with a small dark-purple eye. Petals lighten to soft lavender with maturity. Petal apices are deeply notched. The new plant is able to withstand dry conditions once established, and the foliage stays clean and resists mildew. The new plant is especially suitable for the landscape as a potted plant and in the garden as a specimen or en masse.