A new and distinct Hydrangea cultivar named ‘；COUMONT’； is disclosed, characterized mophead inflorescences composed of yellow-green and pink flowers. Plants flower abundantly on same year's growth. Inflorescences and individual flowers hold up well in the rain and plants tolerate both full sun and partial shade. Plants are compact, well-branched and have large foliage The new variety is a Hydrangea, normally produced as an ornamental plant for containers or gardens.
