A New spary chrysanthemum (Dendranthema grandiflorum) cultivar ‘ater Fog’was bred by open pollination of ‘ngaesoguk’ Its characteristics were investigated three times from 2004 to 2006 under forcing culture in spring and retarding culture in autumn. The natural flowering time of ‘ater Fog’was 24 October, but year-round production was possible by shading and lighting. It had flower diameter of 2.3 cm, 46.5 petals and 34.4 flowers per stem in autumn. The petal was narrow(0.4cm) and the color of petal was white with presence of green at flower center. Days to flower from short-day start for ‘ater Fog’ was about 48 in spring. ‘ater Fog’showed the vase life of 22.6 days in autumn. This cultivar was registered for a commercialization in 2007. ‘ater Fog’would be cultured under greenhouse and rain shelter condition in Korea.