Snow, grass, dirt, gravel. These unconventional runway surfaces have something in common: You’ll employ the same type of landing for each.
A soft-field landing enables the aircraft’s wings to support its weight as long as possible, so as to minimize the chance of its wheels sinking (into snow, soil, or wet grass). Touchdown is as soft as possible, and that is achieved through energy management. In other words, you’ll likely add or keep a bit of power in the flare to avoid touching down too firmly. Consult your airplane’s pilot’s operating handbook for airspeeds and flap settings—and before you land a rental aircraft on any unpaved surface, confirm that this is permissible. (Insurance requirements may prohibit that grass-field arrival.)
Skills for Task D, Soft-field approach and landing (ASEL)