thumb|right|A fellfield in [[Mount Rainier National Park ]]
A fellfield or fell field comprises the environment of a slope, usually alpine or tundra, where the dynamics of frost (freeze and thaw cycles) and of wind give rise to characteristic plant forms in scree interstices.
Soil dynamics
The freeze-thaw cycles tend to push plants out of the soil. In addition, the high porosity of the soil makes a fellfield a difficult place for plants to grow.
Flora
Fellfields are typically populated by cushion plants: perennials that grow close to the ground. Cushion plants are well-adapted to the dryness and short growing season of a fellfield. Cushion plants often have hairy foliage and long taproots, to gather and retain moisture. Examples of cushion plants include the lupines and buckwheats.