The Pocumtuck Range hosts a combination of microclimate ecosystems unusual to the region. Eastern red cedar, a dry-loving species, clings to the barren edges of cliffs. Backslope plant communities tend to be similar to the adjacent upland plateaus and nearby Berkshires, containing species common to the northern hardwood and oak-hickory forest ecosystem types. Eastern hemlock crowds narrow ravines, blocking sunlight and creating damp, cooler growing conditions with associated cooler climate plant species. Talus slopes are especially rich in nutrients and support a number of calcium-loving plants uncommon in the region. Miles of cliffs make ideal raptor habitat, and the range is an important seasonal raptor migration corridor. Thirty-seven species of fern can be found on the range, making it one of the richest ecosystems of fern diversity in the Commonwealth of Massachusetts. The range also supports extensive populations of whorled pogonia, a plant on the Massachusetts Environmental Protection Agency's watch list.