New Hampshire’s foliage season runs roughly from late-September to mid-October, but this varies widely depending on weather, topography and geography. Just before the season begins, a sneak preview of fall can be found as swamp maples surrounding some ponds and lakes may turn a fiery red, and the deciduous trees of northern New Hampshire may have already begun their transformation.  Indigenous Peoples' Day Weekend is often the focal point of fall foliage excursions, but the White Mountains can present earlier colors.