May 22, 2026
The Appalachian Trail: 14 States and 2,190 Miles of Geography
The Appalachian Trail is the longest hiking-only footpath in the world, stretching 2,190 miles from Springer Mountain in Georgia to Mount Katahdin in Maine. It crosses 14 states, 6 national parks, 8 national forests, and passes through nearly every ecosystem found in eastern North America. For geography students, the AT is a living transect of the Eastern United States — a line drawn through the heart of the oldest mountain range on the continent.
The 14 States
From south to north, the AT passes through Georgia, North Carolina, Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Vermont, New Hampshire, and Maine. Virginia claims the longest section at 554 miles — roughly a quarter of the entire trail. West Virginia has the shortest section at just 4 miles, where the trail passes through Harpers Ferry, the psychological midpoint of the trail and home of the Appalachian Trail Conservancy headquarters.
These 14 states stretch from 34.6°N latitude (Springer Mountain) to 45.9°N (Katahdin) — spanning 11.3 degrees of latitude, equivalent to the distance from Morocco to Denmark. That latitudinal range is why the trail crosses so many climate zones and ecosystems. A thru-hiker who starts in Georgia in early April walks through spring twice — once in the Southern Appalachians, and again in New England two months later.
The Mountain Range
The Appalachian Mountains are old — geologically ancient. They formed roughly 480 million years ago during the Ordovician Period, making them older than the Atlantic Ocean, older than dinosaurs, and older than nearly every other mountain range on Earth. For comparison, the Rockies are about 80 million years old; the Himalayas, about 50 million.
That age explains why the Appalachians are rounded and relatively low. The highest peak the AT crosses is Clingmans Dome in the Great Smoky Mountains at 6,643 feet — impressive, but less than half the height of Colorado's fourteeners. Hundreds of millions of years of erosion have worn the Appalachians down from their original height, which geologists estimate was comparable to the modern Alps or Rockies.
The range extends from Alabama to Newfoundland, spanning 1,500 miles. The AT follows its spine through the range's most varied sections: the Blue Ridge in Virginia and North Carolina, the Ridge and Valley province in Pennsylvania, the Green Mountains in Vermont, and the White Mountains in New Hampshire.
Climate Transects
The AT is a climate gradient in walking form. At Springer Mountain in Georgia, the climate is humid subtropical — warm, wet, with mild winters. Average January temperatures hover around 40°F. By the time the trail reaches the White Mountains of New Hampshire, the climate is subarctic at elevation. Mount Washington, which the AT skirts, holds the record for the highest wind speed ever recorded in the Northern Hemisphere: 231 mph.
Annual precipitation along the trail varies dramatically. The Great Smoky Mountains are the wettest part of the trail, receiving over 85 inches of rain per year — more than Seattle. The Shenandoah Valley in Virginia, by contrast, sits in a rain shadow and receives about 35 inches. Maine's 100-Mile Wilderness is relatively dry but receives heavy snowfall — some sections are impassable from November through May.
Ecosystems on the Trail
The trail passes through five major forest types. In Georgia and the southern Blue Ridge, it's cove hardwood forest: tulip poplars, oaks, and hickories growing in sheltered valleys with an understory of rhododendron and mountain laurel. Above 5,000 feet in the Smokies, spruce-fir forest takes over — the same boreal ecosystem found in Maine and southern Canada.
In the Mid-Atlantic states, the trail passes through oak-hickory forest, the dominant forest type of the Eastern United States. In New England, it transitions to northern hardwoods — beech, birch, and maple — the trees responsible for the famous fall foliage. Above treeline in the White Mountains (roughly 4,800 feet), the trail enters alpine tundra: low shrubs, sedges, and lichens that survive in conditions too harsh for trees.
This vertical and latitudinal compression of ecosystems makes the AT one of the best natural classrooms in America. A hiker in the Smokies can walk from subtropical forest to boreal forest in a single day by gaining 3,000 feet of elevation — a biome transition that would normally require driving 1,000 miles north.
The Trail as State Borders
The AT crosses 22 major rivers and follows several state borders. The most notable is the North Carolina-Tennessee border along the Great Smoky Mountains, where the trail runs directly on the state line for over 70 miles. The border was drawn along the crest of the Smokies in 1796, following the highest ridgeline — which is exactly where the AT runs today.
At Harpers Ferry, West Virginia, the trail crosses the Potomac River at the confluence with the Shenandoah River — a spot where Virginia, West Virginia, and Maryland nearly meet. This was one of the most strategically important geographic points in the Civil War, and it's the only place where the AT enters West Virginia.
By the Numbers
2,190
Miles
14
States
464,500
Feet of elevation gain
3M+
Annual visitors
Only about 3,000 people per year attempt a thru-hike (walking the entire trail in one continuous journey), and only about 25% of those finish. Most people experience the AT through day hikes and short sections. The trail passes within a day's drive of two-thirds of the US population.
How well do you know the AT states?
Can you locate all 14 Appalachian Trail states on a blank map?