Vermont is located in the New England region in the eastern United States and comprises 9,614 square miles (24,902 km²), making it the 45th largest state. Of this, land comprises 9,250 square miles (23,955 km²) and water comprises 365 square miles (948 km²), making it the 43rd largest in land area and the 47th in water area. In area, it is larger than El Salvador and smaller than Haiti.

The west bank of the Connecticut River marks the eastern border of the state with New Hampshire (the river itself is part of New Hampshire). Lake Champlain, the major lake in Vermont, is the sixth-largest body of fresh water in the United States and separates Vermont from New York in the northwest portion of the state. From north to south, Vermont is 159 miles (256 km). Its greatest width, from east to west, is 89 miles (143 km) at the Canadian border; the narrowest width is 37 miles (60 km) at the Massachusetts line. The state's geographic center is Washington, three miles (5 km) east of Roxbury.

There are six distinct physiographic regions of Vermont. Categorized by geological and physical attributes, they are the Northeastern Highlands, the Green Mountains, the Taconic Mountains, the Champlain Lowlands, the Valley of Vermont and the Vermont Piedmont.

The origin of the name Green Mountains (French: Verts monts) is uncertain. Some authorities say that they are so named because they have much more forestation than the higher White Mountains of New Hampshire and Adirondacks of New York. Other authorities say that they are so named because of the predominance of mica-quartz-chlorite schist, a green-hued metamorphosed shale. The range forms a north-south spine running most of the length of the state, slightly west of its center. In the southwest portion of the state are the Taconic Mountains; the Granitic Mountains are in the northeast. In the northwest near Lake Champlain is the fertile Champlain Valley. In the south of the valley is Lake Bomoseen.

Several mountains have timberlines: Mount Mansfield, the highest mountain in the state, as well as Killington are examples. About 77 percent of the state is covered by forest; the rest is covered in meadow, uplands, lakes, ponds and swampy wetlands.

Areas in Vermont administered by the National Park Service include the Appalachian National Scenic Trail and the Marsh-Billings-Rockefeller National Historical Park in Woodstock.

Cities in Vermont

Cities (2003 estimated population):

• Burlington - 39,148

• Rutland - 17,103

• South Burlington - 16,285

• Barre - 9,166

• Montpelier - 7,945

• St. Albans - 7,565

• Winooski - 6,561

• Newport - 5, 092

• Vergennes - 2,789

Largest towns in Vermont

Although these towns are large enough to be considered cities, they are not incorporated as such. Largest Towns (2003 est.)

• Essex, 18,933

• Colchester, 17,175

• Bennington, 15,637

• Brattleboro, 11,996

• Hartford, 10,610

• Milton, 9,924

Climate

Vermont has a continental moist climate, with warm, humid summers and cold winters, which become colder at higher elevations. It has a Koppen climate classification of Dfb, similar to Minsk, Stockholm and Fargo. Vermont is known for its mud season in spring followed by a generally mild early summer, hot Augusts and a colorful autumn, and particularly for its cold winters. The northern part of the state, including the rural northeastern section (dubbed the "Northeast Kingdom") is known for exceptionally cold winters, often averaging 10 °F (6 °C) colder than the southern areas of the state. Annual snowfall averages between 60 to 100 inches (150–250 cm) depending on elevation, giving Vermont some of New England's best cross-country and downhill ski areas.

In the autumn, Vermont's hills experience an explosion of red, orange and gold foliage displayed on the sugar maple as cold weather approaches. This famous display of color that occurs so abundantly in Vermont is not due so much to the presence of a particular variant of the sugar maple; rather it is caused by a number of soil and climate conditions unique to the area.

The highest-recorded temperature was 105 °F (41 °C), at Vernon on July 4, 1911; the lowest-recorded temperature was -50 °F (-46 °C), at Bloomfield on December 30, 1933.