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The Bortle scale serves as a valuable tool for measuring the darkness of the night sky, providing insight into optimal stargazing locations across the United States. Ranging from Class 1 (minimal light pollution) to Class 9 (severe light pollution), the scale offers astronomers and enthusiasts a standardized method for assessing the quality of celestial observation sites.
States such as Alaska, California, and Oregon boast some of the darkest skies in the country, with Bortle scale ratings ranging from 7 to 13. These regions offer unparalleled opportunities for stargazing, with designated sites like Anza-Borrego Desert State Park, Death Valley National Park, and Prineville Reservoir State Park providing pristine views of the cosmos.
Furthermore, the International Dark-Sky Association (IDA) plays a crucial role in preserving and promoting dark-sky sites worldwide. Certified locations, including national parks, state forests, and wildlife reserves, offer protected environments for observing the wonders of the night sky.
Local astronomy clubs serve as invaluable resources for enthusiasts seeking precise, local-scale guidance in locating the darkest and most ideal viewing locations. By collaborating with these organizations and utilizing resources such as the IDA's Dark Sky Finder, individuals can embark on unforgettable journeys to explore the beauty of the cosmos from some of the darkest states in the nation.
State | # of Bortle 1 Sites | # of Bortle 2 Sites | # of Bortle 3 Sites | # of Bortle 4 Sites | # of Bortle 5 Sites | # of IDA Certified Sites | IDA-Certified Sites |
---|---|---|---|---|---|---|---|
Alaska | 13 | 9 | |||||
California | 7 | 32 | 3 | Anza-Borrego Desert SP, Death Valley NP Joshua Tree NP | |||
Oregon | 7 | 25 | 1 | Prineville Reservoir SP | |||
Utah | 6 | 17 | 19 | Antelope Island SP, Arches NP, Bryce Canyon NP, Canyonlands NP, Capitol Reef NP, Cedar Breaks NM, Dead Horse Point SP, East Canyon SP, Fremont Indian SP, Goblin Valley SP, Goosenecks SP, Hovenweep NM, Jordanelle SP, Kodachrome Basin SP, Natural Bridges NM, North Fork SP, Rainbow Bridge NM, Steinaker SP, Timpangogos NM, | |||
Montana | 4 | 8 | 1 | Medicine Rocks SP | |||
Nevada | 4 | 6 | 2 | Great Basin NP Massacre Rim WSA | |||
New Mexico | 4 | 13 | 8 | Capulin Volcano NM, Chaco Culture NP, Clayton Lake SP, Cosmic Campground, El Morro NM, Fort Union NM, Salinas Pueblo Missions NM, Valle de Oro NWR | |||
Idaho | 3 | 9 | 2 | Craters of the Moon NM, Central Idaho Dark Sky NR | |||
Colorado | 2 | 17 | 7 | Dinosaur NM, Florissant Fossil Beds NM, Great Sand Dunes NP, Jackson Lake SP, Kelso Dunes NP, Mesa Verde NP, Slumgullion Center CP, | |||
Hawaii | 2 | 13 | 1 | ||||
Nebraska | 2 | 1 | 3 | ||||
Wyoming | 2 | 4 | |||||
Arizona | 1 | 7 | 9 | Chiricahua NM, Flagstaff Area NM, Grand Canyon NP, Kartchner Caverns SP, Oracle SP, Petrified Forest NP, Pipe Spring NM, Tonto Monument NM, Tumacacori NP | |||
Maine | 1 | 10 | 1 | Katahdin Woods & Waters NM | |||
Michigan | 1 | 20 | 2 | Dr. T.K. Lawless CP, Headlands SP | |||
Minnesota | 1 | 15 | 2 | Boundary Waters Canoe NWR, Voyageurs NP | |||
New Hampshire | 1 | 10 | |||||
New York | 1 | 1 | 17 | ||||
Oklahoma | 1 | 5 | 9 | ||||
South Dakota | 1 | 13 | |||||
Texas | 1 | 12 | 2 | 7 | Big Bend NP, Big Bend Ranch SP, Copper Breaks SP, Devil's River SNA, Enchanted Rock SNA, South Llano River SP, UBarU Camp & Retreat | ||
Alabama | 3 | 3 | |||||
Arkansas | 3 | 1 | Buffalo National River NR | ||||
Connecticut | 13 | 3 | Beckley Furnace SP, Campbell Falls SP, Dennis Hill SP | ||||
Delaware | 6 | ||||||
Florida | 3 | 1 | 2 | Big Cypress Preserve NP, Kissimmee Prairie SP | |||
Georgia | 2 | 5 | 1 | Stephen C. Foster SP | |||
Illinois | 1 | 5 | 1 | Middle Fork River SF | |||
Indiana | 3 | ||||||
Iowa | 1 | 12 | |||||
Kansas | 11 | ||||||
Kentucky | 2 | ||||||
Louisiana | 2 | 7 | |||||
Maryland | 2 | ||||||
Massachusetts | 3 | ||||||
Mississippi | 6 | ||||||
Missouri | 2 | ||||||
New Jersey | 2 | ||||||
North Carolina | 3 | 3 | 2 | Mayland Earth to Sky SP Pisgah SP | |||
North Dakota | 1 | 5 | |||||
Ohio | 4 | 1 | Geauga SP | ||||
Pennsylvania | 2 | 17 | 1 | Cherry Springs SP | |||
Rhode Island | 7 | ||||||
South Carolina | 3 | ||||||
Tennessee | 2 | 5 | 2 | Obed Wild & Scenic River NR Pickett CCC Memorial SP | |||
Vermont | 8 | ||||||
Virginia | 4 | 4 | 5 | James River SP, Natural Bridge SP, Rappahannock CP, Sky Meadow SP, Staunton River SP | |||
Washington | 15 | 1 | Rockport SP | ||||
West Virginia | 8 | 1 | |||||
Wisconsin | 4 | 6 | 1 | Newport SP |