Rattlesnake Exploration Database

The Rattlesnake Conservancy Species Database is a tool that can be used by the public, researchers, government, private herpetoculturists, and the like to find information on the status of rattlesnakes in their state or country. This database is searchable by any field below. We are constantly updating this database, so if you see an error or missing data, please send us a message or email us at info@savethebuzztails.org

We are also developing an interactive map that shows the range of all known rattlesnake species in the New World (the Americas). 

Least concern - current information indicates this species is not in need of immediate conservation action to prevent extinction

Declining - current information indicates that this species is markedly declining due to various factors, such as rattlesnake roundups, climate change, indiscriminate killing, habitat destruction, fragmentation, lack of habitat management, and/or other natural and manmade features.

Crotalid of Special Concern - Species of rattlesnake that have been identified by TRC as needing proactive conservation measures to prevent becoming imperiled.

Imperiled - Species of rattlesnake that have an immediate threat of extinction or have a small endemic range without a resilient population.

Common name
Scientific name
Country(ies)
States of Occurrence
Tehuantepec Isthmus Neotropical rattlesnake
Crotalus ehecatl
Mexico (confirmed), Guatemala (possible)
Oaxaca (MX), Chiapas (MX); possibly into Veracruz (MX) and Huehuetenango (GT)
Veracruz Neotropical Rattlesnake
Crotalus mictlantecuhtli
Mexico
Veracruz (confirmed), Tabasco (possible), Oaxaca (possible)
Oaxacan Pygmy Rattlesnake
Crotalus brunneus
Mexico
Oaxaca
Southern Ridgenose Rattlesnake
Crotalus willardi meridionalis
Mexico
Arizona (US), New Mexico (US), Sonora (MX), Chihuahua (MX), Durango (MX)
Del Nido Ridgenose Rattlesnake
Crotalus willardi amabilis
Mexico
Chihuahua
San Lucan Rattlesnake
Crotalus ruber lucansensis
Mexico
Baja California Sur
San Lorenzo Island Rattlesnake
Crotalus ruber lorenzoensis
Mexico
Baja California
Eastern Twin-spotted Rattlesnake
Crotalus pricei miquihuanus
Mexico, United States
Nuevo Leon, Tamaulipas, Coahuila
Oaxacan Blacktail Rattlesnake
Crotalus molossus oaxacus
Mexico
Oaxaca
El Muerto Island Rattlesnake
Crotalus muertensis
Mexico
Baja California
San Lucan Speckled Rattlesnake
Crotalus mitchelli mitchelli
Mexico
Baja California, Santa Margarita, Cerralvo, Espiritu Santo, San Jose, Monserrate, Carmen
Omilteman Small-Headed Rattlesnake
Crotalus intermedius omiltemanus
Mexico
Guerrero, Chilpancingo
Oaxacan Small-Headed Rattlesnake
Crotalus intermedius gloydi
Mexico
Oaxaca, Puebla
Rosario Rattlesnake
Crotalus enyo furvus
Mexico
Baja California Sur
Rupunini Rattlesnake
Crotalus durissus trigonicus
Brazil, SW Guyana
Upper Takutu-Upper Esequibo (Region 9) (GY), Roraima (BZ)
South American Rattlesnake
Crotalus durissus terrificus
Brazil, Uruguay, Argentina, Paraguay, Bolivia, Extreme Eastern Peru
Maranhão (BZ), Piauí (BZ), Tocantins (BZ), Ceará (BZ), Rio Grand do Norte (BZ), Paraíba (BZ), Pernambuco (BZ), Alagoas (BZ), Sergipe (BZ), Bahia (BZ), Minas Gerais (BZ), Goiás (BZ), Espírito Santo (BZ), São Paulo (BZ), Paraná (BZ), Santa Catarina (BZ), Rio Grande do Sul (BZ), Mato Grosso (BZ), Mato Grosso do Sul (BZ), Rondônia (BZ); isolated populations in Amazonas (BZ) and Pará (BZ) Salta (AR), Formosa (AR), Chaco (AR), Corrientes (AR), Misiones (AR), Entre Ríos (AR), Sante Fe (AR), Córdoba (AR), San Luis (AR), La Rioja (AR), Catamarca (AR), Tucumán (AR), Santiago del Estero (AR), Possibly eastern Mendoza (AR) Concepción (PY), San Pedro (PY), Cordillera (PY), Guairá (PY), Caaguazú (PY), Caazapá (PY), Itapúa (PY), Misiones (PY), Paraguarí (PY), Alto Paraná (PY), Departamento Central (PY), Ñeembucú (PY), Amambay (PY), Canindeyú (PY), Departamento de Presidente Hayes (PY), Alto Paraguay (PY), Boquerón(PY) Argitas (UY), Salto (UY), Rivera (UY), Tacuarembó (UY), Cerro Largo (UY), Treinta y Tres (UY), Rocha (UY) Lavalleja (UY), Maldonado (UY) Santa Cruz (BO), Beni (BO), La Paz (BO), Tarija (BO), Cochabamba (BO), Chuquisaca (BO) Puno (PE), Madre de Dios (PE)
Mt. Roriama Rattlesnake
Crotalus durissus ruruima
Venezuela, Brazil
Roraima (BZ), Estado Bolívar (VZ)
Guarico Rattlesnake
Crotalus durissus pifanorum
Venezuela
Guárico
Marajoan Rattlesnake
Crotalus durissus marajoensis
Brazil
Pará (BZ)
Guiana Rattlesnake
Crotalus durissus durissus
Guyana, French Guiana (France), Suriname, Possibly into extreme Northeastern Brazil
Barima-Waini (GY), Pomeroon-Supenaam (GY), Essequibo Islands-West Demerara (GY), Demerara-Mahaica (GY), Mahaica-Berbice (GY), East Berbice-Corentyne (GY), Cuyuni-Mazaruni (GY) Nickerie (SR), Coronie (SR), Saramacca (SR), Brokopondo (SR), Para (SR), Suriname (SR), Paramaribo (SR), Commewijne (SR), Marowijne (SR) French Guiana (Overseas department of France) (FR-GF) Possibly into Amapá (BZ)
Venezuelan Rattlesnake
Crotalus durissus cumanensis
Venezuela, Colombia
La Guarija (CO), Cesar (CO), Magdelena (CO), Atlántico (CO), Bolívar (CO), Anitoquia (CO), Córdoba (CO), Santander (CO), Boyacá (CO), Caldas (CO), Cundinamarca (CO), Sucre (CO), Arauca (CO), Casanare (CO), Norte de Santander (CO), Tolima (CO), Vichada (CO), Meta (CO) Anzoátegui (VE), Aragua (VE), Apure (VE), Barinas (VE), Bolívar (VE), Carabobo (VE), Cojedes (VE), Falcón (VE), Guárico (VE), Vargas (VE), La Guaira (VE), Lara (VE), Mérida (VE), Miranda (VE), Monagas (VE), Nueva Esparta (VE), Portuguesa (VE), Sucre (VE), Táchira (VE), Trujillo (VE), Yaracuy (VE), Zulia (VE),
Guerreran Pygmy Rattlesnake
Crotalus exiguus
Mexico
Guerrero
Central Plateau Pygmy Rattlesnake
Crotalus ravus
Mexico
Morelos, Puebla, Veracruz
Huamantlan Rattlesnake
Crotalus scutulatus salvini
Mexico
Hidalgo, Tlaxcala, Puebla, Veracruz, Guanajuato, Querétaro
Durango Rock Rattlesnake
Crotalus lepidus maculosus
Mexico
Durango, Sinaloa, Nayarit
Mottled Rock Rattlesnake
Crotalus lepidus lepidus
USA, Mexico
New Mexico (US), Texas (US), Chihuahua (MX), Coahuila (MX)
Great Basin Rattlesnake
Crotalus oreganus lutosus
United States of America
Oregon, Idaho, California, Nevada, Utah, Arizona
Southern Pacific Rattlesnake
Crotalus oreganus helleri
United States of America, Mexico
California (USA), Baja California (Mex)
Isla Coronado Rattlesnake/Mexican Insular Rattlesnake
Crotalus oreganus caliginis
Mexico
Baja California
Grand Canyon Rattlesnake
Crotalus oreganus abyssus
USA
Arizona
Midget Faded Rattlesnake
Crotalus oreganus concolor
United States
Wyoming, Colorado, Utah, possible extreme NW Arizona
New Mexico Ridge-nosed Rattlesnake
Crotalus willardi obscurus
United States of America and Mexico
USA: Arizona, New Mexico; Mexico: Sonora and Chihuahua
Tortuga Island Rattlesnake
Crotalus tortugensis
Mexico
Baja California
Arizona Black Rattlesnake
Crotalus cerberus
United States of America
Arizona, New Mexico
Eastern Black-Tailed Rattlesnake
Crotalus ornatus
United States of America, Mexico
Texas (USA); Chihuahua, Nuevo León (MX)
Mojave Desert Sidewinder
Crotalus cerastes cerastes
United States of America
California, Nevada, Utah, Arizona
Sonoran Desert Sidewinder
Crotalus cerastes cercobombus
USA, Mexico
Arizona (USA), Sonora (MX)
Chihuahua Ridgenosed Rattlesnake
Crotalus willardi silus
Mexico, US
Sonora (MX), Chihuahua (MX), New Mexico (US)
Mexican Lance-Headed Rattlesnake
Crotalus polystictus
Mexico
Zacatecas, Aguasalientes, Jalisco, Colima, Guanajuato, Michoacan, Queretaro, Hidalgo, Estado de Mexico (Mexico State), Tlaxcala, Puebla, Morelos, Mexico City (Mexico D.F.), Veracruz
Tlaloc's Rattlesnake
Crotalus tlaloci
Mexico
Guerrero, Estado de México, Michoacán, Morelos, and possibly into Puebla
Baja California Rattlesnake
Crotalus enyo enyo
Mexico
Baja California, Baja California Sur
Santa Catalina Island Rattlesnake
Crotalus catalinensis
Mexico
Baja California Sur
Mexican Black-tailed Rattlesnake
Crotalus molossus nigrescens
Mexico
Sinaloa, Sonora, Chihuahua, Durango, Coahuila, Oaxaca, Veracruz, Tlaxcala, Zacatecas, Hidalgo, Aguascalientes, Quéretaro, Tamaulipas, San Luis Potosí, Morelos, Jalisco, Guanajuato, Nuevo León, Puebla, Nayarit
Tiger Rattlesnake
Crotalus tigris
United States of America, Mexico
Arizona (USA), Sonora (MX), possibly in extreme southwestern New Mexico (USA) and extreme northwestern Chihuahua (MX)
Western Pygmy Rattlesnake
Sistrurus miliarius streckeri
United States of America
Texas, Louisiana, Arkansas, Oklahoma, Missouri, Mississippi, Alabama, Tennessee
Carolina Pygmy Rattlesnake
Sistrurus miliarius miliarus
United States of America
North Carolina, South Carolina, Georgia, Northwestern Alabama
Totonacan rattlesnake; Totonacas rattlesnake
Crotalus totonacus
Mexico
San Luis Potosí, Nuevo León, Tamaulipas, Querétaro, Hidalgo, and Veracruz.
Uracoan rattlesnake; Cascabel de Uracoa
Crotalus vegrandis
Venezuela
Monagas and Anzoátegui.
Autlán Rattlesnake or Manantlán Long-tailed Rattlesnake
Crotalus lannomi
Mexico
Jalisco & Colima
Timber/Canebrake Rattlesnake
Crotalus horridus
United States of America, Canada
Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, New Jersey, Pennsylvania, New York, New Hampshire, Connecticut, Vermont, Alabama, Mississippi, Tennessee, Kentucky,Ohio, Indiana, Illinois, Minnesota, Wisconsin, Iowa, Louisiana, Texas, Oklahoma, Arkansas, Kansas, Missouri, Ontario (extirpated), Maine (extirpated), Rhode Island (extirpated)
Prairie Rattlesnake, Western Rattlesnake, Great Plains Rattlesnake
Crotalus viridis viridis
United States, Canada, Mexico
Alberta (CN), Saskatchewan (CN), Montana (US), Idaho (US), North Dakota (US), South Dakota (US), Wyoming (US), Colorado (US), Nebraska (US), Colorado (US), Kansas (US), New Mexico (US), Oklahoma (US), Texas (US), eastern Iowa (US), Chihuahua (MX), Coahuila (MX) Possibly into extreme southeast Arizona (US) and northeast Sonora (MX)
Eastern Massasauga Rattlesnake
Sistrurus catenatus
United States of America and Canada
New York, Illinois, Iowa, Missouri, Wisconsin, Indiana, Michigan, Ohio, Pennsylvania, Minnesota, Ontario
Dusky Pygmy Rattlesnake
Sistrurus miliarius barbouri
United States of America
Florida, Georgia, Alabama, southeastern Mississippi, extreme southeastern South Carolina
Arizona Ridge-nosed Rattlesnake
Crotalus willardi willardi
United States of America
Arizona
Hopi Rattlesnake
Crotalus viridis nuntius
USA
Utah, Arizona, New Mexico
Yucatan Neotropical Rattlesnake
Crotalus tzabcan
Mexico, Belize, Guatemala
Quintana Roo (MX), Campeche (MX), Yucatán (MX), El Petén (GT), Belize (BZ), Cayo (BZ), Corozal (BZ), Orange Walk (BZ), Stann Creek (BZ), Toledo (BZ)
Central Plateau Dusky Rattlesnake
Crotalus triseriatus triseriatus
Mexico
Michoacan, Morelos, Mexico, Puebla, Veracruz
Cross-banded Mountain Rattlesnake
Crotalus transversus
Mexico
México and Morelos
Tancítaran Cross-banded Mountain Rattlesnake
Crotalus tancitarensis
Mexico
Michoacán
Panamint Rattlesnake
Crotalus stephensi
United States of America
California, Nevada
Sinaloan Long-tailed Rattlesnake
Crotalus stejnegeri
Mexico
Sinaloa
Red Diamond Rattlesnake
Crotalus ruber ruber
United States of America
California
Central American Rattlesnake
Crotalus simus
Mexico, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica
Chiapas (MX), Tabasco (MX),
Tancitaran Dusky Rattlesnake
Crotalus pusillus
Mexico
Michoacán, Jalisco, possibly extreme northwestern Colima
Western Twin-spotted Rattlesnake
Crotalus pricei pricei
United States of America
Arizona
Horsehead Island Speckled Rattlesnake
Crotalus polisi
Mexico
Baja California
Northern Pacific Rattlesnake
Crotalus oreganus oreganus
United States of America
California, Oregon
Tamaulipan Rock Rattlesnake
Crotalus morulus
Mexico
Tamaulipas, Nuevo-Leon, Coahuila
Northern Black-tailed Rattlesnake
Crotalus molossus molossus
United States of America, Mexico
Texas (US), New Mexico (US), Arizona (US), Sonora (MX), Chihuahua (MX) and Coahuila (MX)
Southwestern Speckled Rattlesnake
Crotalus pyrrhus
United States of America
California, Arizona, Nevada, Utah
Banded Rock Rattlesnake
Crotalus lepidus klauberi
United States of America, Mexico
Arizona (US), New Mexico (US), Texas (US), Chihuahua (MX), Durango (MX), Zacatecas (MX), Jalisco (MX)
Totalcan Small-headed Rattlesnake
Crotalus intermedius intermedius
Mexico
Hidalgo, Puebla, Veracruz, Tlaxcala
Isla San Esteban Rattlesnake
Crotalus estebanensis
Mexico
Sonora
Guerreran Long-tailed Rattlesnake
Crotalus ericsmithi
Mexico
Guerrero
Cerralvo rattlesnake
Crotalus enyo cerralvensis
Mexico
Baja California Sur
Aruba Island Rattlesnake
Crotalus durissus unicolor
Netherlands (Aruba)
Aruba
Northwestern Neotropical Rattlesnake
Crotalus culminatus
Mexico
Michoacán, Morelos, Guerrero, Oaxaca, México, Puebla
Colorado Desert Sidewinder
Crotalus cerastes laterorepens
United States of America
Arizona (US), California (US), Baja California (MX), Sinaloa (MX)
Louse Island speckled rattlesnake
Crotalus thalassoporus
Mexico
Baja California
Campbell's Rattlesnake
Crotalus campbelli
Mexico
Jalisco, Colima, Nayarit
Mexican West-Coast Rattlesnake
Crotalus basiliscus
Mexico
Sonora, Sinaloa, Nayarit, Jalisco, Colima, Michoacan, Oaxaca
Western Diamondback Rattlesnake
Crotalus atrox
United States of America
Texas (US), Oklahoma (US), Arkansas (US), New Mexico (US), Arizona (US), Nevada (US), California (US), Baja California (MX), Sonora (MX), Chihuahua (MX), Coahuila (MX), Nuevo Leon (MX), Tamaulipas (MX), Sinaloa (MX), Durango (MX), Zacatecas (MX), San Luis Potosi (MX), Hidalgo (MX), Veracruz (MX), Guanajuato (MX), Queretaro (MX), Puebla (MX) Disputed - Kansas (US)
Mexican Dusky Rattlesnake
Crotalus armstrongi
Mexico
Jalisco, Nayarit
Queretaran dusky rattlesnake
Crotalus aquilus
Mexico
Guanajuato, Hidalgo, México, Michoacán, Aguascalientes and San Luis Potosí
Isla Angel Rattlesnake
Crotalus angelensis
Mexico
Baja California
Western Massasauga Rattlesnake
Sistrurus tergeminus
United States of America
Arizona, Colorado, Iowa, Kansas, Missouri, New Mexico, Oklahoma, Texas
Mohave (Mojave) Rattlesnake
Crotalus scutulatus scutulatus
United States, Mexico
Arizona (US), California (US), Nevada (US), New Mexico (US), Texas (US), Utah (US), Chihuahua (MX), Sonora (MX), Durango (MX), Coahuila (MX), Zacatecas (MX), Nuevo Leon (MX)
Eastern Diamondback Rattlesnake
Crotalus adamanteus
United States
Alabama, Florida, Georgia, Louisiana (likely extirpated), Mississippi, South Carolina, North Carolina (extremely rare)