DistributionRead full entry
Ponderosa pine is the most widely distributed pine species in North America, ranging north-south from southern British Columbia to central Mexico and east-west from central Nebraska to the west coast . Ponderosa pine ecosystems occupy about 38 million acres across 14 states . The U.S. Geological Survey provides a distributional map of ponderosa pine.
Interior ponderosa pine's general distribution is from the eastern slope of the northern Rocky Mountains in Montana east to central Nebraska and Kansas and south to eastern Nevada, western Texas, and Mexico. The distribution continues south from Texas into Coahuila, Tamaulipas, and San Luis Potos, Mexico [81,82,274]. However, interior ponderosa pine is not a geographically distinct taxon . There is a broad zone of intergradation between interior and Pacific ponderosa pines in southeastern Idaho and on both sides of the Continental Divide in Montana and Wyoming [38,73,97,235,236]. Interior ponderosa x Arizona pine intergrades occur in southeastern Arizona, southeastern New Mexico, and Mexico [38,97,116,236]. On sky islands of southeastern Arizona, interior ponderosa pine mostly occurs above 7,000 feet (2100 m) elevation. A transition zone of intergraded interior ponderosa pine × Arizona pine occurs between 5000 and 7000 feet (1500-2100 m) .