Many Brachypelma were described relatively recently, the 1990s and early 2000s; Brachypelma baumgarteni (Smith, 1993) is one of them. B. baumgarteni comes from the Mexican state of Michoacán. Specimens have been found in the northern foothills of the southwest mountain range, Sierra Madre del Sur. Smith reports the highest elevation in this region at 2,896 ft, with climate more arid (summer ~82 F, burrow cooler by degrees) than on coastal wooded slopes at lower elevations. 
Along with Brachypelma auratum, the distribution of B. baumgarteni is restricted compared to the more common members of the group, accounting in part for its relative scarcity. CITES classification and sustainable captive breeding efforts in Mexico allow export on a semi-regular basis.
Growth, maximum size, and keeping parameters are as for the other red-legged members.
Photo above courtesy Dr. Jorge Mendoza.
 Smith, A. M. (1993a). A new mygalomorph spider from Mexico (Brachypelma, Theraphosidae, Arachnida) Brachypelma baumgarteni Nsp. British Tarantula Society Journal 8(4): 14-19.