Costa Rican Boa imperator represents a distinct and underappreciated locality within the species, with verified specimens of pure Costa Rican origin being increasingly rare in captive collections. These boas exhibit morphological and genetic traits that differentiate them from other Central American populations, particularly in terms of overall body size, scalation, and pigmentation. While Costa Rican Boas have historically received less attention than their Nicaraguan or Colombian counterparts, their unique phenotype, moderate adult size, and historical significance make them a valuable component of conservation-focused breeding programs.  

Historically, the number of verifiable Costa Rican Boas in the U.S. has remained extremely limited due to restricted exportation and inconsistent documentation of wild imports. Only a few documented shipments of pure Costa Rican Boas have entered the herpetocultural trade, with many of these animals originating from zoological institutions and research facilities rather than large-scale commercial exports. Within these importations, two primary regional variants have been identified—one originating from the northwestern Guanacaste Province near Liberia and another from the southwestern region around San Isidro El General.  

The San Isidro population is characterized by a predominantly gray-brown base coloration with a high degree of orange undertones, particularly in subadults and juveniles. Some individuals within this locality exhibit hypomelanistic tendencies, with reduced black pigmentation and an enhanced expression of red within their dorsal and caudal patterning. These boas have been documented with naturally occurring variations in melanin concentration, though no confirmed recessive or dominant hypomelanistic trait has been officially established within this population.  

The boas from the Liberia region of Guanacaste Province, however, represent a particularly significant and exceptionally rare locality. These boas exhibit a distinct combination of compact body structure, reduced maximum adult length, and enhanced vibrancy in coloration compared to other mainland Boa imperator populations. Liberia boas exhibit a natural size limitation, with most adults reaching reproductive maturity at lengths of approximately four to five feet, significantly smaller than the more commonly encountered mainland lineages. This suggests a form of localized dwarfism, potentially driven by ecological pressures such as limited prey availability and environmental constraints. Despite their smaller size, these boas maintain robust body proportions, with well-defined dorsal saddles and a pronounced contrast between their lighter ventral surface and darker dorsal patterning.