Fair enough, I'll reiterate the sizes more based on my research and personal experience:
5-6' norm for males, 6-8' for females. Smaller exceptions (4+ feet) and larger (8+ feet) are found but are uncommon based on what I've seen.
Smaller locales than Colombians include Nicaraguans, Mexican Dwarf Boas, and Island dwarf locales and larger include the BCC boas like Peruvians, Surinames, and Guyanas, and the BCOs which are Argentine boas.