At between years Boa constrictors become sexually mature and will have reached the adult size of between ft, although they will continue to grow at a slow rate for the rest of their life. At this point they will shed less frequently, approximately every months. Colombian Red Tail Boas (Boa constrictor imperator) - Red Tail Boas will generally grow to an average length of 6 - 10 feet (females being larger than males) and can live up to 25 - .
Nov 04, · Boa Constrictor Size. Female Colombian boa constrictors may reach 10 feet in length, though this is rare for B. c. imperator, and the average adult size for females is usually 6 to 8 feet. Males are smaller, usually 5 to 7 feet in length.