I have a pair of Nicaraguan males that are 3 years old and almost 4 feet. I’m pretty sure they will top out about 4.5 feet at 5 years old. Females seem to be in the 5-6 foot range. Different localities of CA boas might be smaller or larger than others.

They were kinda edgy when I first got them but now they are totally chill and incredible animals. Feeding is never an issue and they have a bold personality. I can open the cage and clean and they won’t flinch. I have them in AP T-10’s