I've always been interested in large snakes...(The burm is my favorite)...but I wanted to become familiar with other large snakes before advancing to the larger pythons...so I thought a boa constrictor would be a wise choice...upon my many hours of research online....I havnt been able to find answers to the following questions....I thank all who reply in advance...

1. What region of red tail boa gets the biggest?
2. What would the growth rate be?

You can't really refer just to red tail boa. The boa constrictor constrictor (actual red tail) grow slower and don't get as large as boa constrictor imperator or regular boa. boa constrictor imperator females can reach about 10ft, but are usually between 8 and 9ft. Males are 6-8ft. It's possible for boa constrictor constrictor reach the same lengths, but they grow slower. I would say on average a boa will be between 3-4ft in the first year. Around 5-7 by the second year or so. And then get to there adult size by 3 years. But remember they grow throughout life, growth just slows down dramaticly. I have a Columbian, thats a boa constrictor imperator. She is about a year and a half old and she is a little over 5ft.

This answer will probably require some research in order to find some consistent answers. I believe that Guyanan red tail boa's are among the largest of the RTBs. Surinames and Peruvians would be among the smaller, for example. This reference may provide a bit more clarity:

Localities

Almost all snakes will grow in direct proportion to feeding frequency. As far as Red Tailed Boas are concerned, many will put on the majority of their weight within the first year (to three years), as well as mature sexually within the first year, in many cases. Maturity (as adulthood would be measured) is generally achieved by the fifth year.

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Thanks alot guys....I appreciate the replies