I assume by 'red tail' you mean Colombian BI and not 'true red tail' BC?
Boas will continue to grow their entire lives. Having the CA blood in the mix, the boa is likely to stay on the smaller size but it's no guarantee. Also at one year and already 3', there's some potential for growth there for sure. I'd say 6' but could go up to 8' as a total guess. Growth depends on a lot of factors and heavier feeding when younger will lead to a larger snake once it's mature. Males do stay smaller over all as shaft noted above.
Good luck with your boa!
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