How old do rabbits have to be before they can mate?

5-6 months old

The does (female rabbits) have to be 5 months old and the bucks (male rabbits) have to be 6 months old.

Rabbits should be at least 6 months old and be mature weight before they are bred. If you do not know what your rabbit's mature wight is go to arba.org to find out.
Atleast 2 yrs old