Dear Dr. Baum–
What age can I let my kitten outside safely? His name is Dusty.
Dear Linda —
He can start going outside as soon as his vaccinations are completed. As an indoor/outdoor cat he should be tested for FELV / FIV viruses and then receive FVRCP/FeLV vaccines at 8, 12 and 16 weeks. Depending on the Rabies situation in your area, he could possibly need a Rabies vaccine at 4 months of age. But before letting him out, you should consider the perils that will be encountered — other cats, predators (animal and human) as well as automobiles. A rural environment is more conducive for a happy existence as an outdoor cat. The more that you create an interesting, fun environment in your house, the more content your kitty will be as an inside cat.
NOTE: For another take on the question, see also, At what age can I safely let my kitten out? From a kitten owner in the U.S.