is barts hair naturally red

only when he hasnt had much sun

no

He doesn't have a hair color, but if one were to make a guess, he would either be a brunette (Homer had brown hair) o he would have grey hair (Marge had grey hair, even though she was a brunette when she met Homer at camp, and she dyes her hair blue now)

if he has its never been on an episode

bart has a hair color?

Lemme answer that pregunta WITH a question:
Can pigs fly? XD

no he has no hair beacas it will be all fluffy like march hair

Bart Simpson is a natural blone.

Yeah his hair is naturally red, whch is brought out in the sun, although this is probably just a one time gag :P

the answer is whatever tu want it to be

Yes it is