Sorry, there's no context to your question. Where are you growing it? What species of aloe is it? (There are several hundred species, with varying tolerances to cold.) A picture would help also. Aloe cameronii and aloe microstigma, for example, turn red with cold temperatures and sun exposure. Aloe vanbalenii turns orange/yellow. Aloe maculata and retizii get purple overtones. This type of coloration doesn't harm the plants.

Just to give you an example of this type of stress-induced coloration, here is an aloe vanbalenii I have in full sun. This is a perfectly healthy plant. If yours looks like this then there is nothing to worry about.

It does sort of look like that. it was green, but got chilled, and so thought the cold killed it. It does have some green down in the middle..