I'm not sure what your using for posts and I'm assuming you mean the ground freezes and the posts start to move because the ground can't hold them in place anymore. You should be using 4x4 pressure treated posts and a lot of them depending how big your car port will be. You to dig about 2 foot holes only about 6-8 inches around for each post and then you need to pour concrete in each hole around the post (Note:make sure the post is straight and stays straight).
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