I found this ,
Yes, you may freeze yoghurt.Plain yoghurt is good, in that there are no other ingredients that can be affected by the freezing (and thawing) process. Remember, however, whenever you freeze anything (especially something that has a smooth texture, like yoghurt), that texture may be somewhat effected. With yoghurt, you will find that after you thaw it out, there will be a slight separation of the solids and the whey (liquid portion). You may either pour off some or all of the liquid, or stir it back in. Other than this factor, I do not