I've already listed some fall items AND Christmas items. You have to factor in the time it will take for someone to get the item (1-2 weeks for shipping, especially if it is a custom item), so it is better to give everyone plenty of time to find your things.
You can also use the "Rearrange your Shop" option to put Christmas items towards the end of your page, and fall things closer to the top, that way your customers won't be bombarded by a bunch of fall and Christmas stuff right at the top.