It depends on what kind of shoes you wear and how much you can tolerate little pebbles in them. Some shoes allow more small rocks to enter them than others do. If you don't usually have a problem with it, then I'd say don't sweat it. However, since you're asking, it's clearly a concern for you and addresses the second issue I mentioned of tolerance. Go ahead and wear them. It's better to have them if you're unsure. It wouldn't hurt. There are some spots with a lot of tiny pebbles along the trail and it definitely bothers some people.