Keeping large handled tools, such as sledge hammers- and axes-, hung up on a wall surface keeps them neat and handy. To hang, drill a hole crosswise in the handle an inch or so from the end so the head will be flat against the wall. Since the hole is near the end, it won't weaken the handle.
Before the temperatures start to dip toward freezing, be sure to disconnect hoses from outdoor water faucets and drain all excess water from them before storing for the winter to protect pipes from freezing. Close valves that lead to outdoor faucets and open the faucets outside to allow for drainage.