There are a couple of winter factors that can harm your motorcycle. Water, temperature and sun.
The ideal storage, of course, is a closed in facility like a garage or shed. Keeping it out of the wind, rain/snow and sun will give your bike a longer life and keeping it lasting longer.
I have a 2004 Honda VTX 1300S, with over 80,000 miles on it. By keeping it stored in a garage, it looks the same as when I drove it off the dealer’s showroom.When on long cross-country trips, I’ll cover the bike during the night stay-overs. By covering it, it not only keeps the weather off of it, it is also a deterrent to theft.
When storing the motorcycle, it is important to keep the battery plugged into a battery tender or trickle charger. It is also a good practice to go out and start it up once a month to keep the oil lubricating all the internal moving parts. It also keeps me motivate and looking forward to the spring, when I climb on the bike and start it up.
Another factor to consider is that by garaging your motorcycle in a locked garage, you are improving your risk of it getting stolen. Motorcycles sitting out at the side of the house, or even in your backyard, make it enticing for thieves to haul it away. I have a relative who had his motorcycle stolen from a parking lot. A couple of months later he was contacted by the police from a neighboring state saying that they had found his motorcycle. Problem was it wasn’t in one piece. the thief had wrecked it and also broke it down to sell off the parts.
So, keep your motorcycle safe. Keep it garaged.