Mandevilla is a tropical but it appears in garden centers here around mid-May. If you work this into your gardening plan next year, don't get all in a hurry to plant it too early because overnight temperatures need to consistently be at or above 55F otherwise it may never have a chance. So if you do buy early, keep it indoors for a while.
For whatever reason, my mandevilla was slow to climb this year. Although it was producing plenty of blooms, it didn't really start to take off until mid-August. That was not the case for my friend Chris who lives in Pennsylvania so I have no idea what to attribute it to. Nevertheless, it is looking great and I fully expect it to last until frost.
Mandevilla can be overwintered inside, which I have never done because I have nowhere to put it. But if you try it, be sure to spray it thoroughly with insecticidal soap so that you get to all the bugs living in the nooks and crannies. Then keep it in a room that has a window so there is light exposure. Chris uses her laundry room. As sad is it will start to look throughout the winter, I have it on good authority that it will bounce back when spring returns.
So if you're short on space, my suggestion would be to try growing up.
Bookshelf: Container Gardening Books