Christmas lights

I love Christmas lights as do most Minnesotans. I think it has something to do with how little light we have during the winter months. In the past year or two, I've seen neighbors put a string of lights in their backyard as well as any they have displayed in the front. It was an idea I loved right away.....lights that were for your alley neighbors, not just the cars driving past in front. So this afternoon...one of our first truly cold and windy days....I unwound little white lights, stringing them along the fence from my house to my garage. One of the unexpected delights is that I can see them from my workspace in the house, twinkling through the bushes.
And no, that's not snow. I still haven't raked the leaves. Is it a bad thing to put lights up before the leaves are raked?