When is too soon for Christmas Lights? As a standard I say wait until Thanksgiving weekend to put up the lights but I myself couldn’t resist the mild weather this weekend so I went ahead and put up my lights. Granted I will not turn them on until Thanksgiving, but they’re ready to go. In my neighborhood I did see houses fully decorated. Why not, 1 out of 3 commercials you see are Christmas commercials and local radio stations have started round the clock Christmas music (too soon for me, just sayin').