I know I have read that yellow jackets die off during the winter and the nest is not rebuilt but a new one is built every year and only the queen survives the winter. However I have seen and read about huge yellow jacket nests being dug up by bulldozers and I have seen the video of the 6 foot tall yellow jacket nest found in Florida. I don't think those huge nests could possibly have been built in a year or even a few years. I can't account for how the nests get so large, but I think it best to destroy them while the nest is still small and not give them a chance to get huge with thousands or tens of thousands of stinging yellow jackets.