I have spent many days and many hours in New Orleans, LA working on and studing termites. Termite swarms occur at different times of the day generally on the east coast of the U.S. Subterranean termites generally swarm in eary afternoon, drywood termites usually in late afternoon and Formosan termites in the evening. As an avid bug guy, I have to say that I love swarms. Whether its a Harvestor ant swarm or honeybees, I love them all. It is kind of funny, but many years ago when some of the termite baits came to the market and then Termidor came – many people thought that the termites would just go away. Never happened and probably never will. As great as those products are – the bugs continue to win.