Seafair Hydroplane Races 2025. The unlimited hydroplane season wraps up with the gold cup at seafair. Whether you watch from the shore or the seafair log boom, be prepared for an exhilarating experience with hydroplane racing speeds over 220 mph.
Reaching up to 220 mph. It all came down to one final heat, and j.michael kelly won the gold cup and the unlimited hydroplanes national title with his fifth win on lake washington at seafair.