The Great Prosser Balloon Rally is an amazing opportunity to watch rainbow-colored hot air balloons take flight, up close and personal! Launches are scheduled for all three days (weather permitting) from the Prosser Airport. Spectators should arrive around 6:15am to watch the pilots prepare the giant balloons at sunrise. A Night Glow, where the balloons will be anchored and displaying their colors, will kick off at dusk Saturday evening at Fiker Stadium. Free admission.