Coasterpedia:On this day/05 20

2023	Matugani, a steel launched roller coaster manufactured by Intamin, opens at Lost Island Theme Park in Waterloo, Iowa, USA Screaming Eagle, alpine coaster manufactured by Wiegand, opens at Ruidoso's Winter Park in Ruidoso, New Mexico, USA
2017	Fireball, a steel shuttle roller coaster manufactured by Vekoma, opens at Furuvik in Gävle, Gävleborgs, Sweden Joker, a steel 4th dimension roller coaster manufactured by S&S Worldwide, opens at Six Flags Over Texas in Arlington, Texas, USA
2016	Fireball, a super loop ride manufactured by Larson International, opens at Six Flags New England in Agawam, Massachusetts, USA
2009	ISpeed, a steel launched roller coaster manufactured by Intamin, opens at Mirabilandia in Savio, Emilia-Romagna, Italy
2005	Queen City Stunt Coaster, a steel launched roller coaster manufactured by Premier Rides, opens at Kings Island in Mason, Ohio, USA
2001	Wildcat, a steel roller coaster manufactured by Schwarzkopf, opens at Williams Grove Amusement Park in Mechanicsburg, Pennsylvania, USA
2000	Six Flags New Orleans opens with 14 rides in New Orleans, Louisiana, USA
1995	Professor Screamore's SkyWinder, a steel inverted roller coaster manufactured by Vekoma, opens at Six Flags America in Upper Marlboro, Maryland, USA
1976	California's Great America opens with 11 rides in Santa Clara, California, USA
1973	Coal Cracker, a log flume ride manufactured by Arrow Development, opens at Hersheypark in Hershey, Pennsylvania, USA
1963	Dutch Wonderland opens in Lancaster, Pennsylvania, USA
1958	unknown, a steel kiddie roller coaster, opens at Amusementspark Tivoli in Berg en Dal, Gelderland, Netherlands