Valleyfair opened on May 25, 1976, featuring 20 rides and attractions on , with the roller coaster High Roller being the main attraction. The carousel in the park came from
Excelsior Amusement Park which was closed in 1973. It is the oldest ride in the park. In 1978 in an effort to increase investment capital for continued park expansion, Valleyfair was acquired by
Cedar Point in
Sandusky, Ohio. Five years later, Cedar Fair Limited Partnership was formed as the parent company for Cedar Point and Valleyfair (the name being derived from the names of both properties). Since 1976, Valleyfair has invested over $96 million into the park, and today the park has over 75 attractions on of land. A height restriction was imposed in 2000 with the building of the
Power Tower. After negotiations with the FAA and the nearby Flying Cloud Airport, the FAA restricted the building height of the Power Tower at due to its proximity to the airport. Power Tower's original plan was to be a height of and to take riders to . Valleyfair did not open for the 2020 season because of the
COVID-19 pandemic in the United States, although it was reopened for the 2021 season. On July 1, 2024, a merger of equals between
Cedar Fair and
Six Flags was completed, creating Six Flags Entertainment Corporation. This officially retired the Cedar Fair branding that was partially derived from Valleyfair. On March 5, 2026, Six Flags announced it would sell Valleyfair as part of a $331 million sale of seven parks in total to
EPR Properties. Completed on April 6, 2026, the new operator of Valleyfair is
Enchanted Parks. Valleyfair will retain its branding for the rest of 2026. As the park is located on the banks of the
Minnesota River, flooding can become an issue during the springtime months before the park usually opens (or when the park is open for the season), notably in 1988, 1993, 1997, 2014, 2018, 2019, and 2024. Excalibur and Thunder Canyon are built outside of a pre-existing river dike, and were built with this flooding potential in mind.
Attraction timeline • 1976: Valleyfair opens with Antique Cars, Bumper Cars, Carousel, Ferris Wheel, Flying Trapeze,
High Roller, Scrambler, SuperCat, and Wheel of Fortune • 1977: Monster, Tilt-A-Whirl and Giant Tilt Ride (The only Super Tilt Model 14-car Tilt-A-Whirl ever built by Sellner Manufacturing) open • 1978: Ye Olde Log Flume opens • 1979: Enterprise, Kiddie Ferris Wheel and Wild Rails open • 1980:
Corkscrew opens • 1981: Tot Town opens • 1982: Pepsi
IMAX theater opens, New entrance marquee • 1983: Three water slides (now known as Panic Falls Body Slides) open • 1985: The Looping Starship and Bayern Curve open • 1987:
Thunder Canyon opens • 1988: Two water slides (now known as Panic Falls Speed Slides) and Half Pint Park open • 1989:
Excalibur opens • 1990: Minnesota River Valley Railroad opens • 1991: Phase one of
Challenge Park opens • 1992: The Wave opens and two 18-hole golf courses added to Challenge Park • 1993: Whitewater Country water park expansion; Bumper Boats added to Challenge Park • 1994: Berenstain Bear Country opens • 1995: Hydroblaster opens • 1996:
Wild Thing opens; RipCord added to Challenge Park • 1997: Chaos opens • 1998: Galaxy Theater opens • 1999:
Mad Mouse opens • 2000:
Power Tower and Frog Hopper open • 2003:
Steel Venom opens • 2004: Foam Ball Factory and The Rockin' Tug added to KidWorks • 2005: RipTide and Skyscraper open • 2006:
Xtreme Swing opens and Halloween Haunt occurs for the first time. • 2007:
Renegade opens • 2008: Halloween Haunt is renamed Halloween Haunt at
ValleyScare • 2009: Re-theme of the water park to
Soak City • 2011:
Planet Snoopy opens • 2012:
Fast Lane; Antique Cars closes • 2013:
Dinosaurs Alive! • 2014: Route 76: Northern Lights opens, Scrambler and Tilt-A-Whirl relocated and Antique Cars to be re-added as Antique Autos; Pepsi
IMAX theater and hydroblaster closes • 2015: Soak City: New Slide Tower, New Children's Splash Pad; Subway relocated, Airbrush Tattoo stand closed • 2016: Flying Eagles, All Wheels Extreme (Upgraded Amphitheater), New High Roller Trains, Subway Takes Place of Ben and Jerrys, 40th Anniversary Events, Enterprise closes • 2017: North Star, a
Funtime Starflyer swing ride, opens for 2017, New Caribou plaza • 2018: Delirious, Larson International super loop, RipTide closes, New light package for Route 76, Snoopy's bounce house is removed, Free WiFi throughout the park. • 2019: Superior Stage opens to host Peanuts Celebration, Updated Bathrooms, Variety of new food options,
Dinosaurs Alive! and Looping Starship close. • 2021: Grand Carnivale, a new event, launches in the park. ValleyScare announces it is ending after the 2021 season. • 2022: TRICKS AND TREATS, a new event, launches in the park. • 2023: A Chaperone Policy is implemented at the park. • 2024: ValleySCARE's return is announced for the 2024 season. ==Attractions==