There is a special kind of engineering magic in watching a stadium roof glide open before a game, transforming an enclosed arena into an open-air ballpark in a matter of minutes. Retractable-roof stadiums offer the best of both worlds: shelter from rain, snow, and brutal heat when needed, and the classic open-sky experience when the weather cooperates. They are among the most impressive structures in modern sports.
In Major League Baseball, seven ballparks have retractable roofs, from Toronto’s pioneering Rogers Centre to the newest, Texas’s Globe Life Field. The NFL has five, and other sports, especially tennis, have adopted the technology too. Each roof is an engineering marvel in its own right, with designs ranging from sliding panels to fabric petals, and operating times that range from under five minutes to nearly half an hour.
The chart below is a complete guide to retractable-roof stadiums: every MLB ballpark, the NFL venues, other notable arenas, how fast each roof moves, and the records. Take a look, then we’ll get into the details.
Contents
The seven MLB ballparks with retractable roofs
Major League Baseball has seven ballparks that can open and close their roofs: Rogers Centre in Toronto, Chase Field in Phoenix, T-Mobile Park in Seattle, Minute Maid Park in Houston, American Family Field in Milwaukee, loanDepot park in Miami, and Globe Life Field in Arlington, Texas. They split neatly into two groups by purpose. The southern parks, in Phoenix, Houston, Miami, and Arlington, primarily use their roofs to escape brutal summer heat and humidity, while the northern ones, in Toronto, Seattle, and Milwaukee, guard mainly against rain and cold.
Interestingly, the teams in the hottest climates use their roofs the most, often keeping them closed for air conditioning even on dry days. Miami’s loanDepot park is the extreme case, playing under an open roof only a handful of times across entire seasons because of the near-daily summer thunderstorms and relentless humidity. It is a reminder that a retractable roof is about comfort as much as keeping the rain out.
The pioneer: Toronto’s Rogers Centre
The whole concept started in Canada. Rogers Centre, originally known as the SkyDome, opened in 1989 as the first stadium anywhere in the world with a fully retractable motorized roof. Its design uses panels that slide on tracks past one another, opening or closing in roughly 20 minutes. It was a genuine engineering landmark, and it remains the largest-capacity retractable-roof ballpark in MLB, as well as the only one regularly used for both baseball and other major events.
After Rogers Centre proved the concept, the technology spread quickly through the late 1990s and 2000s as new ballparks opened in hot or rainy climates. Chase Field followed in 1998, then a wave of parks in Seattle, Houston, and Milwaukee. The newest is Globe Life Field, which opened in 2020 to give the Texas Rangers relief from years of games in triple-digit heat. Notably, one indoor MLB park does not belong on this list: Tropicana Field has a fixed, non-retractable dome.
The NFL’s five retractable roofs
Football has embraced the technology too, with five NFL stadiums featuring retractable roofs: NRG Stadium (Texans), State Farm Stadium (Cardinals), Lucas Oil Stadium (Colts), AT&T Stadium (Cowboys), and Mercedes-Benz Stadium (Falcons). NRG Stadium led the way in 2002 as the first NFL venue with a retractable roof, using two panels that meet at the 50-yard line. The most visually striking is Atlanta’s Mercedes-Benz Stadium, whose roof is built from eight triangular “petals” that open like a camera aperture.
The NFL regulates roof use to prevent any competitive advantage: the home team must tell the head referee whether the roof will be open or closed at least 90 minutes before kickoff, and it must be set in that position no later than an hour before the game. Two desert teams have taken the climate-control idea even further, the Cardinals and the Raiders can roll their entire natural-grass playing fields in and out of their stadiums on massive trays.
Beyond baseball and football
Retractable roofs are not unique to American football and baseball. Tennis, in particular, has adopted them aggressively to protect its marquee events from rain delays. All four Grand Slam tournaments now have at least one covered court: Arthur Ashe and Louis Armstrong stadiums at the US Open, Centre Court at Wimbledon, and Rod Laver Arena at the Australian Open. Rugby’s Principality Stadium in Wales is another famous example, with a roof that can be closed for big internationals.
Each of these roofs solves the same fundamental problem, the unpredictability of weather, while preserving the option of open-air play. The designs vary enormously, from sliding panels to folding fabric to the petal system in Atlanta, but they all share the goal of giving organizers control over the one variable no sport can otherwise command: the sky.
The engineering of opening the sky
The speed at which these roofs operate is a point of real engineering pride and varies widely. Chase Field’s roof is among the fastest in baseball, closing its nine-million-pound structure in roughly five minutes thanks to a powerful drive system. At the other end, Globe Life Field’s roof takes around 24 minutes. In the NFL, NRG Stadium opens in about seven minutes, while AT&T Stadium and Lucas Oil Stadium each take around 11 minutes to move their multi-million-pound panels.
These structures are staggering feats of engineering, with roofs weighing millions of pounds yet gliding open smoothly on tracks and drive systems. They are not without occasional drama, high winds have caused issues during roof operations, which is why teams typically open or close them well before fans arrive. But when one of these roofs slides open to reveal a clear sky just before first pitch or kickoff, it is one of the most impressive sights in all of sports.
Final Word
Retractable-roof stadiums represent the perfect marriage of tradition and technology: open-air sports when the weather is nice, and full shelter when it is not. Major League Baseball has seven, led by the pioneering Rogers Centre and the newest Globe Life Field, while the NFL has five and tennis has embraced the concept across all four Grand Slams. Each roof is a unique engineering achievement, from Chase Field’s five-minute close to Atlanta’s eight-petal aperture.
As stadium technology continues to advance, retractable roofs have become a sought-after feature for any new venue in a challenging climate, guaranteeing that the game goes on no matter what the sky is doing. The next time you watch a game beneath one, take a moment to appreciate the marvel overhead. For more on baseball’s most storied venues, see our list of the oldest MLB stadiums.