Dome Advantages
Approximately half of NPB's 12 teams play in domes: Tokyo Dome (Giants), Kyocera Dome (Orix), Belluna Dome (Seibu), Vantelin Dome (Chunichi), PayPay Dome (SoftBank). Domes' primary advantage is weather independence with no rain cancellations. Climate control avoids summer heat and winter cold for comfortable viewing. Business stability from eliminated rain-cancellation revenue loss benefits team management. Of NPB's 12 teams, 5 use dome stadiums (Giants, Seibu, Nippon-Ham, SoftBank, Chunichi) while 7 use outdoor venues. Dome construction costs 50-100 billion yen with 2-3 billion annual maintenance, versus 10-30 billion for outdoor stadiums - a significant cost advantage.
Outdoor Appeal
Outdoor stadiums offer unique appeal: Koshien (Hanshin), Mazda Stadium (Hiroshima), ZOZO Marine (Lotte), Rakuten Mobile Park (Rakuten). Wind and temperature affect games - Koshien's Hamakaze and Marine Stadium's strong winds influence tactics. Open-air baseball's freedom is unavailable in domes. ES CON Field's retractable roof offers best-of-both-worlds design.
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Ballpark Game Impact
Stadium structure directly affects game outcomes. Tokyo Dome is known as homer-friendly with short fences and air-conditioning-aided ball carry. Koshien's Hamakaze suppresses right-handed homers. Stadium characteristics influence roster construction - homer-friendly parks emphasize power hitters while spacious parks prioritize pitching and defense.
Ballpark Future
NPB stadiums will continue evolving. ES CON Field's success established ballpark-type stadiums as NPB's trend. Aging stadium replacements and renovations progress with fan experience improvement as team priorities. Neither dome nor outdoor is definitively superior - each stadium's personality and appeal generate NPB's diversity. Stadiums are NPB cultural elements whose evolution shapes NPB's future.