Yes, Mandalay Bay in Las Vegas heats its pools, but not all of them remain open during the winter months. The iconic Mandalay Bay Beach (including the sand-bottom wave pool and lazy river) typically undergoes seasonal maintenance or has very limited hours from November through February. However, the resort always keeps at least one or two of its smaller pool lagoons heated to approximately 80°F–84°F (27°C–29°C) for year-round swimming. In 2026, the neighboring Stadium Swim at Circa (downtown) has set a new Vegas standard for "winter swimming" by heating its massive pools to 94°F–103°F, forcing many Strip resorts like Mandalay Bay to be more consistent with their heating. If you are visiting in the winter, it is always best to call the concierge a few days before arrival to confirm which specific pools are active, as high winds or extreme temperature drops can occasionally lead to temporary outdoor pool closures for guest safety.