Yes, you can upgrade your standard single-park ticket to a Park Hopper mid-day in 2026, but there are important caveats. At both Disneyland and Walt Disney World, you can visit a guest relations window or use the app to pay the flat-rate "Hopper" fee to add the ability to switch parks. However, the price is not pro-rated; you will pay the full multi-park fee regardless of how much time is left in the day. In 2026, Disneyland has removed the previous 11:00 AM restriction, allowing for much more spontaneous hopping. At Disney World, ensure your starting park reservation is validated before attempting to hop. It is often a "value-move" for guests who realize one park is unexpectedly crowded and want to pivot to another for the evening's fireworks or a dining reservation.