If you’ve taken a spin on Big Thunder Mountain Railroad recently, you’ve likely noticed that the view from the second lift hill has changed drastically. The peaceful, winding waters of the Rivers of America are gone, replaced by a massive expanse of dirt, heavy machinery, and—as of late April 2026—vertical steel.
Construction on Piston Peak National Park, the highly anticipated Cars-themed expansion “Beyond Big Thunder,” has officially reached a major structural milestone. According to new reports from WDWNT, crews have begun installing massive steel supports for a permanent boundary wall that will physically and thematically separate the 1880s mining town of Frontierland from the rugged, off-road wilderness of the new land.
Here is the latest update on the “Great Wall” of Frontierland and what this vertical progress means for the future of the Magic Kingdom.
The Thematic “Curtain” Rises
In the world of Imagineering, the “transition” is everything. You can’t simply have a high-tech off-road racer parked next to a steam-powered gold mine without a bit of narrative connective tissue. The steel supports currently being bolted into the ground are the skeleton of what will become a massive thematic boundary.
This wall isn't just for safety; it's a visual curtain that protects the “Disney Magic.” Once completed, the wall will likely be disguised with intricate rockwork and dense, artificial foliage to ensure that:
- Sightlines are preserved: Guests on Big Thunder Mountain won't see the modern-day “National Park” infrastructure, and guests in Piston Peak won't see the “backstage” areas of the mountain.
- Acoustic Isolation: Piston Peak is set to be a high-energy land filled with the sounds of revving engines. This wall will help dampen that noise, keeping the “Old West” audio of Frontierland intact.
Seeing these supports go up now is a clear sign that the “dirt-moving” phase of the project is wrapping up. We are now officially in the vertical construction phase.
What is Piston Peak National Park?
For those who haven't been tracking every permit, Piston Peak National Park is the official name for the Cars expansion, replacing Tom Sawyer Island and the Rivers of America. This isn't a carbon copy of Radiator Springs from California; it’s a rugged, mountainous park inspired by the great American wilderness.
The land will feature two primary attractions:
- The Off-Road Rally: An E-Ticket adventure where guests board high-performance vehicles to race through mountain trails, forest floor, and mud-slicked paths.
- The Family Attraction: A second, more accessible ride designed to ensure that the “National Park” has something for explorers of all ages.
Goodbye Rivers, Hello “Beyond Big Thunder”
The installation of these wall supports marks a “point of no return” for the Rivers of America. While the loss of the river and Tom Sawyer Island remains a bittersweet topic for many Disney traditionalists, the scale of the Piston Peak project is undeniably massive.
By filling in the riverbed and building this new boundary, Disney is significantly increasing the “active” capacity of the Magic Kingdom. Instead of a passive sightseeing area, the back of Frontierland is becoming a high-capacity destination that will help thin out the crowds in the rest of the park.
When Will It Open?
With vertical steel now rising in April 2026, the big question is the opening date. Historically, for a project of this scale involving massive rockwork and complex ride systems, the construction timeline is typically 24 to 30 months from the start of vertical work.
- 2026: Focused on the “mountain” structures and the boundary wall.
- 2027: Focused on ride system installation and interior theming.
- Early 2028: Testing, adjusting, and soft openings.
While Disney has yet to announce an official date, the current progress points toward a Summer 2028 grand opening.
The Bottom Line
The “Great Wall” of Frontierland is more than just a barrier—it’s the foundation for the biggest expansion in the history of the Magic Kingdom. As those steel supports are secured next to Big Thunder Mountain, they mark the beginning of a new era for the park.
If you're visiting in the next year, expect plenty of construction walls and cranes. But keep your eyes on that boundary wall; as the rockwork begins to cover that steel, the world of Piston Peak will finally start to look like the wilderness we’ve been promised.
Are you ready to trade the paddleboat for an off-road racer? Keep checking back as we track the rise of Piston Peak throughout 2026!
