After a closure that stretched a full 16 months — from January 6, 2025 to May 3, 2026 — Big Thunder Mountain Railroad is finally running again at Magic Kingdom. If you're planning a Walt Disney World trip in the next few months, there's more you need to know than just "it's open again." A few of the changes genuinely affect how you should build your day, and one of them — an Early Entry detail — trips up more visitors than anything else about this reopening.
What Actually Got Rebuilt
The headline work was a full track replacement and new passenger trains, and it shows: the ride is noticeably smoother than the increasingly rattly version guests rode before the closure. Beyond the mechanics, Imagineers added an entirely new scene. The trains now dip underground into Rainbow Caverns, a glowing, phosphorescent cave sequence with fiber-optic lit stalactites and stalagmites — a direct callback to Disneyland's Mine Train Through Nature's Wonderland, an attraction that closed all the way back in 1977. It's a deep-cut reference most riders will miss entirely if they're bracing for the drops instead of looking around.
The Height Requirement Actually Changed
Here's a detail that matters more than it sounds like it should: the height requirement dropped from 40 inches to 38 inches. Two inches doesn't sound like much, but in practical terms it means kids can ride Big Thunder Mountain up to 12-18 months earlier than they could before. If you ruled this ride out for an upcoming trip because of your child's height, it's worth checking again.
The Detail Almost Nobody's Talking About
This is the part that actually matters for your trip plan: Big Thunder Mountain Railroad is NOT part of Early Entry, the 30-minute early theme park entry perk available to Disney Resort hotel guests. It's an easy assumption to make — it's a headline attraction, it's back after a huge closure, surely it's part of the early access lineup. It isn't. If you spend your Early Entry window walking to Big Thunder Mountain, you'll find it hasn't opened yet, while everyone using Early Entry correctly is already clearing Peter Pan's Flight, Seven Dwarfs Mine Train, or another Early Entry attraction.
What Wait Times Actually Look Like Now
Opening day was rough — the posted standby wait hit two hours by 9:30 a.m., and every Lightning Lane Multi Pass slot for the entire day was gone by 9:11 a.m. That was opening-day demand, not the new normal. Big Thunder Mountain is back in Magic Kingdom's Tier 1 Lightning Lane Multi Pass lineup, alongside Peter Pan's Flight, Jungle Cruise, Tiana's Bayou Adventure, and Space Mountain — Disney's most in-demand tier. In regular day-to-day operation, standby waits typically run under an hour outside of the first hour or two after rope drop, when it can still spike well past that.
Building It Into Your Day
Because Big Thunder Mountain isn't on Early Entry, the smartest sequence is to spend your Early Entry window on a ride that is covered by it, then head straight to Big Thunder Mountain the moment regular park hours begin — before the standby line builds. This matters even more right now, since Cool Kids' Summer is running across all four parks through September 8, 2026, keeping Magic Kingdom crowds elevated all season.
Frequently Asked Questions
Is Big Thunder Mountain Railroad part of Early Entry?
No. It is not included in the 30-minute early theme park entry perk for Disney Resort hotel guests.
What is the current height requirement for Big Thunder Mountain Railroad?
38 inches, down from the previous 40-inch requirement.
Is Big Thunder Mountain Railroad a Lightning Lane Multi Pass ride?
Yes — it's back in Magic Kingdom's Tier 1 Lightning Lane Multi Pass lineup.
What's new about the ride experience itself?
A full track and train replacement for a smoother ride, plus a new underground scene called Rainbow Caverns.
How long was Big Thunder Mountain Railroad closed?
16 months — from January 6, 2025 to May 3, 2026.
Conclusion
Big Thunder Mountain Railroad's reopening is genuinely good news for Walt Disney World planning — a smoother ride, a lower height bar, and a new scene worth watching for. Just don't let the excitement cost you your Early Entry window. Want a full system that maps out exactly which rides are covered by Early Entry and which aren't, so a detail like this never blindsides your morning again? Grab the Walt Disney World First-Timer's Complete Planning Guide for $37 at payhip.com/b/xSRbZ, or start with the free 7 Disney World Money Hacks guide at eepurl.com/sWs3ANT4ta.