From Muppet Wiki

The Disneyland Resort is a theme park resort in Anaheim, California, run by the Walt Disney Company. The first park, Disneyland, opened on July 17, 1955. The second theme park in the resort, Disney's California Adventure, opened on February 8, 2001.

Muppet*Vision 3D, an elaborate attraction featuring a 3D film with animatronic effects, was introduced in Walt Disney World in 1991. The show is still a popular attraction in Disney World today, and it was recreated for Disney's California Adventure in 2001.

In 2004 Kermit and Miss Piggy hosted the Christmas Fantasy Parade from Disneyland for the television special "Christmas at Walt Disney World".

References

When Kermit hosted The Tonight Show in 1979, he mentions that The Muppets went to Disneyland, and that the guard at the gate refused to let them out.