The Gravity Falls forest is a large wooded area that surrounds most of Gravity Falls, Oregon. It is also the home to a variety of mystical creatures, such as Gnomes. It was the hiding place of the book 3, until the book was discovered by Dipper Pines. Dipper stated that he felt like he was being watched in the forest.
In "Tourist Trapped," Grunkle Stan told the employees of the Mystery Shack to go and put up signs in the forest to advertise The Mystery Shack. After a while, Dipper was elected as the one to put them up, and begrudgingly ventured into the forest to do so. In the forest, while Dipper was nailing up the signs, he discovered that one of the trees made a metallic ringing sound as the nail was hammered in. He then discovered a secret panel in the fake tree, which uncovered a strange box with two switches on it, one of which revealed the hiding place of the book 3.
Later on, the Gnomes, who were disguising themselves as a teenage boy named Norman, brought Mabel Pines here to attempt to force her to marry them and become their gnome queen. Dipper used the Mystery Cart to save Mabel, and they fled the forest to fight the gnomes at the Mystery Shack.
Part of the forest contains Height altering crystals, as shown in "Little Dipper." These crystals have caused legends of tiny buffalo and giant squirrels, and has created miniature deer, gigantic butterflies, and giant caterpillars. Dipper takes one of the crystals and uses it to make the shrinking flashlight.
The Gravity Falls forest is the setting for a level in the game, "Fright Night."
Dipper captures a Gremloblin out of the forest to bring into the exhibit of the Mystery Shack, to show something that wasn't one of Stan's hoaxes, even though everybody else thought it wasn't real.
- 101. "Tourist Trapped"
- 106. "Dipper vs. Manliness"
- 111. "Little Dipper"
- 113. "Boss Mabel"
- 114. "Bottomless Pit!"
- In Rumble's Revenge, the forest appears to contain "acorn-spitting stumps."