"Brett's still out of it. I need to find his pack and warn them about the Deadpool." "So what do you need me for?" "I know a little something about this pack. They have a kind-of secret meeting place in the woods. No one's spent more time in the woods of Beacon Hills than you."
The Beacon Hills Preserve is a large nature preserve composed of a protected expanse of forest in Beacon Hills, California. Due to the large supernatural community in the town and the fact that the preserve is host to the Nemeton, a magical tree that was worshiped by the Celtic Druids and that acts as a beacon to supernatural creatures, the Beacon Hills Preserve is an important location in the Teen Wolf series, with numerous events occurring on the vast amount of space that the forest covers.
The preserve was formerly the home of Malia Tate, a Werecoyote who lived in her coyote form in the forest for over eight years until she was pulled back into her human form by Scott McCall and the McCall Pack; she lived in a small cave in the woods that she claimed as her coyote den until Scott and Stiles Stilinski invaded it. Other significant locations in the preserve include the Nemeton and its built-in root cellar (which is difficult to find, especially if the Nemeton doesn't want to be found), a small gardening shed, a larger transformer shed, Look-Out Point (the face of a cliff that overlooks all of Beacon Hills and the greater area surrounding it), a small footbridge, and a gate that leads to the extensive network of tunnels underneath the town. The exact size of the preserve is unknown, but it seems to run alongside many other Beacon Hills locations, such as the Hale House and the surrounding property; the high school; the main route in and out of Beacon Hills, Route 115; and the telecommunication towers, among many others.
Not only is the preserve regularly frequented by supernatural creatures, but it is also visited by Hunters on full moons, as they know that there is a greater chance of coming upon an out-of-control shapeshifter at this time and place. This forest is most notable for being the home of the mystical Nemeton and for being the location where Scott McCall was bitten and turned into a Werewolf by Peter Hale, which spawned the events of the Teen Wolf series into what it is today.
A few days later, Scott awoke in a coyote den in the preserve and realized that he had sleepwalked there. He was then chased by the Alpha, forcing him to jump in a neighbor's pool to evade him.
Scott and Stiles took a shortcut through the Hale property to return to the preserve in hopes of finding Scott's dropped inhaler. They're confronted by Derek Hale, who tossed the found inhaler to Scott and insisted they were on private property.
When Scott turned for the first time on the full moon a few days later, he ran into the preserve after catching Allison Argent's scent. However, upon reaching the woods, Scott realized that he had followed the scent of Allison's jacket, which had been used by Derek to lure him away from the party.
Three Hunters arrived and shot an arrow at Scott, pinning his arm against a tree until Derek freed him. Upon getting away, Derek explained that Scott was a werewolf and insisted that they were brothers now. ("Wolf Moon")
Scott broke out of his restraints and ran through the woods during the full moon until he was stopped by Derek Hale, who was believed be dead up to this point in time. ("Lunatic")
Allison went on a run through the preserve until she was drawn toward the Hale House, where Kate Argent confronted her about her desire to be strong and powerful. ("Wolf's Bane")
Allison and Lydia Martin went into the woods so Allison could test out a strange arrowhead she found in her family's basement. After shooting the arrow at a tree, she discovered it was a flash-bang arrowhead. She then sensed someone nearby and used her new taser to shock them, only to find that it was Scott, who had approached them to return Allison's Argent pendant, which he claimed to have found at school. ("Co-Captain")
Lydia Martin, still recovering from her attack at the hands of then-Alpha Peter Hale, went into a Banshee fugue state and escaped from the hospital. She was unconsciously drawn to Peter's body, which had been buried under the floor boards of the first floor of the Hale House, and wandered around naked in the woods for two days before she was found by Stiles and Noah Stilinski. ("Omega")
Allison, Scott and Stiles wandered through the woods as they searched for Lydia, until they found a trip wire. After Stiles accidentally pulled it, Scott's ankle was caught in a trap and he was hung upside down. Realizing that Hunters were nearby, Scott asked Allison and Stiles to go hide while he dealt with Chris Argent, who threatened to cut Scott in half if he didn't do as he was told and who warned him that should Lydia turn into a Werewolf as well, they would have a problem. ("Omega")