Dean: Did you read anything else off the tablet before you stashed it?
Kevin: I read stuff about how to close the Gates of Hell. Forever.Kevin: Banish all demons off the face off the Earth. Lock them away forever. That could be important, right?
Dean: Come again?
A Hell Gate, also known as a Devil's Gate, is a portal between Hell and Earth, which when opened allows demons passage to Earth. There is a tablet which contains instructions on how to close all Hell Gates.
- Devil's Gate Reservoir: Bill Harvelle and John Winchester were hunting a Hellspawn at the Hell Gate in Reservoir when Bill was killed.
- Devil's Gate in Wyoming: There is a Hell Gate at Fossil Butte Cemetery where Samuel Colt had built a huge devil's trap around it. The trap is 100 square miles across in southeastern Wyoming. There is a church at each point and the sides of the pentacle are made of iron railroad lines. Azazel plans to open the Gate and use beings from Hell as soldiers in a war against humanity. As the devil's trap prevents from getting to the Gate, he used Jake Talley - one of the Special Children to cross into it and unlock the Gate. He does this using the Colt as the key. When the door is open the blast of energy lights up the surrounding railways and blows up at least one of the churches, which significantly weakens the devil's trap and allows the Yellow-Eyed Demon to enter. Hundreds of beings, including demons and spirits, escape from Hell before Bobby and Ellen manage to close the gate. John Winchester is among those to escape through the gate.
- Hell Gate in Purgatory: It is revealed in 8.19 Taxi Driver that there is "rabbit hole" to Hell located in Purgatory. Rogue reapers such as Ajay use it sneak mortals and souls in and out of Hell. Sam uses it to rescue Bobby Singer's soul from Hell as part of the second trial.