|“||That's a Devil's Gate; a damn door to Hell!||”|
A Devil's Gate is a doorway into Hell. There are a few known Devil's Gates that exist on Earth.
The first Devil's Gate we see is in Calvary Cemetery, southern Wyoming, in the form of a mausoleum entrance; which requires the Colt as a key to be opened and can be physically re-sealed by forcing its doors shut. A demon describes this particular Gate as being "built" by Samuel Colt some time before 1861. It is placed at the center of a 100-mile Devil's Trap, being built during this time. Kevin Tran told Crowley of a Devil's Gate but it is unknown whether it exists or not. A Devil's Gate in Jasper, Wyoming is mentioned in John Winchester's Journal, describing the legend of "a place where unimaginable evil emanates from creatures too wicked for the Pit to hold."
Azazel sent Jake Talley to the Devil's Gate, and Jake used the Colt as a key to unlock and open the Gate. Sam, Dean, Bobby and Ellen were able to shut the Devil's Gate again, but not before hundreds of demons and spirits (including John Winchester, Ruby, Lilith, Astaroth and the Seven Deadly Sins) escaped through the Gate from Hell.
Sam mentioned that during the four-month period when Dean was in Hell, he attempted to open the Devil's Gate to free Dean's soul from Hell, but was apparently unsuccessful.
In 2012, the prophet Kevin Tran tricked the current King of Hell Crowley into waiting near a supposed Devil's Gate that he was going to open, but it was a ruse and Kevin was actually performing a spell that would destroy demons.
In 2017, the last of the Princes of Hell, Asmodeus, tries to use the Nephilim Jack to open a Devil's Gate in Jasper, Wyoming. Asmodeus was attempting to release the shedim, who were sealed in an inaccessible section of Hell. However he was stopped by the Winchesters and the prophet Donatello Redfield.