The central conflict of The Virginian is the struggle that is his life. At times the struggle is his growing relationship with Molly Stark Wood. Other times it is a struggle against government corruption and minimal governing actions. And still other times his struggle is against Trampas. If I had to pick one, I would pick the Trampas conflict, because I believe it is associated with what I would choose as the climax of the story.
After many years of hate and antagonism toward each other, the Virginian and Trampas have a shootout with each other. The Virginian wins. From here, I feel the rest of the story is closing actions and resolution. He marries Molly, they honeymoon in the mountains, and go back to Vermont to meet her family. After that they go back to Wyoming where the Virginian becomes a partner of a ranch.