Sweden's world number two Jesper Tjäder, who failed to land a clean run on either attempt in qualifying, missed the 12-man final.
Afterwards, the dreadlocked Harlaut, who was competing in his first Olympics, told Swedish Radio Sport that he was disappointed that his difficult choice of performing a "nosebutter triple cork 1620" had not earned more marks from the judges.
"It still feels good. I landed the best ride I've ever done and I think that the judges did not give as much as it was worth, but that's okay.
"There are two tricks I do that nobody else can do in the world. Then there are many who do not spin both ways on the rails and so that wasn't good. But anyway, I'm very happy to race the way I did. I just wish that I could have taken a medal."