Garcia Knight, who began the event as the number one qualifier, crashed out of medal contention after failing to land a trick in his first two of the three rounds in the final.
The 20-year-old was hoping to add to New Zealand's historic medal tally at the PyeongChang games after teenagers Zoi Sadowski-Synnott and Nico Porteous both claimed bronze medals on Thursday.
But the Kiwi snowboarder wasn't able to land the switch backside 1620, the trick which earned him the highest score in the qualifiers.
Canadian Sebastien Toutant claimed the gold medal after racking up a combined score 174.25.
Toutant edged out American Kyle Mack and Britain's Billy Morgan who earned the silver and bronze medals respectively.
Garcia Knight ended up in 11th place.
The Kiwi snowboarding star also came agonisingly close to a medal in the men's snowboard slopestyle where he finished fifth.
