Tim lives in Wanaka and wanted to do the fundraiser as a personal thank you to the emergency services which saved his life earlier this year at a Snow Sports NZ pre-season training camp.
Tim's near-fatal encounter with alcohol at the camp sparked a police investigation, and several youths are still being investigated by Wanaka's police youth aid officer for alleged theft and an assault on Tim.
He is not being investigated by police for his part in the incident.
Tim will give $1000 to Wanaka's St John Ambulance appeal fund, $1000 to the Otago Rescue Helicopter Trust and $400 to Dunedin Hospital's intensive care unit.
His mother Jill hopes further contributions can be made once all promised donations have been collected.
Tim, his mother and their friends manned the sausage sizzle at Wanaka New World Supermarket on Saturday and the others continued without him on Sunday, because of Tim's commitments in the games.
Mrs Herbert said Tim wanted to raise as much money as he could, so he went down to the Wanaka skatepark and visited several businesses to talk people into buying a sausage.
"If they did not have the $3, he suggested they donated what they had," Mrs Herbert said.
Tim got up at 5.15am the next day to go to the snowboard slopestyle event at The Remarkables, in Queenstown, which attracted 26 men and eight women.
He was one of six New Zealanders who progressed to the men's final, in which Stef Zeestraten and Nick Hyne (both New Zealand) won gold and silver.
Mrs Herbert said she was proud of Tim's efforts during the weekend.
"It [the slopestyle] was the only Winter Games competition he could enter, as he is only 14.
"And to make it through to the finals with all the pros was absolutely amazing," Mrs Herbert said.
