Trinity Anglican College initially delayed Tuesday's planned start of the four-day camp before announcing that afternoon the trip would not go ahead at this time.

Principal Justin Beckett said the NSW Rural Fire Service had given the park region a severe fire rating, with zones deemed as catastrophic "not ridiculously far away".

"Our other concerns about Kosciuszko National Park is your lack of exits by road in the event there was a problem," he said.

"It was a decision made in the interests of student safety and care."

Bushfires are ravaging parts of NSW, with emergency services warning of little respite in the weather conditions over coming days.

IN OTHER NEWS:

Involving the whole year 9 cohort of 110 students, the Trinity camp had included a hike to the summit of Mount Kosciuszko as part of a program that explored teenagers becoming more responsible, thinking like adults and testing their boundaries.

"And so climbing the biggest mountain in Australia has a great symbolism about it, so we were quite excited about the prospect of doing that," Mr Beckett said.

"This was going to be the first year; because it's the first time, we have to be even more cautious.

"Parents are really understanding because they obviously want the school to take a safe position on these sorts of things."

The principal said an alternative program could have been organised locally this week, but the school preferred to postpone instead.

"We don't want to compromise the experience for the kids," he said.

"We'd much rather defer the experience and do it properly when all the conditions are right."