Young hikers the latest rescue in Tasmania

Four young bushwalkers who spent the night lost in Tasmanian wilderness have become the latest hikers to be rescued in cold weather.

The two men and two women, all aged in their early 20s, were on Monday morning found safe and well by search crews in Mt Field National Park.

The group became disorientated at the top of Tarn Shelf in the state's south on Sunday when they walked off the designated track.

They raised the alarm by phone, but bad weather hampered evening attempts to reach them.

The temperature in the region dropped to minus 4C overnight.

"I understand they're in reasonable condition, considering they spent the night out," Inspector Philippa Burk told reporters.

Police say the group hadn't registered their walk with parks authorities.

"We would urge you, if you're going for a day walk, please register. Let your near and dear know if you're doing a walk," Insp Burk said.

It is the fourth time in five days search crews have rescued bushwalkers in strife.

Two hikers were plucked to safety from the Lake St Clair-Cradle Mountain National Park on Saturday after they got trapped due to poor weather.

A Victorian hiker, 59, was rescued near Lake Mackenzie on Friday, while two adults and a baby spent a freezing night huddled in a tent on the Overland Track last week before they were reached by a ground crew on Thursday morning.