Brendan Reeves was trekking through remote Nepal with two Japanese companions when Saturday's 7.8-magnitude quake hit, his mother, Glenys Reeves, told the Otago Daily Times.
Mr Reeves was listed as missing by the Red Cross following the quake and Mrs Reeves spent an anxious 24 hours awaiting news.
''Hi, we are all good,'' his Facebook message to his mother started on Sunday night.
''He didn't say a whole lot because he didn't want to flatten his battery on his cellphone,'' Mrs Reeves said.
''There was a shortage of power and they couldn't charge their phones.''
Mr Reeves confirmed he was uninjured and in good health, despite being shaken.
Before that, Mrs Reeves and husband Geoff knew only Mr Reeves was somewhere in the wilderness of Nepal, days into a trek to Gokyo Lakes in the Himalayas.
She admitted being ''a bit worried'' after initial reports of the earthquake.
''You always like to think it's going to be the best [possible news], but you always worry about it a bit,'' she said.
The earthquake hit just after 6pm on Saturday (New Zealand time) and had so far claimed more than 4300 lives.
Mr Reeves and his companions were trekking between Namche Bazaar and Mongo when the quake struck.
''They decided with the landslides and all that around them, they better head back because it was quite large and scary,'' she said.
Mr Reeves and his companions walked back through the valley to Namche Bazaar, dodging landslips as they went.
''There was lots of landslides,'' she said.
''One came down right in front of him.''
The trio then returned to Lukla, where they were camping at present.
''They aren't sleeping in any buildings at the moment because of fear of aftershocks.''
She and her husband knew few details of the quake as families of those listed as missing had received little information from government sources.
She contacted the Ministry of Foreign Affairs on Sunday night to let them know Mr Reeves was unharmed.
The experienced snow sports instructor spent summer in Japan and ''usually comes home now'', but extended his time overseas to trek in Nepal. It was his first visit to that country.
Mrs Reeves said her son would leave Nepal as soon as a flight was available.
Access to Lukla was by plane only and the airport was ''pretty jammed up'' after the quakes.
His companions were also unharmed.
He was expected to return to New Zealand in late May. An emotional hug and greeting awaited him, Mrs Reeves said.
• According to the Red Cross, nine New Zealand-born travellers were yet to make contact with family members.
