Prime Minister Jacinda Ardern has urged Australians to book holidays across the ditch saying they can look forward to the "warmest possible welcome you can imagine". 

Ardern's promo interview on the Australian breakfast show Sunrise this morning comes just days after the Government announced borders would reopen to tourists from April 12 amid a rapid campaign to get New Zealand back on the international tourism agenda. 

"I cannot remember a time when we have been so excited about the prospect of seeing as many Australians as possible come and visit us," Ardern told Sunrise, speaking from tourist hotspot Queenstown. 

"You can expect to get the warmest possible welcome you can imagine." 

The border was originally scheduled to reopen to tourists at the latest by July, but the Government brought forward the schedule as the country moves through the Omicron peak. 

Those crossing the Tasman can arrive from 11.59pm April 12, while people from other visa waiver countries - including the United States and United Kingdom - can enter from May 2. 

Self-isolation rules have also been dropped recently reflecting the shift in risk profile from international arrivals, who now only have to return a negative pre-departure test and do rapid antigen tests on days 1 and 5 once in New Zealand. 

Ardern said the outbreak was now "stabilising" allowing them to set the April 12 date to give the industry some warning. 

Ardern said the border announcement had been met here with "a sense of relief, anticipation, excitement and joy". 

Tourism was "hugely important" to the economy, Ardern said. 

The once nearly-$42 billion industry had been decimated after the borders were shut due to the pandemic, with thousands of jobs lost. 

While Queenstown was popular domestically Australia was a "very important market", Ardern said. 

About 40 per cent of tourists across the country came from Australia, she said. 

But, as with Australia, tourism was about more than just money, she said. 

"For us, it is about a step towards more normality. So much of who we are as a nation is defined by our tourism because we pride ourselves on welcoming people, showing off our country with amazing hospitality. 

"To not have been able to do that has been a real blow for us for two years... We are elated." 

Asked about any scenarios where border movements could be tightened again and managed isolation and quarantine introduced, Ardern said it would be similar worldwide. 

"Covid is here. It is vastly different than those periods before when we were trying to operate that [transtasman] bubble while trying to keep Covid out. 

"We are in vastly different places. We are both highly vaccinated, both have Covid here and are managing as the rest of the world is. 

"The only thing I think anyone could say could cause disruption at the border in the future would be another variant, highly dangerous, where vaccines don't work. 

"To be frank, that would cause the whole world to think differently." 

Ardern said tourists could now "plan with certainty" to travel to New Zealand. 

The border reopening for tourists has been welcomed by tourism operators and the wider industry. 

It has also been accompanied by a $49m tourism kick-start fund to help businesses in hardest-hit regions, including Fiordland, Queenstown, Wanaka, Kaikōura, Westland and the Mackenzie District. 

Ardern is today in Queenstown with Tourism Minister Stuart Nash. They will be speaking to media at about 2pm.