Breakfast around the clock may be helping boost McDonald's US sales figures but the New Zealand branch is keeping quiet on whether the all-day breakfast currently being trialled will stay.

The fast food chain has been running all day breakfast at six of its locations around the country since June last year: Albany, Massey Road and Penrose in Auckland, Bank St and Kamo in Whangarei, and Frankton in Hamilton.

McDonald's spokesperson Simon Kenny said initial feedback had been extremely positive.

"All day breakfast has been going well across the six participating restaurants in New Zealand over the last three months," Kenny said. "Customer feedback has been very positive and the trial is ongoing," he said.

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"Other recent trials like McCafe at Drive-Thru and Create Your Taste proved popular with customers and were then rolled out nationally, and we're hopeful all day breakfast will be similarly received."

The company could not confirm when it would be making a decision on whether to keep the all-day breakfast, although it had previously launched this in New Zealand several years ago but with limited success.

Kenny said there were other considerations as well, saying that McDonald's had committed to using 100 per cent free range eggs by the end of 2016, something he said would need to be looked at if it was to extend its all-day breakfast.

The company has also been trialling gourmet breakfast options in its renovated Greenlane restaurant, including cafe-style breakfast like Belgian waffles and avocado smash.

The latest Create Your Taste service had also been well received, offering customers the chance to create their own gourmet burger from more than 32 ingredients using a digital kiosk, which is then made fresh in the open kitchen and delivered to the customer via table service.

All-day breakfast rolled out across Australia early in December and its US branch said the launch of this in the States combined with unseasonably warm weather had helped lift sales by 5.7 per cent in the last three months of the year.

Kenny said McDonald's New Zealand had been closely monitoring the trial.