It began about 8.30am and by late morning about half the crop had been picked.
Mr Mooney said Mission had a strong belief in the potential for the low-alcohol market, and that had been backed up by the response the 2014 "trial run" of pinot gris had got through the cellar door over the summer.
"People were tasting it and then buying it and I think we've come up with a good style."
The wine checks in at just 9.5 per cent alcohol and was carving a place in the lifestyle market, Mr Mooney said.
"We believe there will be consumer growth for this."
Shortly before yesterday's pick he and Mr Wheeler did a final in-the-vines tasting of the grapes and declared them ready for the early harvest.
"There is good flavour in there."
They were grown in a specially prepared organic block.
Mission is part of the Organic Focus Group.
The fermentation process will take place over the next couple of weeks with bottling set down for about a month away.
Yesterday's harvest appeared to be the first for the Bay in 2015.
"I haven't heard of any others starting just yet."