Cupitt's Winery has decided not to harvest any of its vineyards for wine production this year after the continued presence of smoke in the Milton-Ulladulla region, and greater NSW, has affected its grapes.

"Based on our testing, we have decided not to harvest any of our vineyards for wine production," Cupitt's Estate customer experience manager Libby Cupitt said.

"Furthermore, the results that many of our growers have received have demonstrated it is too risky to proceed with any NSW fruit in areas where grapes have been affected by smoke taint."

Cupitt's Estate and the grape growers it works with in Hilltops, Orange, Tumbarumba and Canberra, have had their grapes tested by the Australian Wine Research Institute (AWRI) and await the results.

If tainted grapes are made into wine it will cause unpredictable levels of undesirable characters which will generally get worse over time.

Cupitt's generally uses about 120 tonnes to create its yearly vintage, but expects to use about 30 tonnes this year. It has been able to source fruit from Victoria and South Australia to ensure it still has a 2020 vintage.

"This will have some impact on some of the wine varieties available in 2021, however, we want to assure all our friends and supporters that we will not run out of wine."

Established for more than 13 years now, Mrs Cupitt said the agricultural business was prepared for any possibilities weather and nature throws at it.

"In anticipation of a situation just like this, we have a reserve supply of wine which has been stored in our museum cellar," she said.

"We recently did a new bottling run of the 2019 red varieties and chardonnay which will be released over the next 18 months."

Unprecedented bushfires and natural disasters like the flooding which occurred at Silos Estates, north of Nowra, has made it a "very tough year for the Australian wine industry and farming in general".

Mrs Cupitt urged the public to back their local producers and the wine industry.

"Our hearts go out to all the growers in wine regions around the country who have suffered, particularly the growers and wineries directly impacted by bushfires in Tumbarumba and Adelaide Hills."