"It is looking really strong this year," Hawke's Bay Winegrowers chief executive James Medina said.
"It is the most wineries we have had involved."
More than 200 different wines, across a wide range of varieties, will be available for tasting.
Always on the look-out to create a point of difference for what has become the country's biggest regional wines event of its type, this year several winemakers are also looking at providing barrel samples.
"To give examples of aged red wines - to show the great ageability of Hawke's Bay reds," Mr Medina said.
Winegrowers events co-ordinator Elisha Milmine said the shows had grown year by year and she anticipated this year's events to be sell-outs.
"The benefits for the winemakers are very definitely there," she said.
The wineries involved will be putting together two lots of stock for both shows as they will be run on consecutive days, but some shifting of items will still need to take place overnight.
"It's a lot of hard work but we have some pretty efficient teams."
For the Bay's winemakers, the seasons of 2013 and 2014 were exceptional and Clearview's winemaker/owner Tim Turvey said the visitors to the Hot Reds events would experience that when a selection of the 2013 varieties was rolled out.
Each winery will present eight wines, with Mr Turvey including the "just bottled" 2013 Reserve Chardonnay as well as a 2013 Te Awanga Sauvignon Blanc in the whites selection.
Among the reds, he will roll out the 2012 Old Olive Block Cabernet Dominant and the red-blend Enigma Merlot Reserve.
Selecting the eight wasn't easy, Mr Turvey said.
"We do 28 different wines - there's not much we don't do."
Mr Turvey said that effectively echoed the Bay's overall fine reputation for winemaking across the board.
"We have strengths in so many varieties."
He said the Hot Red events were a valuable way in spreading the word through the national, and international, wine trade.
"It allows customers to evaluate new releases and current wines without having to come to the cellar door - we take the cellar door to them," he said.
The line-up of Bay wineries at next month's events are: Abbey Cellars, Alpha Domus, Ash Ridge, Babich Wines, Beach House, Black Barn, Church Road, Clearview Estate, Coopers Creek Hill, Crossroads, Cypress Wines, Elephant Hill, Esk Valley, Lime Rock, Mission Estate, Mills Reef, Ngatarawa Wines, Pask Winery, Rod Mcdonald, Sacred Hill, Sileni, Squawking Magpie, Te Awa, Te Mata, Tironui Estate, Trinity Hill, Unison, Vidal Estate, Villa Maria.