Judging for the annual show began on Monday and four judges will spend the next two days sampling the rest of the 451 wines from 76 Tasmanian exhibitors.

There are 27 classes in the show, that include wines from 2010, 2011, 2012, 2013 and even older vintages.

Judge Huon Hooke, of Sydney, said Monday and yesterday were spent tasting and judging riesling, pinot noir and sauvignon blanc.

He said the 2013 rieslings were impressive.

``Sixty per cent of the wines in the class got a medal, four got golds and a large number were awarded silvers,'' he said.

``The 2013s are typified by the lovely fragrance aromatics, they have beautiful aromas and they're not as sweet as many other years.

``They're dry, they were deeply concentrated in colour and flavour and very powerful.''

He said the 2012 pinot noirs were outstanding, but the 2013 sauvignon blancs, that were tasted on Monday, weren't as good as they should have been.

``It doesn't look as if people are trying very hard with sav blanc,'' Mr Hooke said.

``When we've tasted those wines, there were a lot of thin, scrawny, green hollow wines that had too much acid and not enough fruit.

``I don't think it's because of the vintage, because 2013 was a very good year, but I wonder if they are over cropping . . . . or they're just not paying the attention they should.''

Judging of the show will continue at Drysdale TASTafe in Paterson Street until tomorrow, however, it may be pushed back due to hot weather.

Awards will be announced at a trophy dinner at Velo Wines at Legana on Friday night.