Liz Thach serves as a wine judge at a variety of national and international wine competitions, including:
- American Fine Wine Competition
- Best of Wine Country Awards for San Francisco Magazine
- California State Fair Wine Competition
- Central Coast Wine Competition
- Concours Mondial de Bruxelles – Mexico Selection Wine Judging
- Dallas Morning News & TexSom Wine Competition
- Decanter Magazine World Wine Awards
- East Meets West Wine Competition
- Experience Rosé Competition
- Grand Harvest Awards
- Idaho Wine Competition
- International Women’s Wine Competition
- Los Angeles International Wine Competition
- McMinnville Wine & Food Classic Wine Competition
- Napa Valley Vintage Perspective Jury Tasting
- Ningxia China Top Regional Wine Competition
- Oregon Wine Experience – Wine Competition
- Press Democrat North Coast Wine Challenge
- San Francisco International Wine Competition
- Silk Route Forum and Tasting Ningxia China
- Sonoma County Harvest Awards Competition
- Sonoma International Film Festival Wine Awards
- Sonoma County Barrel Judging
- Southern Oregon Wine Competition
- Star/Napa Valley Vintners Tasting Panel
- Sunset International Wine Competition
- Sydney International Wine Competition
- TexSom International Wine Awards
- US National Wine Competition
- West Coast Wine Competition
- Wine 100 Shanghai China Competition
- Wine Pinnacle Awards by Genting Singapore
- Wines & Vines Packaging Design Awards