Peter Michael's estate vineyards (founded in 1982) are what make his wines truly exceptional. Sugarloaf Ranch sits high above Knights Valley in eastern Sonoma County, and from its rocky volcanic soil come Sauvignon Blanc, Chardonnay, Cabernet Sauvignon, Merlot and Cabernet Franc. The Alexander Mountain Estate Vineyard, above Alexander Valley, provides additional Chardonnay. All Peter Michael wines are site-driven single vineyard bottlings, whether from the estate or the limited sourced appellations. The line-up of estate wines is supplemented by a Pinot Noir from Pisoni Vineyard called "Le Moulin Rouge."