Guide to Napa Valley
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NAPA VALLEY AVAs

Calistoga

The northernmost AVA in Napa Valley, where the valley bends and volcanic soil runs deep.

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Calistoga sits at the very top of Napa Valley, where Highway 29 runs out of valley floor and starts climbing toward Sonoma County. It's one of the newer AVAs on paper -- established in 2009 -- but it's also one of the oldest wine towns in Napa, and the ground underneath it tells a story that goes back to an actual volcano.

Most of Napa Valley runs roughly north-south, but at Calistoga the valley bends and briefly runs east-west, which changes how the surrounding mountains face the sun. The Mayacamas-side slopes here point just east of north, and the Vaca-side slopes point just west of south -- an orientation you won't find anywhere else in the AVA system. Underneath it all is a blanket of gravelly, stony and cobbly loam sitting on old volcanic bedrock, geologically more uniform across Calistoga than almost anywhere else in the valley.

That geology, combined with Calistoga's position at the closed north end of the valley, produces Napa's most extreme daily temperature swing. Summer afternoons here regularly push toward 100°F, the hottest daytime highs anywhere in Napa Valley -- but once the sun drops, the heat doesn't linger the way it does farther south. Nights can fall into the 50s, a swing of 50 degrees or more between the day's peak and the night's low. Vines get intense heat to ripen fruit and cold nights to preserve the acid that keeps a wine from tasting flat.

Cabernet Sauvignon is the backbone of Calistoga's reputation today, but the AVA has deep roots in Zinfandel and Petite Sirah, planted here well before Cabernet took over most of Napa's hillsides. Cabernet Franc, Merlot and Sauvignon Blanc round out what's in the ground, but it's the combination of heat and swing that defines the house style: ripe, dense fruit balanced by a streak of acidity that keeps the wines from feeling heavy.

Calistoga's boundary was quietly redrawn in 2024, when a small sliver at its edge -- Crystal Springs Vineyard -- was moved into the newly created Crystal Springs of Napa Valley AVA next door, cleaning up an overlap between the two. It's a minor footnote in a place better known for its hot springs, mud baths and the mineral water that made the town a resort destination a century before anyone was thinking about appellations. The wine came later, but the volcanic ground that makes Calistoga a spa town is the same ground that makes it a Cabernet town.

Facts sourced from TTB AVA establishment records; Wikipedia (https://en.wikipedia.org/wiki/Calistoga_AVA)

Wineries in Calistoga