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clearing sunny spells, more fog in the afternoon and clearer evenings to flow eastward through the region. A typical day in the valley can experience a temperature change of 40 to 50 Ā°F (22ā28 Ā°C). These cycles contribute to a longer growing season benefiting cool-climate grape varieties. The lower elevations and rolling hills in
Petaluma Gap allows the marine air to enter at a higher velocity than the surrounding regions where higher and steeper slopes disrupt the air flow. Although marine breezes are present during most of the day, the wind increases significantly in the afternoon hours because the rising inland hot air pulls the cooler, heavier marine layer from the coast causing a steady airflow. The effect of these prolonged high winds on the grapes is a reduction in photosynthesis to the extent that the grapes have to remain on the vine longer (hang time) in order to reach a given sugar level, compared to the same grape varietal grown in a less windy locations. Grapes grown in windy regions are typically smaller and have thicker skins than the same varietal grown elsewhere. According to the AVA's petition, the smaller grape size, thicker skins, and longer hang time concentrate the flavor compounds in the fruit, allowing grapes that are harvested at lower sugar levels to still have the typical flavor characteristics of the grape varietal. Also with the wind, there is no
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28,077 acres (11,362 ha) to include all of the
Petaluma Gap and a partial overlap with the Sonoma Coast AVA. The Marin County portion of the Petaluma Gap remained outside of the Sonoma Coast AVA, while the Sonoma County portion remained within the Sonoma Coast AVA. TTB allowed the partial overlap to remain, primarily because the name āSonoma Coastā is associated only with the coastal region of Sonoma County and does not extend into Marin County.
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issues and the grapes have a higher skin-to-juice ratio. The TTB modified the boundary of the North Coast AVA as described in Notice No. 163 because it determined the expansion area had the similar marine-influenced climate of the North Coast AVA. Therefore, the North Coast was expanded approximately
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TTB received the petition from
Patrick L. Shabram, on behalf of the Petaluma Gap Winegrowers Alliance (PGWA), proposing the establishment of the āPetaluma Gapā AVA and the boundary modifications to the multi-county North Coast AVA. Around 75 percent of plantings are Pinot Noir, with Chardonnay at 13
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are topography and climate. Its topography sets the AVA uniquely from Sonoma Coast AVA. The āGapā literally describes the geological valley that is a 15 miles (24 km) wide by 30 miles (48 km) corridor between the coastal hills allowing the salty maritime winds and a cycle of morning fog,
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with eighty commercially-producing vineyards cultivating 4,000 acres (1,619 ha) and nine bonded wineries. The wind gap in its coastal mountain range funnels cooling breezes and fog east from the
Pacific Ocean through the city of Petaluma to San Pablo Bay. A persistent afternoon breeze causes
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lower grape yields and longer hang time contributes to the AVA vintages' unique flavors and fruit characteristics which defines their character and distinction.
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This article incorporates text from this source, which is in the
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422:Boone, Virginia (September 26, 2019).
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208:established on January 8, 2018 by the
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498:Geography of Marin County, California
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389:. Petaluma Gap Winegrowers Alliance.
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508:2018 establishments in California
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206:American Viticultural Area (AVA)
338:: 57659ā57664. January 7, 2017.
280:percent, and Syrah 12 percent.
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445:Petaluma Gap - Wind to Wine
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49:American Viticultural Area
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152:Size of planted vineyards
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428:Wine Enthusiast Magazine
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365:"Petaluma Gap Wine"
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163:of vineyards
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192:of wineries
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222:Highway 37
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179:Pinot Noir
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144:Total area
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