In Icy Michigan, Fennville AVA Is a Grape-Growing Goldilocks
The influence of bodies of water on viticultural regions can be dramatic, often serving as the key environmental factor behind the unique terroir and wine styles of various regions. Lakes, in particular, play a foundational role in tempering climates, such as the regions of Finger Lakes AVA, Austria’s Neusiedlersee and the shores of Lake Michigan, which cradles Fennville AVA, the United States’ fourth-oldest AVA.
Nestled within the southwest corridor of Michigan, Fennville AVA enjoys an advantageous position along the sandy shores of Lake Michigan’s widest point. Though the state is known for its brisk winters and ample snowfalls, Fennville’s specific location means it benefits from what’s referred to as the “lake effect,” which plays a pivotal role in moderating local climate, often by up to 10 degrees Fahrenheit. This natural phenomenon, courtesy of Lake Michigan’s vast and cold post-winter waters, delays bud-break typically until May, thus protecting the vines from frost. Conversely, as fall unfurls, the lake’s waters, now warmed from the summer heat, prolong the warmth, extending the growing season to September through November and affording the grapes more time to achieve full ripeness.
The region is also perched at a higher elevation compared to its surroundings. “The sandy loam soils combined with the elevation allow for water to easily drain away and for a lot of the cold air to roll away from the vines,” explains Brian Lesperance, winemaker at Fenn Valley Vineyards, the region’s pioneering winery, which petitioned for the formation of the AVA in the early ’80s. “The sandy loam also helps reduce vigor and increase aromatics, helping us with varieties like Sauvignon Blanc and Merlot.”
While the region initially grew a lot of hybrid varieties, much of this has been replaced with Vitis vinifera. “We can emulate many of the cooler regions from around the world, including the Loire, Alsace and Austria,” says Andrew Backlin at Modales Wines. Grapes that flourish in cooler temperatures thrive in Fennville AVA, including Riesling, Chardonnay, Pinot Gris, Pinot Blanc, Pinot Noir, Sauvignon Blanc, Gamay and Cabernet Franc. But the longer ripening period means that even heat-loving late ripeners such as Cabernet Sauvignon can be successfully grown.
The region also experiments with lesser known vinifera. “The market really enjoys the Zweigelt that we have grown,” comments Lesperance. At Modales winery, Backlin is producing wines inspired by Alto Adige, such as Teroldego and Lagrein. “It’s a cooler region, so we push to make more aromatic styles,” says Backlin. “I like to think of the wines as acid forward with some meat on the bones.”
The region is not without challenges. Rainfall is sporadic, leading to high humidity levels that increase the risk of fungal disease. “We don’t get heat without humidity,” says Lesperance, who adds that specific grape growing strategies help combat pest and disease pressure, including using clones with looser clusters and planting at higher elevations where wind can assist in reducing moisture.
At just over 40 years old, Fennville AVA has seen an evolution in grape varieties planted and wine styles produced, but one thing that’s been consistent is the ability to craft wines with a true sense of place. Comments Backlin, “While a lot of AVAs end up with political boundaries, Fennville AVA really speaks to the terroir.”
Quick Facts
- Date AVA Established: 1981
- Total Size: 75,000 acres
- Planted Acreage: Under 500
- Most Planted Grapes: Riesling, Merlot, Chardonnay
- Climate: Cool to Moderate Maritime
- Number of Wineries: 6
This article originally appeared in the December 2024 issue of Wine Enthusiast magazine. Click here to subscribe today!
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