The Old Mission Riesling and the Glacial Slope: A Pour at Mari Vineyards

Driving north from the bustling downtown of Traverse City, the urban grid quickly dissolves into the narrow, spine-like landscape of the Old Mission Peninsula. This finger of land, barely three miles wide at its broadest point, stretches eighteen miles into the deep turquoise waters of Lake Michigan’s Grand Traverse Bay. The geography here is a relic of the last glacial period, a ridge of sandy loam and gravelly soil that provides the drainage necessary for some of the most sophisticated viticulture in the American Midwest.

At the heart of this ridge sits Mari Vineyards. While the region is famous for its tart cherries, the microclimate created by the surrounding waters—which act as a thermal heat sink—has allowed winemakers to push the boundaries of what is possible in a northern climate. Mari is a testament to this experimentation, blending traditional European techniques with the rugged realities of the 45th parallel.

Local Story

The story of wine on the Old Mission Peninsula is one of defiance against the thermometer. For decades, it was assumed that only the hardiest of hybrid grapes could survive the biting winters and late spring frosts of Northern Michigan. However, the deep waters of the East and West Arms of Grand Traverse Bay don’t freeze easily, creating a buffer that keeps the peninsula slightly warmer than the mainland during the critical shoulder seasons.

Mari Vineyards was born from a desire to see if Italian varieties—grapes like Nebbiolo and Sangiovese—could thrive this far north. To achieve this, the vineyard employs a unique 'Oasis' system, using large hoop houses to cover the vines in the early spring and late fall, effectively extending the growing season. This commitment to variety and innovation has helped shift the perception of Michigan wine from simple, sweet whites to complex, age-worthy reds and bone-dry Rieslings. The stone architecture of the tasting room, built with materials sourced locally, feels anchored to the earth, echoing the subterranean caves where the wine is aged in French oak barrels.

Experience Guide

Visiting Mari Vineyards is as much about the landscape as it is about the liquid in the glass. The tasting room offers panoramic views of the East Arm of the bay, providing a visual context for the 'lake effect' that defines the wine. When you arrive, start with a flight that highlights their estate-grown Riesling. The 45 North latitude here is the same as that of the Piedmont region in Italy and the Rhône Valley in France, and that shared geography shows in the wine’s high acidity and mineral backbone.

For a deeper experience, look for their 'Nellaserra' series, which features the grapes grown under the Oasis covers. These reds are a rare find in the Midwest, offering tannins and structures typically associated with warmer climates. You can explore the cellar via the Zuro app to see how these bottles pair with the wider culinary scene in Traverse City. After your tasting, take a slow drive further north on M-37 to the Mission Point Lighthouse to see where the peninsula finally dips into the lake.

The Terroir of the 45th Parallel

The soil at Mari is a complex tapestry of glacial till. As the glaciers receded thousands of years ago, they left behind a mix of sand, clay, and erratic boulders. This varied drainage means that even within a single vineyard block, the grapes can develop different flavor profiles. The proximity to the water also ensures high humidity and consistent breezes, which are vital for preventing mold and rot in the tightly clustered grapes. This constant movement of air is the secret weapon of the Old Mission AVA (American Viticultural Area), keeping the fruit clean and the acidity bright.

Subterranean Secrets

One of the most impressive features of the estate is the wine cave system. Tucked beneath the tasting room, these caves maintain a naturally consistent temperature and humidity, ideal for the slow maturation of red wines. The use of gravity-flow winemaking—where the juice is moved by natural force rather than mechanical pumps—helps preserve the delicate aromatics of the fruit. Tours often lead guests through these cool, quiet corridors, where the scent of aging oak and damp stone provides a sensory bridge between the vineyard rows above and the bottle in your hand.