NH Climate for growing grapes

Lower temperatures actually help to maintain acidity in grapes. However, one thing to keep in mind is that the grapes might take a bit longer to ripen, resulting in more tart and acidic flavors. So, temperature is not the only factor to consider!
On the other hand, higher temperatures can have a negative impact on grape composition. They can affect the color, taste, and aroma of the grapes. It’s important to find that perfect balance when it comes to temperature for the best outcome. Grapes don’t like cold winds, they prefer full sun and to be in a protected enviornment.

During the dormant period, vines gradually develop the ability to withstand colder temperatures as they are exposed to low temperatures. This tolerance level varies depending on factors such as the grape variety, environmental conditions, and cultural practices. For instance, varieties like Chenin blanc, Merlot, Semillon, Syrah, Sauvignon blanc, and Zinfandel can handle temperatures between 5 to -5 degrees. On the other hand, Chardonnay, Cabernet-Sauvignon, Gewurztraminer, Pinot gris, Pinot noir, Sangiovese, and Viognier can tolerate temperatures ranging from 0 to -8 degrees. White Riesling, Cabernet franc, Gamay noir, and Chambourcin can withstand temperatures between -5 to -15 degrees. Additionally, there are some hybrid varieties that have the impressive ability to handle extremely cold temperatures, even as low as -20 to -30 degrees.

To create an ideal environment for cultivating grapes for wine making, you’ll want a generous, open area basking in sunshine, accompanied by nutrient-rich soil that drains well. For vertical growth on a trellis or arbor, each vine thrives in around 50 to 100 square feet. If going for a horizontal approach with rows, remember to maintain around 8 feet of space between them. Also, don’t forget that grapes crave the sun’s warmth, so ensure they receive a delightful seven to eight hours of direct sunlight every day!

The best suited grapes for New Hampshire are Minnesota hybrids. New Hampshire can also grow cold hardy grapes like Frontenac, St. Croix, LaCrescent. Concord grapes are found in most New England states as well. They have a lot of seeds, so they make for great for jellies and juices.

The ideal temperature range for growing grapes is between 77ºF and 90ºF. When the temperature dips below 77ºF, it can impede the growth of the fruit. Grapes thrive in moderate humidity levels, as extremely high or low humidity can be detrimental to their growth and fruit production, potentially leading issues like mold and mildew.