Philly Wine: The Untapped Potential of the Philly Wine Region

Posted by Keith Wallace

Table of Contents

Specialists vs. Generalists

Back in the day, if you wanted to be a winemaker, there were two career trajectories. You could either become a generalist or a specialist. That meant either working for a big brand like Gallo or a boutique winery.

West Coast Wine

If you opted to become a specialist in California, you had a second choice to make: focus on Cabernet Sauvignon or Pinot Noir. This made sense in West Coast wine country, where the climate is a sunnier version of either Bordeaux or Burgundy.

East Coast Wine

Being a specialist doesn’t make sense for the East Coast, as our climate is not remotely similar to Bordeaux or Burgundy, even if we are on the same latitude. Nearly all winemakers on the East Coast are generalists: we don’t yet lock on the ideal grapes. What we do know is that neither Pinot Noir nor Cabernet Sauvignon is going to be the superstars of the East Coast.

Winemakers on the East Coast have to be generalists, even if they are making fine wine. There are grapes that already do very well on the East Coast and many more to discover.

Illustration of wine bottle with vineyard elements.

Looking to Europe, Not Napa

If you look at a wine map of either France or Italy, they look like half-eaten slices of Funfetti cake. There are hundreds of wine regions sprinkled throughout each country, and in each region, a small but distinctive set of delicious wine grapes.

After centuries of growing grapes, the winemakers of each region become specialists. After generations, they sorted out what grew best in their plots of land. Unlike here in the States, only a tiny percentage of these regions grow Cab or Pinot.

Will there be an East Coast superstar? There is no doubt that we will discover the best grapes to grow on our coast. I look forward to the time when we become as specialized as Europe, with each town and county having its own specialties. Fortunately, we have a good deal of science and data to show us the way.

Understanding Philly’s Wine Terroir

We can hone in on the European wine regions most similar to the East Coast with the right data. From there, we can extrapolate what grapes would thrive in our soils. To get this right, we need four data sets: a wine region with a similar climate, humidity, sunshine, and soil acidity.

In this article, I am focusing on the wine regions around Philly since that is where the Wine School is located. This work can be done for any wine region on the East Coast. Links are included at the bottom of this article if you want to do your own deep dive into local wine.

Köppen Climate Classification

The world relies on agriculture, and a lot of research has mapped the world’s climates. The result is the very detailed Köppen database, which integrates climate research with satellite mapping. We are at a classification crossroads in Philly. South of Philadelphia, the East Coast is classified as a “Humid Subtropical Climate.” North and west of Philly, up to Boston, is labeled mostly “Humid Continental Hot Summers With Year Around Precipitation.”

There are only a few European wine regions that fit the bill. Of the three major European wine countries (France, Spain, and Italy), only Northern Italy is categorized as a Philly-esque “Humid Subtropical Climate.” Plus, Philly’s regions north and west fall into the same classification as wine regions in Germany and Austria.

Weather Patterns

Along with Köppen, we can hone in on the goldilocks zone by tracking the average monthly temperature. The DNA of every type of wine grape has evolved to ripen under specific weather patterns. Some grapes like a cool summer and warm fall. Others love a hot summer and a cold spring.

Since what we want are ripe, delicious fruit, we need a climate match of 98% or better. From NYC to Washington DC, the East Coast is a near-perfect match for Northern Italy, with less than a 2% variation. The only major difference is the diurnal temperature shifts: many grapes do better with cooler nights. Higher elevation plantings or near the coast could address this issue.


The East Coast is a rainy mess, and we all know it. We need to find grapes that can handle up to four inches of rain, on average, during both September and October. That narrows the playing field, as well. Most wine regions rain less than an inch during harvest. As a rule, rain during harvest often means bruised, moldy, and bloated grapes. Once again, Northern Italy fits the bill. This is looking good!

Relative Humidity

Humidity is the worst. Everyone hates it except for molds and bacteria: they freaking love it. It doesn’t take a Master Sommelier to know that mold on fruit is a terrible thing. We need grapes adapted to a region with a similar level of humidity. Otherwise, the vineyards are going to be ripped out faster than you can say, “WTF is Odium?”

In Philly and much of the East Coast, the humidity levels are nasty during the summers. Average levels range between 66 and 75% in August. If you’re from here, you know Philly gets thick and greasy in the summertime. With humidity and rainfall, we can narrow down our search to the Northwest region of Italy, specifically Piedmont. It sports an average humidity of 75%.

Average Sunshine

Heat may be important for ripeness but not nearly as important as sunshine. It’s all about photosynthesis. If you ever try and grow grapes –or any fruit– you’ll soon realize that it doesn’t matter how hot it is. If the fruit doesn’t get at least 8 hours of direct sunlight, your future ain’t going to be sweet. As a rule, we need at least 2500 hours of sunshine during the growing season to match Piedmont, and we do.

Soil pH & Drainage

Sommeliers love to talk about dirt in relation to the concept of terroir. Here’s the dictionary definition:

The complete natural environment in which a particular wine is produced, including factors such as the soil, topography, and climate.

The characteristic taste and flavor imparted to a wine by the environment in which it is produced.

Philly Terroir?

If you’ve taken a class at the wine school, you know we find most claims of terroir highly suspect. As I have told many a class of fledgling sommeliers: “terroir is often bullshit!”.

Soils aren’t magic. They have two jobs: control drainage and help in nutrient intake. Like many plants, grapevines need soils that drain well, as their roots don’t perform well in damp (mesic) topsoils. This means having subsoils that allow water to pass through into the rock fragment layer above the bedrock. Vines perform well in soils with limited nutrients, but they need to absorb calcium, phosphorus, and magnesium. The more acidic the soil, the less of these nutrients are available to the grapevine.

Textbook Wine Regions

Viticulture textbooks give the optimal pH for grapevines between 5.5 and 6.5 pH. Large segments of the Northwest coast are within that range. On the East Coast, it’s a different situation. Below Philadelphia, much of the soils are too alkaline. Soils become more acidic north of Philly but really only get into the 5.5 pH range up in Portland, Maine. There is a band of well-balanced soils from Roanoke, Virginia, to Allentown, Pennsylvania.

Alkaline Soil

So, what happens when soil is too alkaline? The grapevines take up too many nutrients, which they can’t process fast enough. As with so many things in life: too much of a good thing will kill you. But here’s the rub, kiddos: the opposite is true for most of Europe’s wine region. Their soils are often too acidic for grapevines to thrive.

Of all the elements that affect vine health and growth, soil chemistry is one of the most important but also the easiest to alter. It’s something farmers have been doing for centuries. Amending soils with lime is an environmentally sound and inexpensive way to increase the pH of our vineyards.

The Best Grapes for Philly Wine

In the end, the data show there are actually four wine regions in goldilock zones, each very similar to the East Coast’s overall climate. They are located in Iran, Austria, Georgia (the country), and Northwest Italy.

Persian Grapes

While the thought of Iranian wine sounds crazy, it really isn’t: the Persians were some of the first vignerons in the world. There is evidence of wine being made 7,000 years ago. Sadly, this is a dead-end: we don’t know what varietals the Persians grew. And even if we did, they are probably extinct.

Georgian Grapes

Georgia proves to be a better candidate. An ancient wine region as well, they continue to grow their native varietals, and some of them are excellent. This includes the white grapes Kisi, Khikhvi, and Krakhuna. For reds, Saperavi and Shavkapito are the stand-outs.

Austrian Grapes

Austrian grapes that are candidates include the white grapes Grüner Veltliner and Riesling. For reds, Zweigelt and Blaufränkisch are the most exciting.

Piedmontese Grapes

It is very exciting that our climate is so closely aligned with Piedmont. This is the home of some of the greatest wines in the world. The grapes that may have great potential on the East Coast are all reds: Nebbiolo (of Barolo fame), Barbera, Bonarda di Chieri, and Freisa. Grapes from other parts of Northern Italy may work as well, including Corvina (of Amarone fame)

Philly Wines To Try

While much of this article is theoretical (for now), there are a few of these varietals being made right now. And they are delicious!

  • Fero Vineyards & Winery Saperavi (PA)
  • Mazza Vineyards Teroldego (PA)
  • Presque Isle Wine Cellars Grüner Veltliner (PA)
  • Galen Glen Winery Riesling (PA)
  • Barboursville Nebbiolo (VA)
  • Va La Vineyards “Cedar” Nebbiolo (PA)
  • Channing Daughter Blaufrankisch (NY)


Köppen Climate Classification.  Here’s the data on the United States and Europe.

Weather Patterns. A great resource for identifying regions with similar climates.

Mean Relative Humidity. For month to month maps of humidity in the USA, check out  For a quick breakdown of humidity, this article on Forbes is a great place to start. For humidity data in Europe:

Soil Chemistry. For detailed analysis, check out SoilGrids. It’s catnip for soil geeks.

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