Which grapes suit Arizona's high desert, and why

In late 2025 the University of Arizona Cooperative Extension asked the state’s commercial grape growers what they had planted, and 67 vineyard locations answered. Between them they reported 76 varieties. The average vineyard grew seven, and one grew 28. Older wine regions rarely look like that. Bordeaux, by comparison, allows a handful of red grapes.

The survey comes with a caution that belongs at the start. Submissions were voluntary, the Extension had identified 74 known commercial operations, and the totals are what growers chose to send in, not a complete census. The figures below come from the 2025 Arizona Wine Grape Harvest Report and the data file behind its dashboards.

What covers the most ground

Growers reported about 703.5 planted acres across the state, and red varieties took 500.3 of them, roughly 71 percent. Syrah leads with 66.1 planted acres. Grenache has 63.6 and Cabernet Sauvignon 58.9. Among the rest, Petite Sirah and Sangiovese have about 31 acres each, Viognier 30.5, Malvasia Bianca 26.2 and Chardonnay 23.8.

The regions lean in different directions. The Willcox AVA holds 404.3 of the planted acres, and its biggest plantings are the same big reds that lead the state. The Verde Valley AVA has 111.8 acres, and there the most planted grape is Sangiovese at 7.2 acres, with Aglianico and Barbera each above six and a half. In the Sonoita AVA, with 54.5 acres, Cabernet Sauvignon comes first, then Petit Verdot and Montepulciano.

Yield tells its own story. Malvasia Bianca produced 79.5 tons from 23.4 harvested acres, about 3.4 tons an acre. Syrah produced 103.9 tons from 51.9 harvested acres, closer to 2 tons an acre. An aromatic white that crops that generously is a useful grape to have when a winery needs volume.

Heat that lasts into the night

Daytime heat is the obvious problem, but the Extension’s climate team pays as much attention to the mornings. In its ripening-season analysis it counts hours below 65°F and above 95°F. Morning minimums above 65°F can speed up the vine’s use of malic acid and leave berries with a higher pH. Afternoon maximums above 95°F can break down anthocyanins, the pigments that color red grape skins. In July 2024 the area-average maximum in the Verde Valley AVA was 103.0°F, against a normal of 98.1°F.

That goes some way to explaining the Italian grapes on the list. Growers want grapes that keep their acidity in a hot season or bring color and tannin to spare. Aglianico, a late-ripening grape from southern Italy, is known for firm acidity and heavy tannin. Barbera holds its acidity well even when ripe. Petite Sirah has thick, dark skins. None of this makes them easy, but it gives a winemaker something to work with in a year when the fruit comes in soft.

April decides a great deal

Heat is only half of the high desert. The town of Willcox sits at about 4,200 feet, and at that height a spring freeze can follow a run of warm days. The Extension’s climate viticulture newsletter for January 2026 set out the numbers from a vineyard near the university’s Willcox Bench weather station, in the Willcox AVA, which holds more than half of the state’s reported acreage. In 2025, 45 variety blocks broke bud between March 29 and April 24. Forty of them had broken bud before the season’s last freeze, on April 20, when the minimum reached 31.8°F.

Records at that station since 2017 put the average last spring freeze on April 5. The earliest was March 20, in 2018, and the latest was that April 20 in 2025. In four of those years no block broke bud before the last freeze. In the others, some did. A variety that wakes late has a better chance of missing the last cold night, which is one reason growers pay attention to bud-break order when they choose what to plant, and why some of them prune as late as they can.

Rain at the wrong moment

July and August are normally the wettest months of the growing season, and they fall while the berries ripen, when rot becomes the worry. Grapes with tight clusters hold water between the berries and dry slowly. The Extension’s guide to grape problems lists loose-clustered varieties among the ways to manage bunch rot. How growers handle the storms at harvest has its own page.

A disease that narrows the choice

The Extension counts Pierce’s disease among the endemic vine diseases in Arizona. A bacterium blocks the vine’s water-conducting tissue, and sharpshooters, a group of leafhoppers, carry it from plant to plant. European wine grapes are susceptible. The Extension’s guide to grape problems puts resistant cultivars first among its measures, which in practice means hybrids bred for the purpose, followed by control of the insects and care in choosing a site. It also names ground near streams and rivers as a place to watch, a point that matters in the Verde Valley, where several vineyards lie along Oak Creek or the Verde River.

Why the list stays long

Money shapes the list as much as climate does. Growers sold 417.4 tons in 2025 at a weighted average of $2,404.54 a ton, with reported prices running from $900 to $3,920. The fruit moved very differently by region. Verde Valley producers kept more than 92 percent of their crop for their own wine, while Cochise County growers supplied more than 80 percent of all the grapes sold to other winemakers in the state.

A small Verde Valley estate that bottles many wines under its own label plants for its own cellar. A Cochise County grower selling fruit plants what buyers will pay for. The survey also counted 171.3 acres that were planted but not picked in 2025, a figure that covers young vines, blocks damaged during the season and fruit left hanging for lack of buyers.

The Extension is collecting a second year of data. Growers have until October 30 to submit their 2026 harvest figures, and the results are due at the Arizona Wine Summit in January 2027.