What Are Autumn Crisp Grapes? Origin, Flavor, and Season Guide

Walk into the produce aisle in late September and you will spot oversized, milky-green clusters labeled AUTUMNCRISP®. Most shoppers ask the same thing at the bin. So what are Autumn Crisp grapes, where do they come from, and why do they taste so different from any other green grape on the shelf?

Autumn Crisp grapes are a late-season, seedless green table grape that Sun World International developed in California. Sun World owns the AUTUMNCRISP® trademark and Sugra35 code. Shoppers prize them for jumbo berries, dense crunch, and sweet muscat flavor.

Where Autumn Crisp Grapes Came From

Autumn Crisp is the brand name for Sugra35, a seedless green grape cultivar that Sun World International developed at its Bakersfield, California breeding facility. Breeder Michael Striem selected the variety after roughly 30 years of work. The USPTO then granted the plant patent in November 2009, and the first commercial harvest followed in 2012.

Four parent varieties shaped the final cross. First, Italia contributed berry size. Next, Muscat of Alexandria added flavor depth. Then Dzhidzhigi Kara, an heirloom from Turkmenistan, brought firmness. Finally, Sun World’s own Sugraone supplied the seedless trait. As a result, growers now get a fall grape that holds its texture longer than almost any other green table variety on shelves today.

What Autumn Crisp Grapes Look Like

The berries run unusually large. Most fall in the round to slightly oval range, and they look noticeably bigger than a Thompson Seedless. As for color, the skin shows a pale, milky green-yellow that almost looks dusty under store lights. In addition, cluster shape stays firm and tight, unlike the loose hang of some older varieties.

When you bite one, the skin barely registers. Instead, the flesh snaps like an apple slice. In fact, that trademark crunch is the variety’s calling card, and it is the single reason most shoppers come back for more.

What Do Autumn Crisp Grapes Taste Like?

Autumn Crisp grapes taste sweet up front with a clean finish and a soft floral muscat note in the background. Sun World describes the flavor as muscat undertones with hints of citrus, rose, and peach. At harvest, brix sits around 17 degrees, which puts the fruit firmly in the sweet category without crossing into syrupy.

Compared to a Cotton Candy grape, the flavor reads more refined. On the other hand, it is far less neutral than a standard Thompson. For shoppers wondering how patented specialty varieties get their flavors, the breakdown on whether cotton candy grapes occur naturally gives useful background on how this kind of breeding works.

When Are Autumn Crisp Grapes in Season?

Autumn Crisp grapes hit US stores from September through October, when growers in the San Joaquin Valley pull the California crop off the vine. Then a second window opens from late January through May as imported fruit arrives from Peru and Chile, where the seasons run opposite ours. As a result, shoppers see the brand again in late winter at chains like Aldi, Costco, and Sam’s Club.

Where Autumn Crisp Grapes Are Grown

Sun World International licenses the variety to growers in California, Mexico, Peru, Chile, Spain, Portugal, Italy, Israel, Brazil, South Africa, and Australia. California’s hot, dry San Joaquin Valley produces the bulk of the fall US crop, with most acreage clustered around Bakersfield and Delano. Meanwhile, Peru’s Ica region supplies the winter and early-spring shelf.

Climate matters here. The variety needs hot, dry summers and warm fall days to reach full sweetness. For example, cooler regions like Kansas, where I farm, do not accumulate the heat units to bring the fruit in at proper brix. So you will not see Midwest-grown Autumn Crisp at any commercial scale.

Are Autumn Crisp Grapes GMO?

Autumn Crisp grapes are not GMO. Sun World created them through traditional cross-pollination, which is the same approach behind most modern fruit and field crop breeding. If you want a deeper look at how that compares to older varieties, the differences between hybrid and heirloom seed types apply to grapes too. In addition, Sun World’s commercial packs carry the Non-GMO Project Verified label. The variety holds a US plant patent because it is a unique cross, not because Sun World used any laboratory gene editing.

Are Autumn Crisp Grapes Seedless?

Yes, Autumn Crisp grapes are completely seedless. The seedless trait carries over from Sugraone, one of the parent varieties in the cross. Because the flesh also stays firm, eating them by the handful feels effortless, which is exactly the snacking experience Sun World designed them for.

How Autumn Crisp Grapes Compare to Other Green Grapes

Autumn Crisp grapes stand apart from older green varieties on three points. First, the berries grow larger than Thompson Seedless. Next, the crunch holds firmer than Sugraone or Superior. Finally, shelf life beats most other seedless greens at retail.

If you want to see how another patented specialty stacks up on the seed question, the explainer on whether cotton candy grape varieties stay truly seedless covers the closest comparable branded grape.

Are Autumn Crisp Grapes Healthy?

Autumn Crisp grapes match other table grapes nutritionally. For example, a one-cup serving runs about 100 calories with natural sugars, vitamin C, vitamin K, and antioxidants like resveratrol and flavonoids. They also stay fat-free and cholesterol-free. The sugar count sits a touch higher than a Thompson because of the higher brix at harvest. Still, the difference stays small in a normal serving.

How to Store Autumn Crisp Grapes

Store Autumn Crisp grapes unwashed in their original clamshell or bag in the refrigerator crisper drawer at 30 to 32 degrees Fahrenheit with high humidity. When you store them properly, they hold their snap and flavor for up to two weeks. Wash only the amount you plan to eat. In addition, they freeze well for up to three months and make a solid frozen snack straight from the bag. For broader cold-chain context, the basics in proper post-harvest crop handling apply to table grapes too.

Where to Buy Autumn Crisp Grapes

Autumn Crisp grapes show up at major US retailers, including Costco, Sam’s Club, Aldi, Whole Foods, Kroger, and many regional chains during the September-October domestic window. Then they return from late January through April or May as imports arrive. Look for the AUTUMNCRISP® brand label on the clamshell, since the trademark guarantees you get actual Sugra35 fruit instead of a look-alike green grape.

Commercial packs carry a U.S. No. 1 grade under the USDA Agricultural Marketing Service grade standards for table grapes, which set the size, color, and defect tolerances every commercial shipper must meet.

Why Autumn Crisp Grapes Cost More

Autumn Crisp grapes cost more than standard green grapes because they are a patented variety. First, growers pay license fees to Sun World International. In addition, workers hand-harvest and pack the berries to protect the large clusters, and yield per acre runs lower than older varieties. As a result, the cost flows through to retail. For example, expect to pay 25 to 50 percent more per pound than Thompson Seedless during the same season.

What This Means Next Time You See Them in the Store

Autumn Crisp grapes are a modern, patented green table grape designed around three things: size, crunch, and shelf life. They are not GMO. Also, this is not a wine grape. And they differ entirely from Thompson Seedless or Cotton Candy. The September-October window in the US gives you the freshest fruit. If you find them in January or February, those came up from Peru or Chile. Either way, you are eating Sugra35, and that crunch you hear at the first bite is exactly what Sun World spent three decades chasing.