Saint Theresa Grape Vine

Saint Theresa is a cold-hardy purple grape that takes “cold hardy” to a level most varieties never approach — surviving temperatures as low as –30°F, making it one of the most cold-tolerant grape varieties available anywhere. Mostly seedless, vigorous, and producing large, firm, juicy purple grapes with excellent sweet slip-skin flavor in early September, it’s an outstanding choice for northern gardeners who have given up on growing quality grapes in their climate. Its tolerance for alkaline soil adds yet another layer of adaptability. Self-pollinating, partial shade tolerant, and beautiful on an arbor or screen.

Cold Hardy to –30°F — Grapes for the Far North

–30°F cold hardiness puts Saint Theresa in a category almost entirely its own among grape varieties. Where other grapes require winter protection or simply die back in severe cold, Saint Theresa survives and produces reliably year after year in climates that would destroy less hardy varieties. For gardeners in the northern United States and Canada who have struggled to find a quality grape variety that truly thrives in their winters, Saint Theresa is the answer.

Alkaline Soil Tolerant — Unusually Adaptable

Most grape varieties prefer acidic to neutral soil conditions and struggle in alkaline soils. Saint Theresa’s tolerance for alkaline soil opens quality grape growing to sites and regions where standard varieties would underperform — a practical advantage for gardeners dealing with naturally high-pH soils who want a dependable, beautiful vine.

Mostly Seedless Purple Grapes With Slip-Skin Flavor

Saint Theresa’s mostly seedless large purple grapes have the classic slip-skin character that grape enthusiasts love — the skin slips easily from the sweet, firm, juicy flesh for a fresh-eating experience that’s satisfying and enjoyable. Early September ripening brings in the harvest at the beginning of fall, and the vigorous vine performs beautifully on an arbor, trellis, or screen where its growth and fruit display can be fully appreciated.

Why Growers Choose Saint Theresa

• Cold hardy to –30°F — one of the most cold-tolerant grape varieties available
• Alkaline soil tolerant — adaptable where most grapes won’t perform
• Mostly seedless large purple grapes — sweet, firm, juicy slip-skin flavor
• Early September harvest — reliable fall timing across Zones 4–9
• Vigorous arbor and screen performer — beautiful and productive on any support structure
• Partial shade tolerant — flexible siting in home gardens
• Self-pollinating — productive with just one vine