Frontenac Grape
Frontenac Grape
A Vigorous, Ultra-Hardy Red Wine Grape Bred for the North
Frontenac Grape (Vitis 'Frontenac') is the grape that put cold-climate winemaking on the map — a University of Minnesota release hardy to roughly -30°F, with vigorous vines that ripen heavy clusters of small, deep-blue berries for bold red and rosé wines. It's self-fertile, disease-resistant, and productive, needing only full sun and a sturdy trellis. Whether you're starting a backyard vineyard in Edina, covering an arbor in Maple Grove, or growing your own wine grapes in Woodbury — Frontenac thrives in zone 4b–5a (and colder) gardens.
Frontenac Grape Plant Details
| Attribute | Detail |
|---|---|
| Scientific Name | Vitis 'Frontenac' (U of MN) |
| Plant Type | Deciduous fruiting vine (wine grape) |
| Mature Length | 15–20+ feet on a trellis; train to your system |
| Sun | Full sun (8+ hours) for ripening and sugar |
| Water | Moderate while establishing; fairly drought-tolerant once rooted |
| USDA Zones | 3–8 (Twin Cities is zone 4b–5a); hardy to about -30°F |
| Soil | Well-draining; tolerates a range of soils. Avoid wet, low spots; good air drainage reduces disease. |
| Pollination | Self-fertile — a single vine will fruit |
| Use | Red and rosé wine; high sugar with bright acidity |
| Harvest | Mid- to late September in the Twin Cities |
| Winter Hardiness | Exceptional — among the hardiest wine grapes, to roughly -30°F |
Frontenac Grape Uses in Minnesota Landscapes
Backyard vineyard
Frontenac is the backbone of many Minnesota home and commercial vineyards. Train it on a two-wire trellis in full sun in a Plymouth yard for reliable crops.
Arbors and screens
Its vigor makes it excellent for covering an arbor or pergola, giving summer shade plus a fall grape harvest in Eden Prairie.
Wine and juice
Known for deep color and bright cherry notes, Frontenac makes robust reds, rosés, and port-style wines, plus juice and jelly.
Best Time to Plant Frontenac Grape in Minnesota
Plant in spring (late April–May) after hard frost so the vine has a full season to establish. Fall planting is not recommended for grapes here. Never plant after mid-October.
How to Plant Frontenac Grape
- Choose the sunniest, best-drained spot you have — a south or west slope is ideal for ripening and air drainage.
- Install the trellis before or at planting; grapes need sturdy support from year one.
- Dig a hole 2–3× the root width; backfill with native soil and some compost. Don't over-fertilize.
- Space vines 6–8 feet apart along the trellis.
- Water in well and mulch lightly, keeping mulch off the trunk.
- The first two years, train a single strong trunk and remove fruit so the vine builds structure.
Watering Frontenac Grape in Minnesota
First Year Watering Schedule
- Weeks 1–2: Every 2–3 days, deep and slow
- Month 1–2: Every 4–5 days
- Month 3–6: Weekly; deep but infrequent watering encourages deep roots
- Stop watering 2–3 weeks before ground freeze (typically late October in the Twin Cities).
After Year One
Established vines are fairly drought-tolerant; water only during extended dry spells. Avoid keeping the root zone constantly wet, which invites disease.
When and how do I prune grapes?
Prune in late winter while fully dormant, removing about 80–90% of the previous year's growth. Grapes fruit on new shoots from one-year-old wood, so annual hard pruning is essential for good crops.
Do I need two vines?
No — Frontenac is self-fertile and fruits on its own.
Will it survive a Minnesota winter?
Yes — it's one of the hardiest wine grapes, surviving to about -30°F without burial. Good site air drainage matters more than winter protection here.
You May Also Like
- Frontenac Gris Grape — the white-wine mutation with peach and apricot notes
- Marquette Grape — a complex, hardy red from the same breeding program
- St. Croix Grape — a hardy red for wine and fresh eating
How Many Frontenac Grapes Do I Need?
Space vines 6–8 ft apart along a sturdy two-wire trellis. One self-fertile vine fruits on its own; a short row builds a real backyard vineyard.
| Trellis Length | Vines Needed (~7 ft spacing) |
|---|---|
| 14 ft | 3 |
| 21 ft | 4 |
| 28 ft | 5 |
| 35 ft | 6 |
Frontenac Grape Season-by-Season in Minnesota
- Spring: Buds break on one-year-old wood after late-winter pruning; new fruiting shoots extend fast.
- Summer: Vigorous growth blankets the trellis; clusters of small blue berries size up in full sun.
- Fall: Heavy deep-blue clusters ripen mid- to late September for bold reds and rosés; foliage colors before drop.
- Winter: Fully dormant; one of the hardiest wine grapes (to about -30°F), it needs no burial here.
At a Glance
✔ Edible ✔ Drought-Tolerant
Plant It With
- Frontenac Gris Grape — the white-wine mutation with peach and apricot notes.
- Marquette Grape — a complex hardy red from the same U of MN program.
- St. Croix Grape — a hardy red for wine and the table.
- La Crescent Grape — an aromatic white to round out a home vineyard.
Is Frontenac Grape Right for Your Yard?
Frontenac wants the sunniest, best-drained spot you have — ideally a south or west slope with good air movement — plus a strong trellis and annual hard pruning, and it pays you back with reliable cold-climate wine grapes. It's not a fit for a low, wet, frost-pocket site or a shady yard, where it won't ripen and disease pressure climbs.