New Hampshire’s cold winters and rocky soils favor early-ripening hybrid grapes over traditional European vinifera. If you’re searching for the best grapes to grow in new hampshire, you need varieties that can survive -20°F winters and short growing seasons. This guide covers the top performers for your Granite State vineyard or backyard trellis.
Growing grapes here is a rewarding challenge. The key is picking the right cultivars that laugh at frost and ripen before the first hard freeze. Let’s look at what works best in New Hampshire’s unique climate.
Best Grapes To Grow In New Hampshire
These are the top grape varieties proven to thrive in New Hampshire’s conditions. Each one has been tested by local growers and university extension programs.
Frontenac
Frontenac is a powerhouse for cold climates. It was developed by the University of Minnesota and handles temperatures down to -35°F. This red wine grape ripens early, usually by mid-September in most New Hampshire locations.
- Excellent disease resistance, especially against powdery mildew
- Produces deep red wines with cherry and plum notes
- Vigorous grower that needs regular pruning
- Works well for both wine and juice
Marquette
Marquette is another University of Minnesota success story. It’s become a favorite among New Hampshire winemakers for its complex flavor profile. It ripens even earlier than Frontenac, making it ideal for shorter seasons.
- Survives -30°F without damage
- Produces medium-bodied red wines with spice notes
- Good resistance to black rot and downy mildew
- Requires less spraying than many hybrids
La Crescent
La Crescent is the go-to white grape for cold regions. It has a distinct apricot and citrus aroma that makes excellent aromatic white wines. It’s hardy to -30°F and ripens in early September.
- High sugar content ideal for dessert wines
- Moderate disease resistance, needs good air flow
- Can be trained on high wire trellis systems
- Produces well even in marginal soils
St. Croix
St. Croix is a versatile red grape that does well in New Hampshire’s variable weather. It was bred in Minnesota specifically for harsh winters. It’s one of the most reliable producers in the state.
- Hardy to -30°F with proper site selection
- Matures fruit in late August to early September
- Makes good table wine and jelly
- Thrives in sandy loam soils common in southern NH
Edelweiss
Edelweiss is a white grape with excellent cold hardiness and disease resistance. It was developed in South Dakota and handles New Hampshire’s humidity well. It’s a good choice for beginners.
- Survives -25°F without protection
- Produces sweet, fruity white wines
- Very resistant to fungal diseases
- Needs less pruning than other varieties
Site Selection And Preparation
Choosing the right spot is as important as picking the right grape. New Hampshire’s topography varies greatly from the seacoast to the mountains.
Sunlight Requirements
Grapes need full sun for at least 6-8 hours daily. South-facing slopes are ideal in New Hampshire because they capture maximum warmth. Avoid north-facing slopes that stay cool and damp.
Soil Conditions
Well-drained soil is critical. Grapes hate wet feet. Sandy loam or gravelly soils work best. If you have heavy clay, consider raised beds or mounding.
- Test your soil pH first. Aim for 5.5 to 6.5
- Add lime if pH is too low
- Work in organic matter like compost
- Ensure drainage by digging a test hole
Wind Protection
Winter winds can desiccate grape vines. Plant near a windbreak like a building or evergreen hedge. This reduces winter kill and helps maintain moisture.
Planting And Trellising
Proper planting sets your vines up for success. Trellising keeps them healthy and productive.
When To Plant
Spring planting is best in New Hampshire. Wait until after the last frost, usually mid-May. Fall planting is risky because young vines may not establish before winter.
Spacing Guidelines
Give your vines room to grow. Crowded vines get more disease.
- Space vines 6-8 feet apart in rows
- Rows should be 8-10 feet apart
- This allows air circulation and equipment access
Trellis Systems
A strong trellis is essential. The most common system in New Hampshire is the high cordon.
- Set 6-foot posts 20 feet apart
- Run two wires at 3 and 5 feet high
- Train the main trunk up to the top wire
- Allow canes to grow along the wires
Care And Maintenance
Grapes need regular care to produce well. Neglected vines become tangled and unproductive.
Pruning
Pruning is the most important task. Do it in late winter while vines are dormant. Remove 80-90% of last year’s growth.
- Use sharp, clean pruners
- Leave 2-3 bud spurs on each arm
- Remove dead or diseased wood first
- Thin out crowded canes
Fertilizing
Grapes don’t need heavy fertilizer. Too much nitrogen causes leafy growth at the expense of fruit.
- Apply a balanced 10-10-10 fertilizer in spring
- Use about 1/4 pound per vine for young plants
- Increase to 1/2 pound for mature vines
- Compost tea is a good organic option
Watering
Young vines need regular water. Established vines are drought tolerant but benefit from deep watering during dry spells.
- Water deeply once a week in dry periods
- Use drip irrigation to keep leaves dry
- Mulch around base to retain moisture
- Stop watering 2 weeks before harvest
Pest And Disease Management
New Hampshire’s humid summers can bring fungal issues. Prevention is easier than cure.
Common Diseases
Black rot and powdery mildew are the biggest threats. Downy mildew can also appear in wet years.
- Choose resistant varieties like Frontenac
- Prune for good air circulation
- Apply fungicide sprays when needed
- Remove infected leaves and fruit promptly
Pests To Watch For
Birds and deer are the main animal pests. Japanese beetles can also be a problem.
- Use bird netting over ripening fruit
- Install deer fencing around the vineyard
- Hand pick Japanese beetles into soapy water
- Encourage beneficial insects like ladybugs
Harvesting And Using Your Grapes
Knowing when to pick is key. Grapes don’t ripen after harvest, so timing matters.
When To Harvest
Taste is the best indicator. Grapes should be sweet and flavorful. Color change alone isn’t enough.
- Check sugar levels with a refractometer if possible
- Look for 18-22% sugar for wine grapes
- Table grapes should be fully colored and sweet
- Harvest in the morning when grapes are cool
Storage Tips
Fresh grapes last about 2 weeks in the refrigerator. For longer storage, consider making juice or wine.
- Keep grapes in perforated plastic bags
- Don’t wash until ready to eat
- Freeze whole grapes for later use
- Make jelly or jam with excess fruit
Winter Protection
Even hardy varieties benefit from some winter care. New Hampshire winters can be brutal.
Mulching
Apply a thick layer of mulch around the base after the ground freezes. This insulates roots from temperature swings.
- Use straw, wood chips, or leaves
- Apply 4-6 inches deep
- Remove mulch in early spring
- Don’t let mulch touch the trunk
Trunk Protection
Young vines are most vulnerable. Wrap trunks with insulating material for the first few winters.
- Use commercial tree wrap or burlap
- Wrap from base up to the first wire
- Remove wrap in spring to prevent rot
- Consider snow cover as natural insulation
Frequently Asked Questions
What is the easiest grape to grow in New Hampshire?
Edelweiss is often the easiest for beginners. It has excellent disease resistance and doesn’t need complicated pruning. It also ripens reliably even in cooler summers.
Can I grow table grapes in New Hampshire?
Yes, but choose cold-hardy varieties. Swenson Red and Reliance are good table grape options. They have thinner skins and sweeter flavor than wine grapes.
How long does it take for grape vines to produce fruit?
Most vines start producing in their third year. You’ll get a small crop then, with full production by year five. Patience is key with grapes.
Do I need to spray grapes in New Hampshire?
It depends on the variety and weather. Resistant hybrids like Frontenac need minimal spraying. In wet years, a few fungicide applications may be necessary to prevent black rot.
What is the best trellis for New Hampshire grapes?
The high cordon system works best for most home growers. It’s simple to build and maintain. For commercial operations, a vertical shoot positioning system is common.
Growing the best grapes to grow in new hampshire takes some effort, but the rewards are worth it. Start with proven varieties like Frontenac and Marquette. Give them good site conditions and regular care. Within a few years, you’ll be enjoying your own homegrown grapes and wine. Remember to choose varieties matched to your specific microclimate. Southern New Hampshire has slightly milder winters than the northern regions. Adjust your choices accordingly. With the right approach, you can have a productive vineyard even in this challenging climate. Happy growing in the Granite State.