New Hampshire Planting Zones – Growing Zones Guide

What Planting Zone Is New Hampshire In?

New Hampshire sits in the heart of New England, where elevation, latitude, and distance from the ocean all shape the climate. On the latest 2023 USDA Plant Hardiness Zone Map, New Hampshire spans roughly from zone 3b to zone 6b.

• Mount Washington & High Peaks: Exposed summits such as Mount Washington are in zone 3b, with extreme cold, fierce winds, and a very short growing season.
• Great North Woods & Upper Coös County: Far northern valleys and high plateaus fall mostly in zones 3b–4a, with long, snowy winters and brief summers.
• White Mountains & North-Central Highlands: Towns like Lancaster, Littleton, and North Conway sit mainly in zones 4a–4b, with cool nights and a moderate but frost-prone season.
• Lakes Region & Central Hills: Around Laconia, Lake Winnipesaukee, and the central uplands you’ll find mostly zones 4b–5b, excellent for hardy fruits, vegetables, and perennials.
• Merrimack Valley & Monadnock Region: Concord, Keene, and many interior towns fall in zones 5a–5b, with solid growing seasons and cold but manageable winters.
• Southern Tier & Seacoast: Nashua, Manchester, Dover, Portsmouth, and nearby communities are generally zones 5b–6b, the mildest part of the state with the longest frost-free periods.

USDA Hardiness Zone Map for New Hampshire

The updated 2023 USDA Plant Hardiness Zone Map is based on 30-year averages (1991–2020) of each location’s coldest winter temperatures. In New Hampshire, the map shows a clear gradient: the coldest zones in the high peaks and far north, and progressively warmer zones as you move south toward the Merrimack Valley and the Seacoast.

Official 2023 USDA New Hampshire planting zone map, based on 1991–2020 climate data.

Use the map together with your ZIP code to pinpoint your exact New Hampshire garden zone. Look up your New Hampshire planting zone by ZIP code using the USDA tool, then come back here or visit our Plant Finder for plants tailored to your zone, soil, and sun conditions.

New Hampshire Growing Zones by Region

New Hampshire is small on the map but big on microclimates. Elevation, slope, cold air drainage, proximity to lakes and the ocean, ledge, and even pavement and stone walls can nudge a garden a half to a full zone warmer or colder than the surrounding countryside.

Seacoast & Southern Cities (Approx. Zones 5b–6b)

This region includes the Seacoast (Portsmouth, Dover, Hampton), plus southern cities and suburbs such as Nashua, Manchester, and Salem.

• Relatively mild winters and long frost-free periods make this area excellent for a wide mix of vegetables, small fruits, and ornamental plants.
• Urban heat islands along I-93 and in city centers can shelter borderline-hardy shrubs and perennials on south-facing walls and patios.
• Soils range from sandy along the coast to heavier inland; both benefit from compost, mulching, and attentive watering during summer dry spells.

Merrimack Valley & Central Hills (Approx. Zones 4b–5b)

Concord, Hooksett, Laconia, the Lakes Region, and many central hill towns sit in a transitional band between the milder south and the colder mountains and north.

• Great for hardy fruit trees, cool- and warm-season vegetables, and classic New England perennials.
• Average last frosts often arrive in late May or even early June, with first frosts returning in early–mid September in colder pockets.
• Glacial till and ledgy soils are common—raised beds, generous compost, and mulch go a long way here.

Monadnock Region & Connecticut River Valley (Approx. Zones 4b–5b)

Keene, Peterborough, Hanover, Lebanon, and river towns down the Connecticut Valley experience cold winters, beautiful foliage seasons, and productive summers.

• Valley bottoms can trap cold air (early frosts), while south-facing slopes and river benches behave like a warmer half-zone.
• Excellent for apples, cold-tolerant grapes, berries, and mixed vegetable gardens.
• Wind protection, row covers, and thoughtful siting help stretch the season.

White Mountains (Approx. Zones 3b–4b)

From Franconia Notch and the Presidential Range to North Conway and Jackson, this region is cooler and snowier than most of the state.

• Shorter seasons favor cold-hardy vegetables (brassicas, roots, leafy greens), berries, and perennials adapted to cool nights.
• Average last frosts can linger into late May or early June; first frosts may return by mid–late September, especially in hollows and higher ridges.
• Season extension tools—row covers, low tunnels, cold frames, and greenhouses—are valuable allies.

Great North Woods (Approx. Zones 3b–4a)

Far northern New Hampshire—Pittsburg, Colebrook, and the upper Connecticut River Valley—has some of the coldest winters in the state.

• Very cold winters and a short growing window; focus on hardy perennials, conifers, native shrubs, and fast-maturing vegetables.
• Average last frosts may not arrive until late May or early June; first frosts often return in September.
• Choose wind-sheltered sites, darker mulch to warm soil, and cold-tolerant varieties to make the most of the season.

Best Plants for New Hampshire Planting Zones

Once you know your New Hampshire planting zone—and whether you garden on a windy ridge, in a sheltered river valley, or near the moderating ocean—you can work with your climate. Focus on plants rated for your hardiness zone (3–6) and time annual crops around your local frost dates and soil conditions.

Vegetables for New Hampshire Growing Zones

• Cool-season crops (spring and fall statewide): lettuce, spinach, arugula, kale, collards, peas, broccoli, cabbage, carrots, beets, parsnips, turnips, and radishes.
• Warm-season crops (plant after your last frost): tomatoes, peppers, zucchini and other summer squash, pumpkins, cucumbers, beans, and sweet corn.
• Short-season & high-elevation favorites (zones 3–4): Quick-maturing salad mixes, baby carrots, radishes, bush beans, compact determinate tomatoes, and cold-frame greens help mountain and northern gardeners harvest more in less time.

Fruits & Trees for New Hampshire Hardiness Zones

• Statewide staples (zones 3–6): apples, pears, cherries, and hardy plums thrive when matched to appropriate rootstocks and sited away from frost pockets.
• Small fruits: grapes, strawberries, highbush and lowbush blueberries, currants, and hardy blackberries and raspberries are naturals for New Hampshire’s acidic soils.
• Warm-pocket experiments (mild zone 6 sites): In sheltered, south-facing courtyards along the southern border or Seacoast, adventurous gardeners may trial hardy figs or keep citrus and other tender fruit trees in containers that overwinter indoors.

Flowers & Ornamentals for New Hampshire Garden Zones

• Reliable perennials: coneflower, black-eyed Susan, yarrow, catmint, lavender (in well-drained spots), and ornamental sages suit sunny beds in zones 4–6.
• Shade-garden classics: Hostas, ferns, heucheras, astilbes, and woodland phlox brighten understories in older neighborhoods and forests.
• Structural plants: flowering dogwood (in milder sites), serviceberry, hydrangeas, lilacs, and ornamental grasses provide four-season interest and wildlife shelter.

Native Plants for New Hampshire Landscapes

New Hampshire native plants are adapted to local soils, rainfall, and wildlife, making them resilient and ecologically powerful. Mix native wildflowers, shrubs, grasses, and trees for a landscape that looks at home in the Granite State and supports bees, butterflies, and songbirds.

• Native wildflowers: bee balm (Monarda), New England aster (Symphyotrichum novae-angliae), goldenrod (Solidago spp.), wild columbine (Aquilegia canadensis), and trilliums for woodland gardens.
• Native grasses: little bluestem (Schizachyrium scoparium), switchgrass (Panicum virgatum), and tufted hairgrass (Deschampsia cespitosa) for meadows and borders.
• Native shrubs & trees: sugar maple, white pine, paper birch, red maple, red oak, American hazelnut, and winterberry holly for structure, fall color, and wildlife food.

Browse curated lists like great pollinator plants for New Hampshire and monarch nectar plants for New Hampshire to build a New Hampshire garden that hums with life from spring ephemerals through snowy evergreens.

Interactive New Hampshire Planting Calendar (General Guide)

Tap a month to see what to plant in New Hampshire by zone. Use this as a starting point, then adjust for your exact frost dates, elevation, and whether you garden on the Seacoast, in the Merrimack Valley, or in the mountains and far north.

New Hampshire Gardening Tips by Zone

New Hampshire gardeners juggle rocky soils, cold winters, blackflies, deer and moose, surprise spring frosts, and rapidly changing weather. These tips help your plants thrive from zone 3b to 6b:

• Know your microclimate. A sheltered Seacoast backyard may behave like a warmer zone 6b, while a windy White Mountain ridge feels like zone 3—even if maps say otherwise.
• Time your seasons. In the south and along the coast, you can plant earlier and harvest later. In central and northern zones, rely on compact, quick-maturing varieties and season extension.
• Improve challenging soils. Much of New Hampshire has stony, acidic, or compacted soils. Add compost regularly, test pH, and consider raised beds for vegetables and herbs.
• Water wisely. Use drip irrigation or soaker hoses under mulch to conserve water and limit foliar diseases during humid spells.
• Use mulch generously. Organic mulches moderate soil temperature, suppress weeds, and reduce splash-borne diseases on tomatoes, roses, and cucurbits.
• Rotate crops. Moving plant families around the garden each year helps manage pests and soil-borne diseases, especially in small vegetable plots.
• Plan for wildlife. Fencing, tree guards, and resistant plant choices help you coexist with deer, rabbits, voles, and the occasional moose.
• Lean on natives. Let native trees, shrubs, and perennials form the backbone of your landscape, with tender or thirsty plants tucked into key protected spots.