Best Vegetables to Grow in New Hampshire

Peas germinate in soil as cold as 40°F and actually stall in heat, making New Hampshire's long cool spring ideal. Direct-sow as soon as the ground can be worked — often early to mid-April — and you'll be harvesting by late June before summer heat arrives. Choose snap varieties like 'Sugar Ann' (56 days) for the fastest return.

Broccoli heads best when temperatures stay between 45–75°F, exactly the conditions New Hampshire delivers in May and June. Start seeds indoors 6–8 weeks before last frost and transplant out under row cover in late April; a light frost after transplanting won't hurt established starts. For a fall crop, count back 80 days from your first fall frost date and direct-sow or transplant in mid-July.

Cabbage tolerates hard frosts once established and can be harvested after light freezes, which actually improve flavor. Start transplants indoors in March, set out in late April, and target early varieties like 'Parel' (55 days) to guarantee a head before the season closes. A late-summer direct sowing for fall harvest is equally reliable in most of New Hampshire.

Cauliflower is the most temperature-sensitive brassica — it buttons prematurely in heat and stalls in cold — but New Hampshire's narrow cool window is genuinely what it wants. Start indoors 6 weeks before transplant, get plants out by early May under row cover, and choose heat-tolerant varieties like 'Cheddar' to buffer against early warm spells. Blanch heads by folding outer leaves over them as soon as the curd is golf-ball size.

Kale is arguably the most forgiving vegetable for short-season climates: it germinates quickly, tolerates frost down to the mid-20s°F, and becomes sweeter after a hard freeze. Direct-sow in late April or start transplants in March; a July sowing yields a fall and early-winter harvest. 'Red Russian' and 'Winterbor' are proven performers that hold well into November even in northern New Hampshire.

Lettuce's 30–60 day maturity makes it one of the few crops you can succession-sow every 2–3 weeks from late April through early August and still get full heads before frost. It bolts in heat, so time your last sowing to mature in September's cooler temperatures. Loose-leaf types like 'Black Seeded Simpson' are more forgiving of temperature swings than heading types.

Spinach germinates in near-freezing soil and can be sown under a cold frame in late March, giving New Hampshire gardeners edible greens before most crops are even planted. It bolts quickly once days exceed 14 hours and temperatures climb, so treat it as a strict spring and fall crop. 'Tyee' holds up longer before bolting than most varieties and is worth seeking out.

Swiss chard spans both the cool and warm parts of New Hampshire's season — it handles spring frosts and midsummer heat that would bolt spinach or lettuce. One direct sowing in mid-May produces harvests from June through hard frost in October, making it exceptional value per row-foot. Cut outer leaves continuously rather than harvesting the whole plant to extend production all season.

Carrots need about 75 frost-free days to full size but tolerate light frost at both ends, fitting comfortably into New Hampshire's season if sown by late May. Cold soil (below 50°F) dramatically slows germination, so wait until the soil has warmed or use row cover to accelerate it. Short-rooted Chantenay and Nantes types handle New Hampshire's heavier soils better than long Imperator varieties.

Beets mature in 50–70 days and tolerate light frost, making them one of the most reliable root crops for Zone 5. Direct-sow in late April as soon as soil is workable and again in mid-July for a fall harvest that can be dug after light frosts. 'Detroit Dark Red' is a proven standard; thin seedlings to 3 inches early — skipping this step is the most common reason for small beets.

At 25–35 days, radishes are the fastest crop in the New Hampshire garden and serve as both a quick harvest and a row marker for slower-germinating vegetables like carrots. Sow every 10 days from late April through May, then pause during the heat of July, and resume in August for a fall crop. Daikon types sown in August grow large by October and store well through winter.

Onions require 100–120 days and need to be started from transplants or sets, not direct-sown seed, to fit New Hampshire's season. Set out transplants or sets as early as late April — they tolerate hard frost — and choose intermediate-day or long-day varieties like 'Copra' or 'Walla Walla' suited to northern latitudes. Harvest when tops fall over naturally, then cure in a warm, dry spot for 2–3 weeks before storage.

Garlic is planted in fall — late September to mid-October in New Hampshire — overwinters under a straw mulch, and is harvested the following July, entirely sidestepping the short-season problem. Hardneck varieties like 'German Red' or 'Music' are specifically adapted to cold climates and develop better flavor than softneck types in Zone 5. Plant cloves 2 inches deep, pointy side up, 6 inches apart, and mulch heavily after the ground starts to freeze.

Strawberries are perennial in Zone 5 and reward the one-time planting with harvests for 3–5 years, making them efficient for short-season gardens. June-bearing varieties like 'Honeoye' — bred at Cornell for northeastern conditions — peak in late June to early July, aligning perfectly with New Hampshire's longest days. Plant in spring, remove all blossoms the first year to strengthen roots, and mulch with straw before winter to protect crowns.