When to Plant in Manchester, NH

Manchester, NH is Zone 5b — one of the colder climates for vegetable gardening in the Northeast. The average last frost falls around May 11, giving you a frost-free window of roughly 140 days. Winters are cold and snowy, springs are short, and summers are warm and humid.

The key to success in Manchester is maximizing every day of your growing season. Start seeds indoors early (late February through March), use row covers and cold frames to extend spring and fall, and choose short-season varieties that mature before the first fall frost around September 26.

What to plant now in Manchester

Early Spring (Apr–May): Cold-hardy crops — lettuce, peas, spinach, kale, and broccoli transplants as soon as soil is workable.
Spring: After last frost around May 11 — tomatoes, peppers, squash, beans, cucumbers, and corn.
Summer: Maintain warm-season garden. Choose short-season varieties for reliable harvest.
Fall: Quick-maturing cool-season crops — lettuce, spinach, radishes — for September harvest before first frost.

In Manchester (138 frost-free days, a moderate season), 38 of 56 planner crops fit outright, 17 get two plantings, 1 crop is perennial.

Month by month in Manchester

Month	What to do
January	Order seeds. Plan garden layout. Research short-season varieties.
February	Start onion seeds indoors. Prepare for seed starting season.
March	Start tomatoes, peppers, and eggplant seeds indoors (8–10 weeks before last frost).
April	Direct sow peas, spinach, and lettuce outdoors. Transplant brassicas with frost protection.
May	After May 11 last frost — transplant all warm-season crops. Direct sow beans and squash.
June	Summer garden in full swing. Plant cucumbers and corn.
July	Harvest and maintain. Start seeds for fall crops.
August	Direct sow quick fall crops: lettuce, spinach, radishes. Race to beat first frost.
September	Harvest fall crops quickly. First frost arrives around September 26. Protect tender plants.
October	Hard frosts. Harvest remaining crops. Plant garlic for next year.
November	Garden winds down. Clean up beds and add compost.
December	Rest season. Review the year and plan next season.

Frost dates for Manchester ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
03103	May 11	September 30	6a

FAQ

When is the last frost date in Manchester, NH?

Manchester's average last frost date is around May 11. Start warm-season seeds indoors in mid-March and don't transplant outside until after May 11.

When is the first fall frost in Manchester?

Manchester's first fall frost typically arrives around September 26 — giving you about 140 frost-free days. Choose short-season tomato varieties (under 70 days) for reliable harvests.

What vegetables grow well in Manchester, NH?

Cool-season crops excel: peas, lettuce, spinach, kale, broccoli, carrots, and beets. Warm-season crops like tomatoes, beans, and squash do well with the right variety selection and a head start indoors.

What's the secret to gardening in a short-season climate like Manchester?

Start seeds early indoors, use cold frames or row covers to extend spring and fall by 3–4 weeks, and choose short-season varieties (look for 60–75 day tomatoes). Every day counts with a 140-day window.

How does Plan My Garden help Manchester gardeners?

Enter your Manchester zip code and we'll calculate exact planting dates for all your crops — building in the seed start timing you need for New Hampshire's short growing season.

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