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.

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.

Frost dates for Manchester ZIP codes

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