Calendars by city / NH
Concord, New Hampshire vegetable planting calendar
Planting windows for Concord, New Hampshire built from the NOAA 1991–2020 freeze normals at CONCORD MUNICIPAL AIRPORT, NH US (station USW00014745), not from a hardiness zone.
Concord, New Hampshire planting dates for 27 vegetables
The same windows as a table
Each row applies a published extension rule to the frost dates above. Hardy crops go out 2–4 weeks before the last frost; semi-hardy crops 0–2 weeks before; tender crops around the frost date; very tender crops 2 or more weeks after. The last fall planting date counts the crop's days to harvest back from the first fall frost. The rules and their sources are on the methodology page.
| Crop | Frost class | Start seeds indoors | Plant outdoors | Last fall planting | Days to harvest |
|---|---|---|---|---|---|
| Beets | Semi-hardy | — (direct sow) | Direct sow: Apr 29 – May 13 | Aug 8 | 60 |
| Broccoli | Hardy | Feb 25 – Mar 25 | Transplant: Apr 15 – Apr 29 | Aug 10 | 65 (from transplant) |
| Cabbage | Hardy | Feb 25 – Mar 25 | Transplant: Apr 15 – Apr 29 | Jul 21 | 85 (from transplant) |
| Carrots | Semi-hardy | — (direct sow) | Direct sow: Apr 29 – May 13 | Jul 29 | 70 |
| Cauliflower | Semi-hardy | Mar 11 – Apr 8 | Transplant: Apr 29 – May 13 | Aug 3 | 65 (from transplant) |
| Kohlrabi | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Aug 25 | 50 |
| Lettuce (leaf) | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Aug 15 | 60 |
| Onions (green) | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Aug 15 | 60 |
| Onions (dry, from seed) | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Jun 26 | 110 |
| Onions (dry, from sets) | Hardy | — (direct sow) | Plant sets: Apr 15 – Apr 29 | Jun 26 | 110 |
| Parsnips | Semi-hardy | — (direct sow) | Direct sow: Apr 29 – May 13 | Jul 29 | 70 |
| Peas | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Aug 10 | 65 |
| Potatoes | Semi-hardy | — (direct sow) | Plant seed potatoes: Apr 29 – May 13 | No separate fall sowing | 125 |
| Radishes | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Sep 14 | 30 |
| Spinach | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Sep 4 | 40 |
| Swiss chard | Semi-hardy | — (direct sow) | Direct sow: Apr 29 – May 13 | Aug 8 | 60 |
| Turnips | Hardy | — (direct sow) | Direct sow: Apr 15 – Apr 29 | Aug 25 | 50 |
| Snap beans | Tender | — (direct sow) | Direct sow: May 13 – May 20 | Aug 1 | 60 |
| Cantaloupe | Very tender | May 6 – May 27 | Direct sow (or transplant): May 27 – Jun 10 | No separate fall sowing | 85 |
| Sweet corn | Tender | — (direct sow) | Direct sow: May 13 – May 20 | Jul 2 | 60–90 |
| Cucumbers | Tender | Apr 22 – May 6 | Direct sow (or transplant): May 13 – May 20 | Aug 6 | 55 |
| Eggplant | Very tender | Mar 25 – Apr 29 | Transplant: May 27 – Jun 10 | Aug 1 | 60 (from transplant) |
| Peppers | Very tender | Apr 1 – Apr 29 | Transplant: May 27 – Jun 10 | Jul 22 | 70 (from transplant) |
| Tomatoes | Very tender | Apr 8 – May 6 | Transplant: May 27 – Jun 10 | Jul 27 | 65 (from transplant) |
| Summer squash | Tender | Apr 22 – May 6 | Direct sow (or transplant): May 13 – May 20 | Aug 11 | 50 |
| Winter squash | Very tender | May 6 – May 27 | Direct sow (or transplant): May 27 – Jun 10 | No separate fall sowing | 100 |
| Watermelon | Very tender | May 6 – May 27 | Direct sow (or transplant): May 27 – Jun 10 | No separate fall sowing | 85 |
What the Concord, New Hampshire frost-free season means for your choices
At 140 frost-free days, Concord, New Hampshire gardeners should compare that number to the days-to-harvest column before buying seed. A crop whose days to harvest plus its transplant age is close to the season length needs either an early start indoors or a short-season variety.
- Hardy crops (peas, spinach, radishes, lettuce, broccoli, cabbage) can go in from about Apr 15 – Apr 29 and again for fall.
- Very tender crops (tomatoes, peppers, eggplant, melons, winter squash) should wait until May 27 – Jun 10; start tomato seeds indoors Apr 8 – May 6.
- Fall sowing is worthwhile only for the rows that show a separate fall date; for the others the spring window already covers the season.
Concord, NH planting questions
When is the last frost in Concord, New Hampshire?
The 50% probability date for the last spring 32°F reading at CONCORD MUNICIPAL AIRPORT, NH US is May 13, from the NOAA 1991–2020 climate normals. In half the years on that record the last frost came later than that date, so tender crops are safer a week or two after it. The last 28°F hard freeze averages May 1.
When can I plant tomatoes in Concord, New Hampshire?
Tomatoes are a very tender crop, so the Colorado State Extension rule puts them out 2 or more weeks after the last spring frost: May 27 – Jun 10 in Concord, New Hampshire. Start the seeds indoors Apr 8 – May 6, which is 5 to 7 weeks before that transplant window.
How long is the growing season in Concord, New Hampshire?
Concord, New Hampshire averages 140 frost-free days, between the 50% last spring frost on May 13 and the 50% first fall frost on Sep 30 at CONCORD MUNICIPAL AIRPORT, NH US. Check a variety's days to harvest against that number before buying seed.
When should I start seeds indoors in Concord, New Hampshire?
The earliest indoor sowing on this calendar is broccoli and cabbage at Feb 25 – Mar 25. Hardy crops are transplanted out Apr 15 – Apr 29 here, and each crop's indoor window is simply its outdoor window minus the transplant age published by Colorado State Extension, so nothing starts earlier than that.
What can I plant in fall in Concord, New Hampshire?
The crops with a separate fall sowing here, latest first, are radishes, spinach, kohlrabi, turnips, lettuce (leaf) and onions (green), plus 17 more on the chart above. Each fall date counts the crop's days to harvest back from the first fall frost on Sep 30, plus an allowance for frost-tolerant crops that is our own assumption, not the source's.
Station data and limitations
| NOAA station | CONCORD MUNICIPAL AIRPORT, NH US (USW00014745) |
|---|---|
| Location | 43.12, -71.3 · elevation 105.5 m |
| Last spring 32°F / 28°F (50%) | May 13 / May 1 |
| First fall 32°F / 28°F (50%) | Sep 30 / Oct 8 |
| Dataset | NOAA/NCEI U.S. Climate Normals 1991–2020, annual/seasonal product, data types ANN-TMIN-PRBLST/PRBFST-T32FP50 and T28FP50 |
| Retrieved | 2026-10-16 |
The normals describe the airport station, not your yard. They are averages of a 30-year record and say nothing about this year's weather. Watch the local forecast around the dates shown, and use soil temperature for warm-season crops, which the Colorado State guide treats as the better signal.
Nearby calendars
- Boston, Massachusetts — last spring frost Apr 6
- Portland, Maine — last spring frost May 1
- Hartford, Connecticut — last spring frost Apr 24
- Albany, New York — last spring frost Apr 28
Read the method behind these dates: last frost date vs hardiness zone.