Last and first frost dates in Concord

When is the last frost in Concord?

The last frost in Concord usually comes around 22 April: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 1 April, while corn waits until 16 May. The first autumn frost follows around 31 October, about 192 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in Concord

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 7 days after the last spring frost and 15 °C 30 days after it.

Frost dates near Concord

Of the nearest cities on our list, the last spring frost ends earliest in Boston (9 April) and latest in Montpelier (8 May).

Seeds, seedlings and markets in Concord

Within 15 km of Concord OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 6 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is Osborne's Farm and Garden Centers, 5 km away.

• Osborne's Farm and Garden Centers — garden centre
  Sheep Davis Road 258, 03301 Concord · 5 km · osbornesagway.com
• Brochu Nurseries And Landscaping — farm supply
  Commercial Street 121, 03301 · Mon–Fri 08:00–16:30 · 2 km · brochunursery.com
• Carter Hill Orchard — farm shop
  Carter Hill Road 73, 03303 Concord · 6 km · carterhillapples.com
• Johnson Golden Harvest — farm shop
  West River Road 412, 03106 Hooksett · Mon–Fri 10:00–18:00; Sat 10:00–17:00; Sun 11:00–17:00 · 15 km
• Meadow Ledge Farm — farm shop
  Route 129 612, Loudon · 15 km · meadowledgefarm.com

• Where to buy seeds and seedlings in Concord
• Selling your own harvest in the United States

Places: © OpenStreetMap contributors, ODbL.

Weather in Concord by month

Average weather in Concord over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (22.9–28.6 °C). Nights average below 0 °C in December–March (-8.1–-3.6 °C). About 1112 mm of rain falls in a year, on 127 days; July is the wettest month (110 mm) and February the driest (74 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).