Last and first frost dates in Trenton

When is the last frost in Trenton?

The last frost in Trenton usually comes around 6 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 16 March, while corn waits until 14 April. The first autumn frost follows around 12 November, about 220 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 Trenton

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 8 days before the last spring frost and 15 °C 27 days after it.

Frost dates near Trenton

Of the nearest cities on our list, the last spring frost ends earliest in Dover (28 March) and latest in Allentown (15 April).

Seeds, seedlings and markets in Trenton

Within 15 km of Trenton OpenStreetMap lists 6 garden centres, 1 farm-supply shop, 3 plant nurseries, 5 markets and 3 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is Trenton Organics, 4 km away.

• Trenton Organics — garden centre
  Lamberton Road 1500, 08611 Trenton · 4 km
• Rosedale Town & Country — farm supply
  Route 31 North 101, 08534 Pennington · Mon–Fri 08:00–18:00; Sat 08:00–17:00; Sun 09:00–16:00 · 15 km
• Jacobi Provisions Center — market
  North Olden Avenue 1001, 08638 Trenton · 3 km
• McKithen Produce — farm shop
  Grant Avenue 50, 08638 Trenton · 2 km · mckitchen-produce.hub.biz
• Longford Garden Center — garden centre
  Kuser Road 947, 08619 Hamilton · 5 km
• La Stalla Italian Market — market
  North Sycamore Street 186, Newtown · Mon–Sat 09:00–19:00; Sun 09:00–18:00 · 14 km · lastallamarket.com

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

Places: © OpenStreetMap contributors, ODbL.

Weather in Trenton by month

Average weather in Trenton over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: May–September (22.3–31 °C). Months that average 30 °C or more by day: July (31 °C). Nights average below 0 °C in January (-2.7 °C), February (-1.6 °C) and December (-0.7 °C). About 1257 mm of rain falls in a year, on 131 days; July is the wettest month (135 mm) and November the driest (79 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).