Trenton Mercer Co Airport, NJ Frost Dates & Growing Season

The two dates every Trenton Mercer Co Airport garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Apr 10
~50% chance of frost after
First fall frost
Nov 1
~50% chance of frost before
Growing season
205 days
frost-free stretch
USDA zone
≈ 7a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 30 Apr 10 Apr 25
First fall frost Nov 13 Nov 1 Oct 15
Hard freeze (28°F), median last Mar 31 · first Nov 12

Computed from NOAA 1991–2020 climate normals at the TRENTON MERCER CO AP station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Trenton Mercer Co Airport

Computed from Trenton Mercer Co Airport's own frost dates. Click any crop for the full zone-7 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 13 – Feb 27 Apr 17 – Apr 24
🫑 Peppers Jan 30 – Feb 13 Apr 24 – May 1
🥬 Lettuce Feb 27 – Mar 13 Mar 13 – Mar 27 Mar 13 – Apr 10
🫛 Peas Feb 27 – Mar 13
🥕 Carrots Mar 20 – Apr 10
🥦 Broccoli Feb 20 – Mar 6 Mar 20 – Apr 3
🥬 Kale Feb 27 – Mar 13 Mar 13 – Mar 27 Mar 13 – Mar 27
🥒 Cucumbers Mar 13 – Mar 20 Apr 17 – Apr 24 Apr 17 – Apr 24
🥒 Zucchini Mar 13 – Mar 20 Apr 17 – Apr 24 Apr 17 – Apr 24
🫘 Green Beans (Bush) Apr 17 – Apr 24
🌽 Sweet Corn Apr 17 – Apr 24
🌿 Basil Feb 27 – Mar 13 Apr 17 – Apr 24 Apr 24 – May 1
🧄 Garlic Fall: Sep 20 – Oct 18

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Trenton Mercer Co Airport's dates automatically after a lookup.

Reading the season in Trenton Mercer Co Airport

With roughly 205 frost-free days, Trenton Mercer Co Airport gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 1 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Trenton Mercer Co Airport, NJ?

The average last spring frost in Trenton Mercer Co Airport is around Apr 10, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Trenton Mercer Co Airport, NJ?

The average first fall frost in Trenton Mercer Co Airport arrives around Nov 1. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Trenton Mercer Co Airport?

About 205 frost-free days on average, from Apr 10 to Nov 1. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Trenton Mercer Co Airport in?

USDA zone 7a on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.