Philadelphia NE Airport, PA Frost Dates & Growing Season

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

Last spring frost
Apr 4
~50% chance of frost after
First fall frost
Nov 7
~50% chance of frost before
Growing season
217 days
frost-free stretch
USDA zone
≈ 7b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 21 Apr 4 Apr 17
First fall frost Nov 22 Nov 7 Oct 24
Hard freeze (28°F), median last Mar 23 · first Nov 19

Computed from NOAA 1991–2020 climate normals at the PHILADELPHIA NE 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 Philadelphia NE Airport

Computed from Philadelphia NE 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 7 – Feb 21 Apr 11 – Apr 18
🫑 Peppers Jan 24 – Feb 7 Apr 18 – Apr 25
🥬 Lettuce Feb 21 – Mar 7 Mar 7 – Mar 21 Mar 7 – Apr 4
🫛 Peas Feb 21 – Mar 7
🥕 Carrots Mar 14 – Apr 4
🥦 Broccoli Feb 14 – Feb 28 Mar 14 – Mar 28
🥬 Kale Feb 21 – Mar 7 Mar 7 – Mar 21 Mar 7 – Mar 21
🥒 Cucumbers Mar 7 – Mar 14 Apr 11 – Apr 18 Apr 11 – Apr 18
🥒 Zucchini Mar 7 – Mar 14 Apr 11 – Apr 18 Apr 11 – Apr 18
🫘 Green Beans (Bush) Apr 11 – Apr 18
🌽 Sweet Corn Apr 11 – Apr 18
🌿 Basil Feb 21 – Mar 7 Apr 11 – Apr 18 Apr 18 – Apr 25
🧄 Garlic Fall: Sep 26 – Oct 24

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 Philadelphia NE Airport's dates automatically after a lookup.

Reading the season in Philadelphia NE Airport

With roughly 217 frost-free days, Philadelphia NE 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 7 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Philadelphia NE Airport, PA?

The average last spring frost in Philadelphia NE Airport is around Apr 4, 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 Philadelphia NE Airport, PA?

The average first fall frost in Philadelphia NE Airport arrives around Nov 7. 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 Philadelphia NE Airport?

About 217 frost-free days on average, from Apr 4 to Nov 7. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Philadelphia NE Airport in?

USDA zone 7b 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.