Willow Grove NAS, PA Frost Dates & Growing Season

The two dates every Willow Grove NAS garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Apr 11
~50% chance of frost after
First fall frost
Nov 1
~50% chance of frost before
Growing season
204 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 29 Apr 11 Apr 27
First fall frost Nov 17 Nov 1 Oct 17
Hard freeze (28°F), median last Mar 30 · first Nov 13

Computed from NOAA 1991–2020 climate normals at the WILLOW GROVE NAS 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 Willow Grove NAS

Computed from Willow Grove NAS'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 14 – Feb 28 Apr 18 – Apr 25
🫑 Peppers Jan 31 – Feb 14 Apr 25 – May 2
🥬 Lettuce Feb 28 – Mar 14 Mar 14 – Mar 28 Mar 14 – Apr 11
🫛 Peas Feb 28 – Mar 14
🥕 Carrots Mar 21 – Apr 11
🥦 Broccoli Feb 21 – Mar 7 Mar 21 – Apr 4
🥬 Kale Feb 28 – Mar 14 Mar 14 – Mar 28 Mar 14 – Mar 28
🥒 Cucumbers Mar 14 – Mar 21 Apr 18 – Apr 25 Apr 18 – Apr 25
🥒 Zucchini Mar 14 – Mar 21 Apr 18 – Apr 25 Apr 18 – Apr 25
🫘 Green Beans (Bush) Apr 18 – Apr 25
🌽 Sweet Corn Apr 18 – Apr 25
🌿 Basil Feb 28 – Mar 14 Apr 18 – Apr 25 Apr 25 – May 2
🧄 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 Willow Grove NAS's dates automatically after a lookup.

Reading the season in Willow Grove NAS

With roughly 204 frost-free days, Willow Grove NAS 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 Willow Grove NAS, PA?

The average last spring frost in Willow Grove NAS is around Apr 11, 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 Willow Grove NAS, PA?

The average first fall frost in Willow Grove NAS 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 Willow Grove NAS?

About 204 frost-free days on average, from Apr 11 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 Willow Grove NAS 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.