Natrona Lock 4, PA Frost Dates & Growing Season

The two dates every Natrona Lock 4 garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Apr 16
~50% chance of frost after
First fall frost
Nov 2
~50% chance of frost before
Growing season
200 days
frost-free stretch
USDA zone
≈ 6b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 31 Apr 16 May 2
First fall frost Nov 16 Nov 2 Oct 20
Hard freeze (28°F), median last Apr 3 · first Nov 14

Computed from NOAA 1991–2020 climate normals at the NATRONA LOCK 4 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 Natrona Lock 4

Computed from Natrona Lock 4's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 19 – Mar 5 Apr 23 – Apr 30
🫑 Peppers Feb 5 – Feb 19 Apr 30 – May 7
🥬 Lettuce Mar 5 – Mar 19 Mar 19 – Apr 2 Mar 19 – Apr 16
🫛 Peas Mar 5 – Mar 19
🥕 Carrots Mar 26 – Apr 16
🥦 Broccoli Feb 26 – Mar 12 Mar 26 – Apr 9
🥬 Kale Mar 5 – Mar 19 Mar 19 – Apr 2 Mar 19 – Apr 2
🥒 Cucumbers Mar 19 – Mar 26 Apr 23 – Apr 30 Apr 23 – Apr 30
🥒 Zucchini Mar 19 – Mar 26 Apr 23 – Apr 30 Apr 23 – Apr 30
🫘 Green Beans (Bush) Apr 23 – Apr 30
🌽 Sweet Corn Apr 23 – Apr 30
🌿 Basil Mar 5 – Mar 19 Apr 23 – Apr 30 Apr 30 – May 7
🧄 Garlic Fall: Sep 21 – Oct 19

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 Natrona Lock 4's dates automatically after a lookup.

Reading the season in Natrona Lock 4

With roughly 200 frost-free days, Natrona Lock 4 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 2 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Natrona Lock 4, PA?

The average last spring frost in Natrona Lock 4 is around Apr 16, 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 Natrona Lock 4, PA?

The average first fall frost in Natrona Lock 4 arrives around Nov 2. 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 Natrona Lock 4?

About 200 frost-free days on average, from Apr 16 to Nov 2. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Natrona Lock 4 in?

USDA zone 6b 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.