Chapel Hill Williams Airport, NC Frost Dates & Growing Season

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

Last spring frost
Mar 29
~50% chance of frost after
First fall frost
Nov 5
~50% chance of frost before
Growing season
221 days
frost-free stretch
USDA zone
≈ 8a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 11 Mar 29 Apr 12
First fall frost Nov 21 Nov 5 Oct 23
Hard freeze (28°F), median last Mar 15 · first Nov 17

Computed from NOAA 1991–2020 climate normals at the CHAPEL HILL WILLIAMS 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 Chapel Hill Williams Airport

Computed from Chapel Hill Williams Airport's own frost dates. Click any crop for the full zone-8 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 1 – Feb 15 Apr 5 – Apr 12
🫑 Peppers Jan 18 – Feb 1 Apr 12 – Apr 19
🥬 Lettuce Feb 15 – Mar 1 Mar 1 – Mar 15 Mar 1 – Mar 29
🫛 Peas Feb 15 – Mar 1
🥕 Carrots Mar 8 – Mar 29
🥦 Broccoli Feb 8 – Feb 22 Mar 8 – Mar 22
🥬 Kale Feb 15 – Mar 1 Mar 1 – Mar 15 Mar 1 – Mar 15
🥒 Cucumbers Mar 1 – Mar 8 Apr 5 – Apr 12 Apr 5 – Apr 12
🥒 Zucchini Mar 1 – Mar 8 Apr 5 – Apr 12 Apr 5 – Apr 12
🫘 Green Beans (Bush) Apr 5 – Apr 12
🌽 Sweet Corn Apr 5 – Apr 12
🌿 Basil Feb 15 – Mar 1 Apr 5 – Apr 12 Apr 12 – Apr 19
🧄 Garlic Fall: Sep 24 – Oct 22

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 Chapel Hill Williams Airport's dates automatically after a lookup.

Reading the season in Chapel Hill Williams Airport

With roughly 221 frost-free days, Chapel Hill Williams 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 5 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Chapel Hill Williams Airport, NC?

The average last spring frost in Chapel Hill Williams Airport is around Mar 29, 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 Chapel Hill Williams Airport, NC?

The average first fall frost in Chapel Hill Williams Airport arrives around Nov 5. 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 Chapel Hill Williams Airport?

About 221 frost-free days on average, from Mar 29 to Nov 5. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Chapel Hill Williams Airport in?

USDA zone 8a 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.