Conditional — Some Areas
leek (zones 2-11) has limited zone overlap with North Carolina (5b-8b). Only zones 5-8 in the state are suitable.
Your yard isn't the whole zone.
North Carolina spans zones 5b-8b, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score leek against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Leek Needs
- USDA Zones: 2-11
- Soil pH: 4.5 - 7.5
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 120+
North Carolina Has
- USDA Zones: 5b-8b
- Last Frost: Mar 10 - May 5
- First Frost: Oct 5 - Nov 15
- Annual Rainfall: 40-60 inches
- Common Soils: Red clay (Piedmont), Sandy loam (Coastal), Mountain loam
Plant Zone Range (zones 2-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Leek in North Carolina
The frost window
Across North Carolina, the last spring frost clears between Mar 10 and May 5, and the first fall frost lands between Oct 5 and Nov 15 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 153-day window you can count on — up to 250 days on a mild site in a kind year.
Frost tenderness
Leek is frost-tender — its listed minimum temperature is 42.8°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Establishment timing
As a long-lived plant, leek isn't racing the calendar to a harvest date. Plant it in spring once the last-frost window passes so roots settle in through the full season, or in early fall while the soil still holds summer warmth.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Leek wants 120+ frost-free days; a typical North Carolina site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Leek needs ~1500 GDD (base 50°F) to ripen. The state median runs ~4200 GDD (USDA NRCS county aggregates), so North Carolina's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Leek likes near-neutral soil (pH 4.5-7.5). That's the common-ground band across North Carolina's red clay (piedmont) and sandy loam (coastal) — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your North Carolina site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. North Carolina soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Leek in North Carolina — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 2-11 (USDA PLANTS Database)
- State Zones: 5b-8b (USDA ARS PHZM 2023)
- Growing Season: Mar 10 - May 5 to Oct 5 - Nov 15 (NOAA Climate Normals)
- Days to Maturity: 100 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but North Carolina growers also need to think about:
Red Piedmont clay is hard to work and drains poorly
Red clay rewards patience — compost opens it over seasons, and a raised bed gets you harvesting in the meantime.
Humidity drives significant disease pressure
Airflow, morning base-watering, and resistant varieties — the humid-South trio your extension's lists are built around.
Hurricane risk on the coastal plain
On the coastal plain, favor wind-tough perennials and stake young trees well ahead of storm season.
Pollinator + Wildlife Value
Leek draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
North Carolina Cooperative Extension
For North Carolina-specific cultivar recommendations, planting calendars, and pest pressure for leek, the canonical source is NC State Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Leek native to North Carolina?
No — the USDA PLANTS Database lists Leek as introduced rather than native in the Lower 48, so it is not part of North Carolina's native flora. It grows here as a garden plant; pairing it with a few North Carolina natives keeps local pollinators fed too.
Looking for plants that belong here? The North Carolina growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Leek in North Carolina
When can I plant Leek in North Carolina?
North Carolina's last spring frost clears between Mar 10 and May 5, and the first fall frost lands between Oct 5 and Nov 15 (NOAA Climate Normals 1991-2020). Leek is a long-lived planting, so target spring just after your local last frost — or early fall while the soil holds warmth — and let it establish through the season.
What hardiness zone is Leek grown in across North Carolina?
North Carolina spans USDA hardiness zones 5b-8b (USDA ARS PHZM 2023). Leek carries a range of zones 2-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical North Carolina site have?
A typical North Carolina site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Leek needs 120+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Leek native to North Carolina?
No — the USDA PLANTS Database lists Leek as introduced rather than native in the Lower 48, so it is not part of North Carolina's native flora. It grows here as a garden plant; pairing it with a few North Carolina natives keeps local pollinators fed too.
How should I amend the soil for Leek in North Carolina?
Leek prefers pH 4.5-7.5 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across North Carolina soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Leek actually grow on my specific land in North Carolina?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores leek against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in North Carolina
State-level data is a sketch. Your Growable Ground report scores leek against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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