Siler City, North Carolina, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Expect cabbage, fig, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Siler City, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Siler City lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Siler City — soil, climate, flood, and parcel records. How we handle your address.
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Siler City — the short answer
Siler City, North Carolina: USDA zone 8a, about 243 days between hard freezes, across 4K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~243
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 8a is Siler City's average, not your lot's — a low corner or a tree line moves it. Against Siler City's 243-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Siler City
Each reading below is measured for Siler City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSiler City runs about 243 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSiler City sits in USDA hardiness zone 8a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Siler City is in
Siler City sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Siler City's own centroid rather than borrowed from Chatham County.
What Grows in Siler City
Every plant below cleared Siler City's own zone 8a and its 243-day season. Each card opens that plant's North Carolina profile. How we score.
Is it too late to plant in Siler City?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 16 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Siler City
Survey cells within 31 miles of Siler City checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 34 miles off. What to watch for.
What's on the federal record near Siler City
Closest first, within ~10 miles of Siler City. Listing isn't leaking, and distance isn't exposure.
- AMERICAN SERVICE CENTERUnderground Storage Tanks · 450 ft
- CHATHAM OIL CO INCUnderground Storage Tanks · 600 ft
- CITY HALLUnderground Storage Tanks · 650 ft
- DESPERADOS WESTERN MARTUnderground Storage Tanks · 650 ft
- S&H OILUnderground Storage Tanks · 650 ft
- SMITH & BUCKNER FUNERAL HOME,INCUnderground Storage Tanks · 750 ft
- CHATHAM CAR CAREUnderground Storage Tanks · 750 ft
- THE BOLING CO.Underground Storage Tanks · 900 ft
- BOLING COToxics Release Inventory · 900 ft
- BILL & BILL SERVICE STATIONUnderground Storage Tanks · 1000 ft
- HADLEY-PEOPLES MFG COMPANYUnderground Storage Tanks · 1000 ft
- NCDSCA DC190002( CHATHAM CLEANERS AND LAUNDRETTE )Brownfields · 1200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Siler City's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Siler City.
Total Sites
130
within ~10 miles of Siler City
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Siler City
Severity Distribution
within ~10 miles of Siler City
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Siler City, two things run higher than the national average within ~10 miles of Siler City — Toxics Release Inventory (15 sites) and Underground Storage Tanks (91 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Siler City
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Siler City average
Your land is one point inside Siler City
Everything above resolves to Siler City as a whole — one PHZM band and one 28°F frost record, read across 4K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Siler City Average
Siler City Average
- ●USDA Zones 8a, averaged across Siler City
- ●One soil character for all of Siler City
- ●Frost dates read at Siler City's scale: Mar 18 to Nov 16
YOUR Parcel
- ✓Your exact zone, not Siler City's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Siler City
Pull a site-specific report for your exact address in Siler City, North Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Siler City averages can't show:
We read public map data around Siler City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Siler City average
How we know this about Siler City
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Siler City’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Siler City
When does frost risk typically end in Siler City?
The last hard freeze (28°F) in Siler City typically lands around Mar 18, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 8.
When is the first frost in Siler City?
The first hard freeze (28°F) in Siler City typically arrives around Nov 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 2, so the watching starts about Oct 17 — about 243 days after the spring freeze cleared.
How long is the growing season in Siler City?
Measured between 28°F hard freezes, Siler City sees about 243 frost-free days — roughly Mar 18 through Nov 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 8 to Nov 2, about 208 days.
Is the soil safe to grow vegetables in Siler City?
The federal record around Siler City is a meaningful one — 130 documented sites, mostly Underground Storage Tanks entries (91), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Siler City?
From about Oct 17 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 16 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Siler City's scale — its 8a band and its 243-day season. Your yard writes its own version of Siler City's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Siler City’s own scale
7 of the readings below were taken at Siler City's own scale — its own ~243-day season between 28°F freezes, the 4,317 acres it covers and 130 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Siler City's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Siler City's own 28°F hard-freeze dates, about Mar 18 and Nov 16 and the ~243-day span between themNOAA 1991–2020 Climate Normals
- 130 documented contamination sites on the federal record near Siler City, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Siler City's boundary and the 4,317 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~243-day seasonGrowable Ground crop-matching engine
- The ecoregion at Siler City's own centroid, the PiedmontUS EPA Level III Ecoregions
- Lanternfly survey cells around Siler City checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Siler City's 4,317 acres read through its county's SSURGO summaryfrom Chatham County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Chatham County
- The growing challenges every North Carolina grower plans around — written at state scale, so they stay on the state guidefrom North Carolina
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Chatham County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Siler City's 4,317 acreswhy one lot differs from the next →
- Which side of Siler City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,317 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Siler City-wide figureread your own land →
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