Monarch Mill, South Carolina, sits in USDA hardiness zone 8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Monarch Mill, 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 Monarch Mill 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 Monarch Mill — soil, climate, flood, and parcel records. How we handle your address.
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Monarch Mill — the short answer
Monarch Mill, South Carolina: USDA zone 8a, about 241 days between hard freezes, across 4K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~241
- 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 Monarch Mill's average, not your lot's — a low corner or a tree line moves it. Against Monarch Mill's 241-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Monarch Mill
Each reading below is measured for Monarch Mill itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMonarch Mill runs about 241 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
MeasuredMonarch Mill 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 Monarch Mill is in
Monarch Mill sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Monarch Mill's own centroid rather than borrowed from Union County.
What Grows in Monarch Mill
Every plant below cleared Monarch Mill's own zone 8a and its 241-day season. Each card opens that plant's South Carolina profile. How we score.
Is it too late to plant in Monarch Mill?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 15 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Monarch Mill
Survey cells within 31 miles of Monarch Mill checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 69 miles off. What to watch for.
What's on the federal record near Monarch Mill
Closest first, within ~10 miles of Monarch Mill. Listing isn't leaking, and distance isn't exposure.
- MILLIKEN MONARCHToxics Release Inventory · 0.6 mi
- LEES BODY SHOPBrownfields · 0.8 mi
- MORRIS SERVICE STATIONUnderground Storage Tanks · 0.8 mi
- CIRCLE K 2721506Underground Storage Tanks · 1.0 mi
- FAST PHILSUnderground Storage Tanks · 1.1 mi
- CRICKET 3845Underground Storage Tanks · 1.3 mi
- UNION COUNTY SCHOOLSUnderground Storage Tanks · 1.5 mi
- TRS ROOFING AND WATER PROOFINGUnderground Storage Tanks · 1.5 mi
- UNION COUNTY SCHOOL MAINTENANCEBrownfields · 1.8 mi
- SOUTHERN BELL UNINSCMAUnderground Storage Tanks · 1.8 mi
- LIL CRICKET 216Underground Storage Tanks · 1.9 mi
- CRICKET 3813Underground Storage Tanks · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Monarch Mill'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 Monarch Mill.
Total Sites
146
within ~10 miles of Monarch Mill
Risk Level
Moderate
Highest-severity
14 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Monarch Mill
Severity Distribution
within ~10 miles of Monarch Mill
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Monarch Mill, two things run higher than the national average within ~10 miles of Monarch Mill — Toxics Release Inventory (14 sites) and Underground Storage Tanks (93 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Monarch Mill
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 Monarch Mill average
Your land is one point inside Monarch Mill
Everything above resolves to Monarch Mill 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 Monarch Mill Average
Monarch Mill Average
- ●USDA Zones 8a, averaged across Monarch Mill
- ●One soil character for all of Monarch Mill
- ●Frost dates read at Monarch Mill's scale: Mar 19 to Nov 15
YOUR Parcel
- ✓Your exact zone, not Monarch Mill's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Monarch Mill
Pull a site-specific report for your exact address in Monarch Mill, South Carolina — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Monarch Mill averages can't show:
We read public map data around Monarch Mill — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Monarch Mill average
How we know this about Monarch Mill
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 Monarch Mill’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 Monarch Mill
When does frost risk typically end in Monarch Mill?
The last hard freeze (28°F) in Monarch Mill typically lands around Mar 19, 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 9.
When is the first frost in Monarch Mill?
The first hard freeze (28°F) in Monarch Mill typically arrives around Nov 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 1, so the watching starts about Oct 16 — about 241 days after the spring freeze cleared.
How long is the growing season in Monarch Mill?
Measured between 28°F hard freezes, Monarch Mill sees about 241 frost-free days — roughly Mar 19 through Nov 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Nov 1, about 206 days.
Is the soil safe to grow vegetables in Monarch Mill?
The federal record around Monarch Mill shows 146 documented sites, mostly Underground Storage Tanks entries (93), the nearest Toxics Release Inventory record about 0.6 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Monarch Mill?
From about Oct 16 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 15 (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 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Monarch Mill's scale — its 8a band and its 241-day season. Your yard writes its own version of Monarch Mill'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 Monarch Mill’s own scale
7 of the readings below were taken at Monarch Mill's own scale — its own ~241-day season between 28°F freezes, the 3,580 acres it covers and 146 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Monarch Mill's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Monarch Mill's own 28°F hard-freeze dates, about Mar 19 and Nov 15 and the ~241-day span between themNOAA 1991–2020 Climate Normals
- 146 documented contamination sites on the federal record near Monarch Mill, the closest Toxics Release Inventory record about 0.6 miles out from the town centreFederal environmental registers
- Monarch Mill's boundary and the 3,580 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~241-day seasonGrowable Ground crop-matching engine
- The ecoregion at Monarch Mill's own centroid, the PiedmontUS EPA Level III Ecoregions
- Lanternfly survey cells around Monarch Mill 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 Monarch Mill's 3,580 acres read through its county's SSURGO summaryfrom Union County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Union County
- The growing challenges every South Carolina grower plans around — written at state scale, so they stay on the state guidefrom South Carolina
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Union County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Monarch Mill's 3,580 acreswhy one lot differs from the next →
- Which side of Monarch Mill you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,580 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record about 0.6 miles 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 Monarch Mill-wide figureread your own land →