Southmayd, Texas, sits in USDA hardiness zone 8a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Crops well matched to these conditions include cabbage, fig, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Southmayd, 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 Southmayd 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 Southmayd — soil, climate, flood, and parcel records. How we handle your address.
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Southmayd — the short answer
Southmayd, Texas: USDA zone 8a, about 274 days between hard freezes, across 2K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 27
- Grayson County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 28
- Grayson County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~274
- Grayson County normal — NOAA 1991–2020, nearest to this town
- City area
- 2K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Grayson County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8a is Southmayd's average, not your lot's — a low corner or a tree line moves it. Against Southmayd's 274-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Southmayd
Each reading below is measured for Southmayd itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSouthmayd runs about 274 days between hard freezes (read from Grayson County, the closest normal to Southmayd) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSouthmayd 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 Southmayd is in
Southmayd sits in the Texas Blackland Prairies — EPA Level III, inside the wider Great Plains. That is read at Southmayd's own centroid rather than borrowed from Grayson County.
What Grows in Southmayd
Every plant below cleared Southmayd's own zone 8a and its 274-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Southmayd?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 28 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Southmayd
Closest first, within ~10 miles of Southmayd. Listing isn't leaking, and distance isn't exposure.
- SHERMAN WIRE WEST PLANTToxics Release Inventory · 1800 ft
- TLT CONSTRUCTIONUnderground Storage Tanks · 2400 ft
- STOP N SHOPUnderground Storage Tanks · 0.5 mi
- GUNTER MOBILUnderground Storage Tanks · 2.0 mi
- RALPH FINKEUnderground Storage Tanks · 2.0 mi
- GRAYSON COUNTY PCT 2Underground Storage Tanks · 2.0 mi
- TXDOT MAINT FACILITYUnderground Storage Tanks · 2.0 mi
- WHITESBORO TRUCK STOPUnderground Storage Tanks · 2.0 mi
- PROCTORS MARINE REPAIR SEVUnderground Storage Tanks · 2.0 mi
- TXDOT SHERMAN MAINTENANCEUnderground Storage Tanks · 2.0 mi
- O K FEED MILLUnderground Storage Tanks · 2.0 mi
- SOUTHWESTERN BELL TELEPHONEUnderground Storage Tanks · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Southmayd'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 Southmayd.
Total Sites
342
within ~10 miles of Southmayd
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Southmayd
Severity Distribution
within ~10 miles of Southmayd
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Southmayd, two things run higher than the national average within ~10 miles of Southmayd — Underground Storage Tanks (273 sites) and Toxics Release Inventory (25 sites). That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Southmayd
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 Southmayd average
Your land is one point inside Southmayd
Everything above resolves to Southmayd as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Grayson County’s record because no 30-year normal resolves at this city’s own centroid. 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 city 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 Southmayd Average
Southmayd Average
- ●USDA Zones 8a, averaged across Southmayd
- ●One soil character for all of Southmayd
- ●Frost dates read at Southmayd's scale: Feb 27 to Nov 28
YOUR Parcel
- ✓Your exact zone, not Southmayd's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Southmayd
Pull a site-specific report for your exact address in Southmayd, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Southmayd averages can't show:
We read public map data around Southmayd — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Southmayd average
How we know this about Southmayd
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Grayson County’s record, because none resolves here; 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 city grain anywhere on this page — there is no city-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 Southmayd
When does frost risk typically end in Southmayd?
The last hard freeze (28°F) in Southmayd typically lands around Feb 27, 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 Mar 20.
When is the first frost in Southmayd?
The first hard freeze (28°F) in Southmayd typically arrives around Nov 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 14, so the watching starts about Oct 29 — about 274 days after the spring freeze cleared.
How long is the growing season in Southmayd?
Measured between 28°F hard freezes, Southmayd sees about 274 frost-free days — roughly Feb 27 through Nov 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 20 to Nov 14, about 239 days.
Is the soil safe to grow vegetables in Southmayd?
The federal record around Southmayd is a meaningful one — 342 documented sites, mostly Underground Storage Tanks entries (273), the nearest Toxics Release Inventory record about 0.3 miles 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 Southmayd?
From about Oct 29 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Southmayd's scale — its 8a band and its 274-day season. Your yard writes its own version of Southmayd'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 Southmayd’s own scale
5 of the readings below were taken at Southmayd's own scale — the 1,804 acres it covers and 342 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Southmayd's own USDA hardiness band, zones 8aUSDA PHZM 2023
- 342 documented contamination sites on the federal record near Southmayd, the closest Toxics Release Inventory record about 0.3 miles out from the town centreFederal environmental registers
- Southmayd's boundary and the 1,804 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~274-day seasonGrowable Ground crop-matching engine
- The ecoregion at Southmayd's own centroid, the Texas Blackland PrairiesUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Southmayd has no normal of its own, so its county's is the closest measured readfrom Grayson County
- Soil character — no town-scale survey exists, so Southmayd's 1,804 acres read through its county's SSURGO summaryfrom Grayson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Grayson County
- The growing challenges every Texas grower plans around — written at state scale, so they stay on the state guidefrom Texas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Grayson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Southmayd's 1,804 acreswhy one lot differs from the next →
- Which side of Southmayd you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,804 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record about 0.3 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 Southmayd-wide figureread your own land →
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