Glenn Heights, Texas, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
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 Glenn Heights, 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 Glenn Heights 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 Glenn Heights — soil, climate, flood, and parcel records. How we handle your address.
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Glenn Heights — the short answer
Glenn Heights, Texas: USDA zone 8b, about 294 days between hard freezes, across 5K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 14
- Dallas County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 5
- Dallas County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~294
- Dallas County normal — NOAA 1991–2020, nearest to this town
- City area
- 5K 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 Dallas County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Glenn Heights's average, not your lot's — a low corner or a tree line moves it. Against Glenn Heights's 294-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Glenn Heights
Each reading below is measured for Glenn Heights itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsGlenn Heights runs about 294 days between hard freezes (read from Dallas County, the closest normal to Glenn Heights) — 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
MeasuredGlenn Heights sits in USDA hardiness zone 8b.
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 Glenn Heights is in
Glenn Heights sits in the Texas Blackland Prairies — EPA Level III, inside the wider Great Plains. That is read at Glenn Heights's own centroid rather than borrowed from Dallas County.
What Grows in Glenn Heights
Every plant below cleared Glenn Heights's own zone 8b and its 294-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Glenn Heights?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Jan 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 5 — 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 Glenn Heights
Closest first, within ~10 miles of Glenn Heights. Listing isn't leaking, and distance isn't exposure.
- DALWORTH OIL CLOSEDUnderground Storage Tanks · 0.5 mi
- FAMILY DOLLAR #8354Brownfields · 0.6 mi
- M & W MARKETUnderground Storage Tanks · 0.7 mi
- MY STOPUnderground Storage Tanks · 1.3 mi
- OVILLA ROAD CITGOUnderground Storage Tanks · 1.4 mi
- BANK ONE TEXASUnderground Storage Tanks · 1.4 mi
- WALMART NEIGHBORHOOD MARKET 7232Underground Storage Tanks · 1.7 mi
- WALMART NEIGHBORHOOD MARKET #7232Brownfields · 1.7 mi
- MOTOR SERVICE AND SUPPLYBrownfields · 1.7 mi
- 223 CENTRAL OFFICE CANAL 3Underground Storage Tanks · 1.8 mi
- BEAR CREEK SHELLUnderground Storage Tanks · 1.9 mi
- K & W GROCERYUnderground Storage Tanks · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Glenn Heights'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 Glenn Heights.
Total Sites
722
within ~10 miles of Glenn Heights
Risk Level
High
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Glenn Heights
Severity Distribution
within ~10 miles of Glenn Heights
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Glenn Heights, two things run higher than the national average within ~10 miles of Glenn Heights — Toxics Release Inventory (79 sites) and PFAS (10 sites). That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Glenn Heights
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 Glenn Heights average
Your land is one point inside Glenn Heights
Everything above resolves to Glenn Heights as a whole — one PHZM band, read across 5K acres, with hard-freeze dates borrowed from Dallas 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 Glenn Heights Average
Glenn Heights Average
- ●USDA Zones 8b, averaged across Glenn Heights
- ●One soil character for all of Glenn Heights
- ●Frost dates read at Glenn Heights's scale: Feb 14 to Dec 5
YOUR Parcel
- ✓Your exact zone, not Glenn Heights's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Glenn Heights
Pull a site-specific report for your exact address in Glenn Heights, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Glenn Heights averages can't show:
We read public map data around Glenn Heights — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Glenn Heights average
How we know this about Glenn Heights
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 Dallas 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 Glenn Heights
When does frost risk typically end in Glenn Heights?
The last hard freeze (28°F) in Glenn Heights typically lands around Feb 14, 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 7.
When is the first frost in Glenn Heights?
The first hard freeze (28°F) in Glenn Heights typically arrives around Dec 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 21, so the watching starts about Nov 5 — about 294 days after the spring freeze cleared.
How long is the growing season in Glenn Heights?
Measured between 28°F hard freezes, Glenn Heights sees about 294 frost-free days — roughly Feb 14 through Dec 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 7 to Nov 21, about 259 days.
Is the soil safe to grow vegetables in Glenn Heights?
The federal record around Glenn Heights runs heavier than most — 722 documented sites, mostly Underground Storage Tanks entries (451), the nearest Underground Storage Tanks record about 0.5 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Glenn Heights?
From about Nov 5 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 Dec 5 (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 Dec 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Glenn Heights's scale — its 8b band and its 294-day season. Your yard writes its own version of Glenn Heights'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 Glenn Heights’s own scale
5 of the readings below were taken at Glenn Heights's own scale — the 4,654 acres it covers and 722 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Glenn Heights's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 722 documented contamination sites on the federal record near Glenn Heights, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Glenn Heights's boundary and the 4,654 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~294-day seasonGrowable Ground crop-matching engine
- The ecoregion at Glenn Heights's own centroid, the Texas Blackland PrairiesUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Glenn Heights has no normal of its own, so its county's is the closest measured readfrom Dallas County
- Soil character — no town-scale survey exists, so Glenn Heights's 4,654 acres read through its county's SSURGO summaryfrom Dallas County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Dallas 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 Dallas County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Glenn Heights's 4,654 acreswhy one lot differs from the next →
- Which side of Glenn Heights you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,654 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Glenn Heights-wide figureread your own land →
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