Rockwall, Texas, sits in USDA hardiness zone 8b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Rockwall, 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 Rockwall 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 Rockwall — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Rockwall — the short answer
Rockwall, Texas: USDA zone 8b, about 285 days between hard freezes, across 19K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 17
- Rockwall County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 29
- Rockwall County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~285
- Rockwall County normal — NOAA 1991–2020, nearest to this town
- City area
- 19K 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 Rockwall County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Rockwall's average, not your lot's — a low corner or a tree line moves it. Against Rockwall's 285-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rockwall
Each reading below is measured for Rockwall itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsRockwall runs about 285 days between hard freezes (read from Rockwall County, the closest normal to Rockwall) — 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
MeasuredRockwall 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 Rockwall is in
Rockwall sits in the Texas Blackland Prairies — EPA Level III, inside the wider Great Plains. That is read at Rockwall's own centroid rather than borrowed from Rockwall County.
What Grows in Rockwall
Every plant below cleared Rockwall's own zone 8b and its 285-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Rockwall?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 29 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Rockwall
Closest first, within ~10 miles of Rockwall. Listing isn't leaking, and distance isn't exposure.
- TRINITY MATERIALSUnderground Storage Tanks · 1400 ft
- CHANNELL ROCKWALL TEXASToxics Release Inventory · 1500 ft
- CHANNELL ROCKWALL TEXASBrownfields · 1500 ft
- FLOOR N TILE SOLUTIONSUnderground Storage Tanks · 1500 ft
- LONE STAR CIRCUITS INCToxics Release Inventory · 2200 ft
- ROCKWALL PLANTToxics Release Inventory · 2400 ft
- PLANT 2Underground Storage Tanks · 2400 ft
- MOORE INDUSTRIAL DISPOSALUnderground Storage Tanks · 2400 ft
- CITY OF ROCKWALL SERVICE CENTERUnderground Storage Tanks · 0.5 mi
- RALPH HALL MUNICIPAL AIRPORTUnderground Storage Tanks · 0.6 mi
- CRASH CHAMPIONS LLCBrownfields · 0.6 mi
- CHRYSO INCToxics Release Inventory · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rockwall'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 Rockwall.
Total Sites
307
within ~10 miles of Rockwall
Risk Level
High
Highest-severity
5 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Rockwall
Severity Distribution
within ~10 miles of Rockwall
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rockwall, two things run higher than the national average within ~10 miles of Rockwall — PFAS (14 sites) and Toxics Release Inventory (36 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Rockwall
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 Rockwall average
Your land is one point inside Rockwall
Everything above resolves to Rockwall as a whole — one PHZM band, read across 19K acres, with hard-freeze dates borrowed from Rockwall 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 Rockwall Average
Rockwall Average
- ●USDA Zones 8b, averaged across Rockwall
- ●One soil character for all of Rockwall
- ●Frost dates read at Rockwall's scale: Feb 17 to Nov 29
YOUR Parcel
- ✓Your exact zone, not Rockwall's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rockwall
Pull a site-specific report for your exact address in Rockwall, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rockwall averages can't show:
We read public map data around Rockwall — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rockwall average
How we know this about Rockwall
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 Rockwall 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 Rockwall
When does frost risk typically end in Rockwall?
The last hard freeze (28°F) in Rockwall typically lands around Feb 17, 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 10.
When is the first frost in Rockwall?
The first hard freeze (28°F) in Rockwall typically arrives around Nov 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 15, so the watching starts about Oct 30 — about 285 days after the spring freeze cleared.
How long is the growing season in Rockwall?
Measured between 28°F hard freezes, Rockwall sees about 285 frost-free days — roughly Feb 17 through Nov 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 10 to Nov 15, about 250 days.
Is the soil safe to grow vegetables in Rockwall?
The federal record around Rockwall runs heavier than most — 307 documented sites, mostly Underground Storage Tanks entries (187), the nearest Underground Storage Tanks record about 0.3 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 Rockwall?
From about Oct 30 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rockwall's scale — its 8b band and its 285-day season. Your yard writes its own version of Rockwall'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 Rockwall’s own scale
5 of the readings below were taken at Rockwall's own scale — the 18,936 acres it covers and 307 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Rockwall's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 307 documented contamination sites on the federal record near Rockwall, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Rockwall's boundary and the 18,936 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~285-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rockwall's own centroid, the Texas Blackland PrairiesUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Rockwall has no normal of its own, so its county's is the closest measured readfrom Rockwall County
- Soil character — no town-scale survey exists, so Rockwall's 18,936 acres read through its county's SSURGO summaryfrom Rockwall County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Rockwall 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 Rockwall County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rockwall's 18,936 acreswhy one lot differs from the next →
- Which side of Rockwall you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 18,936 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Rockwall-wide figureread your own land →
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