Coryell County, in Texas, sits in USDA hardiness zone 8b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Well-matched crops include cabbage, fig, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Coryell County holds more than one microclimate.
Soils and elevations shift across Coryell County, so your frost dates and drainage aren't the county average. 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 Coryell County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Coryell County — the short answer
Coryell County, Texas: USDA zone 8b, about 287 days between hard freezes, across 673K acres.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 17
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Dec 1
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~287
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 673K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 8b is Coryell County's average, not your lot's — a low corner or a tree line moves it. Against Coryell County's 287-day season, see what your own ground reads.
Heat and winter chill in Coryell County
Across a year, Coryell County accumulates about 6,156 growing degree days above 50°F, about 332 more than the middle Texas county — ahead of 166 of Texas’s 254 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Winter banks about 817 hours below 45°F, 278 fewer than the Texas middle of 1,095. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Coryell County
Across Coryell County, the ground is predominantly Mollisols, where Real, Nuff, and Eckrant are the most extensive named soil series. The soil is generally well drained with a clay loam surface. Topsoil pH runs about 7.9–8.2, moderately alkaline. Rainfall drains through hydrologic group D soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
19%
Hydric soils
0%
Soil still varies lot by lot — soil types explained.
How the ground varies across Coryell County
The USDA soil survey maps 94% of Coryell County as well drained — but another 6% drains differently: 6% moderately well drained.
Real is the most extensive named soil at 12% of mapped acres, then Nuff (12%) and Eckrant (10%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Coryell County
Each reading below is measured for Coryell County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Coryell County are well drained, in hydrologic group D — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Coryell County runs about pH 7.9–8.2, on the alkaline side.
Many vegetables cope, but acid-lovers like blueberries struggle, and iron and manganese lock up above about pH 7.5 — leaves yellow between the veins even in rich soil.
Elemental sulfur and generous organic matter lower pH slowly for the beds that need it; test first so you add only what the soil actually calls for.
USDA NRCS SSURGO
Season length
MeasuredCoryell County runs about 287 days between hard freezes — 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
MeasuredCoryell County 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 Coryell County is in
Coryell County sits in the Cross Timbers — EPA Level III, inside the wider Great Plains. One consistent ecological setting across the whole county.
What Grows in Coryell County
We scored all 1,086 plants against Coryell County's own USDA zone 8b and its own 287-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Texas profile.
Is it too late to plant in Coryell County?
Almost never — the real question is what to plant next. 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 Dec 1 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
Documented around Coryell County
- monarch butterfly2 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Coryell County
USGS estimates 28,944 lb of 2,4-d on Coryell County farmland in 2019, its largest by weight, ahead of Glyphosate (16,168 lb) and Acephate (6,952 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Coryell County — and how to grow with it.
We checked the federal record across Coryell County — 154 documented sites across 5 of the 9 source types we track.
The most significant on record: 1 Superfund site (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Coryell County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Coryell County
Closest first, across Coryell County. Listing isn't leaking, and distance isn't exposure.
- COUNTRY CORNERUnderground Storage Tanks · 400 ft
- HATTAWAYSUnderground Storage Tanks · 400 ft
- COUNTY OF CORYELLUnderground Storage Tanks · 400 ft
- DEANS STORE & STATIONUnderground Storage Tanks · 400 ft
- CARPET CENTERUnderground Storage Tanks · 400 ft
- OUR PLACEUnderground Storage Tanks · 400 ft
- COCA COLA BOTTLING WHSEUnderground Storage Tanks · 400 ft
- FORT GATES GULFUnderground Storage Tanks · 400 ft
- WATSON TEXACOUnderground Storage Tanks · 400 ft
- DR PEPPER BOTTLINGUnderground Storage Tanks · 400 ft
- MTM GEN STOREUnderground Storage Tanks · 400 ft
- BLAKLEY GROCERYUnderground Storage Tanks · 400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Coryell County'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 Coryell County.
Total Sites
154
across Coryell County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Coryell County
Severity Distribution
across Coryell County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Coryell County, two things run higher than the national average across Coryell County — PFAS (4 sites) and Underground Storage Tanks (130 sites). That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Coryell County
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 Coryell County average
Your land is one point inside Coryell County
Everything above resolves to Coryell County as a whole — one PHZM band and one county frost record, read across 673K 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 county 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 county average.
Your Lot vs the Coryell County Average
Coryell County Average
- ●USDA Zones 8b, averaged across Coryell County
- ●One soil character for all of Coryell County
- ●Frost dates read at Coryell County's scale: Feb 17 to Dec 1
YOUR Parcel
- ✓Your exact zone, not Coryell County's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Coryell County
Pull a site-specific report for your exact address in Coryell County, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Coryell County averages can't show:
We read public map data around Coryell County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Coryell County average
How we know this about Coryell County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Coryell County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Coryell County
When does frost risk typically end in Coryell County?
The last hard freeze (28°F) in Coryell County 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.
How long is the growing season in Coryell County?
Measured between 28°F hard freezes, Coryell County sees about 287 frost-free days — roughly Feb 17 through Dec 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 10 to Nov 17, about 252 days.
Is the soil safe to grow vegetables in Coryell County?
The federal record around Coryell County is a meaningful one — 154 documented sites, mostly Underground Storage Tanks entries (130), 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.
Everything above is measured at Coryell County's scale — its 8b band and its 287-day season. Your yard writes its own version of Coryell County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Texas's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Coryell County’s own scale
9 of the readings below were taken at Coryell County's own scale — its own ~287-day span between 28°F freezes, the 3 most extensive soil series mapped here and 154 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Coryell County's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Coryell County's own 28°F hard-freeze dates and its ~287-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Coryell CountyUSDA NRCS SSURGO
- 154 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record under a tenth of a mile outFederal environmental registers
- Coryell County's boundary and the 673,438 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~287-day seasonGrowable Ground crop-matching engine
- Coryell County sitting wholly inside the Cross TimbersUS EPA Level III Ecoregions
- Open occurrence records documented in Coryell County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Coryell County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Texas grower plans around — written at state scale, so they stay on the state guidefrom Texas
What this page can’t tell you
- How the season shifts across Coryell County — the ~287 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Coryell County's 673,438 acreswhy one lot differs from the next →
- Which of those 154 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Coryell Countyread your own land →