Hewitt, 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.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Hewitt, 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 Hewitt 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 Hewitt — soil, climate, flood, and parcel records. How we handle your address.
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Hewitt — the short answer
Hewitt, Texas: USDA zone 8b, about 286 days between hard freezes, across 4K acres of city.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 18
- McLennan County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 1
- McLennan County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~286
- McLennan County normal — NOAA 1991–2020, nearest to this town
- City area
- 4K 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 McLennan County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Hewitt's average, not your lot's — a low corner or a tree line moves it. Against Hewitt's 286-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hewitt
Each reading below is measured for Hewitt itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsHewitt runs about 286 days between hard freezes (read from McLennan County, the closest normal to Hewitt) — 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
MeasuredHewitt 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 Hewitt is in
Hewitt sits in the Texas Blackland Prairies — EPA Level III, inside the wider Great Plains. That is read at Hewitt's own centroid rather than borrowed from McLennan County.
What Grows in Hewitt
Every plant below cleared Hewitt's own zone 8b and its 286-day season. Each card opens that plant's Texas profile. How we score.
Is it too late to plant in Hewitt?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Jan 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 18 (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. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Hewitt
Closest first, within ~10 miles of Hewitt. Listing isn't leaking, and distance isn't exposure.
- CITY OF HEWITTPFAS · 1500 ft
- ISLAMIC CENTER OF HEWITTUnderground Storage Tanks · 0.7 mi
- SOUTHERN ENTERPRISES OF ENVIROCAREBrownfields · 0.8 mi
- MIDWAY TRANSPORTATIONUnderground Storage Tanks · 0.9 mi
- 7-ELEVEN STORE 40554Underground Storage Tanks · 1.0 mi
- CEFCO 100Underground Storage Tanks · 1.0 mi
- KENT KWIK 614Underground Storage Tanks · 1.0 mi
- 7 ELEVEN 20150Underground Storage Tanks · 1.1 mi
- DAVIS IRON WORKS OPERATIONSBrownfields · 1.1 mi
- CORNER STORE 1328Underground Storage Tanks · 1.2 mi
- DAVIS IRON WORKSUnderground Storage Tanks · 1.2 mi
- WALMART SUPERCENTER #7156Brownfields · 1.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hewitt'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 Hewitt.
Total Sites
719
within ~10 miles of Hewitt
Risk Level
Elevated
Highest-severity
51 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Hewitt
Severity Distribution
within ~10 miles of Hewitt
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hewitt, two things run higher than the national average within ~10 miles of Hewitt — Underground Storage Tanks (548 sites) and Toxics Release Inventory (51 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Hewitt
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 Hewitt average
Your land is one point inside Hewitt
Everything above resolves to Hewitt as a whole — one PHZM band, read across 4K acres, with hard-freeze dates borrowed from McLennan 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 Hewitt Average
Hewitt Average
- ●USDA Zones 8b, averaged across Hewitt
- ●One soil character for all of Hewitt
- ●Frost dates read at Hewitt's scale: Feb 18 to Dec 1
YOUR Parcel
- ✓Your exact zone, not Hewitt's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hewitt
Pull a site-specific report for your exact address in Hewitt, Texas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hewitt averages can't show:
We read public map data around Hewitt — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hewitt average
How we know this about Hewitt
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 McLennan 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 Hewitt
When does frost risk typically end in Hewitt?
The last hard freeze (28°F) in Hewitt typically lands around Feb 18, 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 11.
When is the first frost in Hewitt?
The first hard freeze (28°F) in Hewitt typically arrives around Dec 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 17, so the watching starts about Nov 1 — about 286 days after the spring freeze cleared.
How long is the growing season in Hewitt?
Measured between 28°F hard freezes, Hewitt sees about 286 frost-free days — roughly Feb 18 through Dec 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 11 to Nov 17, about 251 days.
Is the soil safe to grow vegetables in Hewitt?
The federal record around Hewitt is a meaningful one — 719 documented sites, mostly Underground Storage Tanks entries (548), the nearest PFAS 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 Hewitt?
From about Nov 1 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hewitt's scale — its 8b band and its 286-day season. Your yard writes its own version of Hewitt'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 Hewitt’s own scale
5 of the readings below were taken at Hewitt's own scale — the 4,408 acres it covers and 719 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Hewitt's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 719 documented contamination sites on the federal record near Hewitt, the closest PFAS record about 0.3 miles out from the town centreFederal environmental registers
- Hewitt's boundary and the 4,408 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~286-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hewitt's own centroid, the Texas Blackland PrairiesUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Hewitt has no normal of its own, so its county's is the closest measured readfrom McLennan County
- Soil character — no town-scale survey exists, so Hewitt's 4,408 acres read through its county's SSURGO summaryfrom McLennan County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom McLennan 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 McLennan County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hewitt's 4,408 acreswhy one lot differs from the next →
- Which side of Hewitt you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,408 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest PFAS 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 Hewitt-wide figureread your own land →
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