Hazelwood, Missouri, sits in USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Hazelwood, 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 Hazelwood 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 Hazelwood — soil, climate, flood, and parcel records. How we handle your address.
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Hazelwood — the short answer
Hazelwood, Missouri: USDA zone 6b, about 233 days between hard freezes, across 10K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~233
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 10K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 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 6b is Hazelwood's average, not your lot's — a low corner or a tree line moves it. Against Hazelwood's 233-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hazelwood
Each reading below is measured for Hazelwood itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHazelwood runs about 233 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHazelwood sits in USDA hardiness zone 6b.
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 Hazelwood is in
Hazelwood sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hazelwood's own centroid rather than borrowed from St. Louis County.
What Grows in Hazelwood
Every plant below cleared Hazelwood's own zone 6b and its 233-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Hazelwood?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 12 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Hazelwood
Survey cells within 31 miles of Hazelwood checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 236 miles off. What to watch for.
What's on the federal record near Hazelwood
Closest first, within ~10 miles of Hazelwood. Listing isn't leaking, and distance isn't exposure.
- RYDER BJC WAREHOUSEBrownfields · 1100 ft
- AT&TUnderground Storage Tanks · 0.6 mi
- CALIBER COLLISION CENTER ST LOUIS NON DRIVE 2574Brownfields · 0.7 mi
- COMPOSITES ONE LLCBrownfields · 0.7 mi
- POTTER ELECTRIC SIGNAL COMPANY LLCBrownfields · 0.8 mi
- 4849 PARK 370 C O E L HOLLINGSWORTHUnderground Storage Tanks · 0.9 mi
- PENSKE TRUCK LEASING CO LPBrownfields · 0.9 mi
- QUIKTRIP #615RUnderground Storage Tanks · 1.0 mi
- QUIKTRIP STORE #615Brownfields · 1.0 mi
- QUIKTRIP #615Underground Storage Tanks · 1.0 mi
- HOWDERSHELL CITGOUnderground Storage Tanks · 1.0 mi
- DEGEL TRUCK CENTERBrownfields · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hazelwood'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 Hazelwood.
Sources Checked
within ~10 miles of Hazelwood
Severity Distribution
within ~10 miles of Hazelwood
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hazelwood, Toxics Release Inventory runs higher than the national average — 147 sites within ~10 miles of Hazelwood. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Hazelwood
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 Hazelwood average
Your land is one point inside Hazelwood
Everything above resolves to Hazelwood as a whole — one PHZM band and one 28°F frost record, read across 10K 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 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 Hazelwood Average
Hazelwood Average
- ●USDA Zones 6b, averaged across Hazelwood
- ●One soil character for all of Hazelwood
- ●Frost dates read at Hazelwood's scale: Mar 24 to Nov 12
YOUR Parcel
- ✓Your exact zone, not Hazelwood's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hazelwood
Pull a site-specific report for your exact address in Hazelwood, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hazelwood averages can't show:
We read public map data around Hazelwood — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hazelwood average
How we know this about Hazelwood
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 Hazelwood’s own record; 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 Hazelwood
When does frost risk typically end in Hazelwood?
The last hard freeze (28°F) in Hazelwood typically lands around Mar 24, 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 Apr 14.
When is the first frost in Hazelwood?
The first hard freeze (28°F) in Hazelwood typically arrives around Nov 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 29, so the watching starts about Oct 13 — about 233 days after the spring freeze cleared.
How long is the growing season in Hazelwood?
Measured between 28°F hard freezes, Hazelwood sees about 233 frost-free days — roughly Mar 24 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 14 to Oct 29, about 198 days.
Is the soil safe to grow vegetables in Hazelwood?
The federal record around Hazelwood is a meaningful one — 2,153 documented sites, mostly Underground Storage Tanks entries (1,221), the nearest Brownfields record about 0.2 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 Hazelwood?
From about Oct 13 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 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hazelwood's scale — its 6b band and its 233-day season. Your yard writes its own version of Hazelwood'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 Hazelwood’s own scale
7 of the readings below were taken at Hazelwood's own scale — its own ~233-day season between 28°F freezes, the 10,264 acres it covers and 2,153 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hazelwood's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Hazelwood's own 28°F hard-freeze dates, about Mar 24 and Nov 12 and the ~233-day span between themNOAA 1991–2020 Climate Normals
- 2,153 documented contamination sites on the federal record near Hazelwood, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Hazelwood's boundary and the 10,264 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~233-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hazelwood's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Hazelwood checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hazelwood's 10,264 acres read through its county's SSURGO summaryfrom St. Louis County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom St. Louis County
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom St. Louis County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hazelwood's 10,264 acreswhy one lot differs from the next →
- Which side of Hazelwood you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,264 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Hazelwood-wide figureread your own land →
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