Dellwood, Missouri, sits in USDA hardiness zone 7a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, hazelnut, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Dellwood, 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 Dellwood 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 Dellwood — soil, climate, flood, and parcel records. How we handle your address.
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Dellwood — the short answer
Dellwood, Missouri: USDA zone 7a, about 246 days between hard freezes, across 664 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~246
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 664 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 7a is Dellwood's average, not your lot's — a low corner or a tree line moves it. Against Dellwood's 246-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dellwood
Each reading below is measured for Dellwood itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDellwood runs about 246 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
MeasuredDellwood sits in USDA hardiness zone 7a.
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 Dellwood is in
Dellwood sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dellwood's own centroid rather than borrowed from St. Louis County.
What Grows in Dellwood
Every plant below cleared Dellwood's own zone 7a and its 246-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Dellwood?
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 Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Dellwood
Survey cells within 31 miles of Dellwood checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 235 miles off. What to watch for.
What's on the federal record near Dellwood
Closest first, within ~10 miles of Dellwood. Listing isn't leaking, and distance isn't exposure.
- WEST FLORISSANT CONOCOUnderground Storage Tanks · 750 ft
- BOMMARITO NISSAN INCUnderground Storage Tanks · 800 ft
- SPARK'S TUNEUPUnderground Storage Tanks · 1700 ft
- UNITED MART 2Underground Storage Tanks · 1800 ft
- U S $1 75 CLEANERS-W FLORISSANTBrownfields · 1900 ft
- ROYAL OAKS JEEPUnderground Storage Tanks · 2100 ft
- COMPLETE AUTO BODYBrownfields · 2200 ft
- TOMS SUNOCOUnderground Storage Tanks · 2400 ft
- FAMILY DOLLAR # 3352Brownfields · 2400 ft
- WALLIS PETROLEUM, L.C. #9013Underground Storage Tanks · 2500 ft
- CITY OF DELLWOODUnderground Storage Tanks · 0.5 mi
- ENERGY EXPRESS #1315Underground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dellwood'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 Dellwood.
Sources Checked
within ~10 miles of Dellwood
Severity Distribution
within ~10 miles of Dellwood
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dellwood, two things run higher than the national average within ~10 miles of Dellwood — Toxics Release Inventory (272 sites) and Superfund (43 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.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Dellwood
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 Dellwood average
Your land is one point inside Dellwood
Everything above resolves to Dellwood as a whole — one PHZM band and one 28°F frost record, read across 664 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 Dellwood Average
Dellwood Average
- ●USDA Zones 7a, averaged across Dellwood
- ●One soil character for all of Dellwood
- ●Frost dates read at Dellwood's scale: Mar 19 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Dellwood's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dellwood
Pull a site-specific report for your exact address in Dellwood, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dellwood averages can't show:
We read public map data around Dellwood — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dellwood average
How we know this about Dellwood
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 Dellwood’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 Dellwood
When does frost risk typically end in Dellwood?
The last hard freeze (28°F) in Dellwood typically lands around Mar 19, 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 9.
When is the first frost in Dellwood?
The first hard freeze (28°F) in Dellwood typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 246 days after the spring freeze cleared.
How long is the growing season in Dellwood?
Measured between 28°F hard freezes, Dellwood sees about 246 frost-free days — roughly Mar 19 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Nov 6, about 211 days.
Is the soil safe to grow vegetables in Dellwood?
The federal record around Dellwood runs heavier than most — 3,423 documented sites, mostly Underground Storage Tanks entries (2,081), the nearest Underground Storage Tanks record about 0.1 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 Dellwood?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dellwood's scale — its 7a band and its 246-day season. Your yard writes its own version of Dellwood'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 Dellwood’s own scale
7 of the readings below were taken at Dellwood's own scale — its own ~246-day season between 28°F freezes, the 664 acres it covers and 3,423 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dellwood's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Dellwood's own 28°F hard-freeze dates, about Mar 19 and Nov 20 and the ~246-day span between themNOAA 1991–2020 Climate Normals
- 3,423 documented contamination sites on the federal record near Dellwood, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Dellwood's boundary and the 664 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~246-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dellwood's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Dellwood 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 Dellwood's 664 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 Dellwood's 664 acreswhy one lot differs from the next →
- Which side of Dellwood you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 664 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Dellwood-wide figureread your own land →
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