Crystal City, Missouri, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Crystal City, 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 Crystal City 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 Crystal City — soil, climate, flood, and parcel records. How we handle your address.
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Crystal City — the short answer
Crystal City, Missouri: USDA zone 7a, about 225 days between hard freezes, across 3K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~225
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 Crystal City's average, not your lot's — a low corner or a tree line moves it. Against Crystal City's 225-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Crystal City
Each reading below is measured for Crystal City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCrystal City runs about 225 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
MeasuredCrystal City 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 Crystal City is in
Crystal City sits in the Ozark Highlands — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Crystal City's own centroid rather than borrowed from Jefferson County.
What Grows in Crystal City
Every plant below cleared Crystal City's own zone 7a and its 225-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Crystal City?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — 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 Crystal City
Survey cells within 31 miles of Crystal City checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 249 miles off. What to watch for.
What's on the federal record near Crystal City
Closest first, within ~10 miles of Crystal City. Listing isn't leaking, and distance isn't exposure.
- VOGUE CLEANERS-CRYSTAL CITYBrownfields · 1100 ft
- CRYSTAL CAR CAREUnderground Storage Tanks · 1300 ft
- CITY OF CRYSTAL CITYUnderground Storage Tanks · 1400 ft
- NEAL CHEVROLET COMPANYUnderground Storage Tanks · 1700 ft
- PPG INDUSTRIES INC. WORKS 9Toxics Release Inventory · 1800 ft
- PPG INDUSTRIES, INCUnderground Storage Tanks · 1800 ft
- MIDTOWN MOBILUnderground Storage Tanks · 2000 ft
- MANNS AUTO BODYBrownfields · 2000 ft
- TEMP MASTERSBrownfields · 2000 ft
- CRYSTAL CITY #1Underground Storage Tanks · 2000 ft
- BP AMOCOUnderground Storage Tanks · 2000 ft
- O.J. WIND ENTERPRISES, INCUnderground Storage Tanks · 2200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Crystal City'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 Crystal City.
Total Sites
361
within ~10 miles of Crystal City
Risk Level
High
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Crystal City
Severity Distribution
within ~10 miles of Crystal City
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Crystal City, two things run higher than the national average within ~10 miles of Crystal City — PFAS (7 sites) and Mining (28 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.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Crystal City
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 Crystal City average
Your land is one point inside Crystal City
Everything above resolves to Crystal City as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Crystal City Average
Crystal City Average
- ●USDA Zones 7a, averaged across Crystal City
- ●One soil character for all of Crystal City
- ●Frost dates read at Crystal City's scale: Mar 25 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Crystal City's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Crystal City
Pull a site-specific report for your exact address in Crystal City, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Crystal City averages can't show:
We read public map data around Crystal City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Crystal City average
How we know this about Crystal City
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 Crystal City’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 Crystal City
When does frost risk typically end in Crystal City?
The last hard freeze (28°F) in Crystal City typically lands around Mar 25, 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 15.
When is the first frost in Crystal City?
The first hard freeze (28°F) in Crystal City typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 225 days after the spring freeze cleared.
How long is the growing season in Crystal City?
Measured between 28°F hard freezes, Crystal City sees about 225 frost-free days — roughly Mar 25 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 15 to Oct 22, about 190 days.
Is the soil safe to grow vegetables in Crystal City?
The federal record around Crystal City runs heavier than most — 361 documented sites, mostly Underground Storage Tanks entries (140), the nearest Brownfields record about 0.2 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 Crystal City?
From about Oct 6 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Crystal City's scale — its 7a band and its 225-day season. Your yard writes its own version of Crystal City'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 Crystal City’s own scale
7 of the readings below were taken at Crystal City's own scale — its own ~225-day season between 28°F freezes, the 2,890 acres it covers and 361 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Crystal City's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Crystal City's own 28°F hard-freeze dates, about Mar 25 and Nov 5 and the ~225-day span between themNOAA 1991–2020 Climate Normals
- 361 documented contamination sites on the federal record near Crystal City, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Crystal City's boundary and the 2,890 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~225-day seasonGrowable Ground crop-matching engine
- The ecoregion at Crystal City's own centroid, the Ozark HighlandsUS EPA Level III Ecoregions
- Lanternfly survey cells around Crystal City 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 Crystal City's 2,890 acres read through its county's SSURGO summaryfrom Jefferson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Jefferson 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 Jefferson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Crystal City's 2,890 acreswhy one lot differs from the next →
- Which side of Crystal City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,890 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 Crystal City-wide figureread your own land →
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