Troy, Missouri, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
A short list that earns its place here — cabbage, hazelnut, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Troy, 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 Troy 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 Troy — soil, climate, flood, and parcel records. How we handle your address.
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Troy — the short answer
Troy, Missouri: USDA zone 6b, about 223 days between hard freezes, across 5K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~223
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 5K 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 Troy's average, not your lot's — a low corner or a tree line moves it. Against Troy's 223-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Troy
Each reading below is measured for Troy itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTroy runs about 223 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
MeasuredTroy 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 Troy is in
Troy sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Troy's own centroid, and it is not what its county reads: Lincoln County is mostly Interior River Valleys and Hills. The wider page above you is answering a different question about different ground.
What Grows in Troy
Every plant below cleared Troy's own zone 6b and its 223-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Troy?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 6 — 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 Troy
Survey cells within 31 miles of Troy checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 244 miles off. What to watch for.
What's on the federal record near Troy
Closest first, within ~10 miles of Troy. Listing isn't leaking, and distance isn't exposure.
- WEBER COSTELLOToxics Release Inventory · 100 ft
- HOUGHTON MIFFLIN HARCOURT CO.Toxics Release Inventory · 900 ft
- GERBER COLLISION & GLASS TORY MO CC139020Brownfields · 1600 ft
- TROY SERVICE STATIONUnderground Storage Tanks · 1700 ft
- FASTLANE #35Underground Storage Tanks · 2100 ft
- MOST INCToxics Release Inventory · 0.5 mi
- VICTORY LANE FUEL & FOOD LLCUnderground Storage Tanks · 0.6 mi
- HILLTOP PHILLIPS 66Underground Storage Tanks · 0.6 mi
- TOYOTA MOTOR MFG MISSOURI INCBrownfields · 0.6 mi
- TOYOTA MOTOR MFG MISSOURI INCToxics Release Inventory · 0.6 mi
- SACRED HEART SCHOOLBrownfields · 0.6 mi
- TROY RIII SCHOOL DISTRICTBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Troy'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 Troy.
Sources Checked
within ~10 miles of Troy
Severity Distribution
within ~10 miles of Troy
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Troy, Toxics Release Inventory runs higher than the national average — 7 sites within ~10 miles of Troy. 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 Troy
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 Troy average
Your land is one point inside Troy
Everything above resolves to Troy as a whole — one PHZM band and one 28°F frost record, read across 5K 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 Troy Average
Troy Average
- ●USDA Zones 6b, averaged across Troy
- ●One soil character for all of Troy
- ●Frost dates read at Troy's scale: Mar 28 to Nov 6
YOUR Parcel
- ✓Your exact zone, not Troy's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Troy
Pull a site-specific report for your exact address in Troy, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Troy averages can't show:
We read public map data around Troy — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Troy average
How we know this about Troy
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 Troy’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 Troy
When does frost risk typically end in Troy?
The last hard freeze (28°F) in Troy typically lands around Mar 28, 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 18.
When is the first frost in Troy?
The first hard freeze (28°F) in Troy typically arrives around Nov 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 23, so the watching starts about Oct 7 — about 223 days after the spring freeze cleared.
How long is the growing season in Troy?
Measured between 28°F hard freezes, Troy sees about 223 frost-free days — roughly Mar 28 through Nov 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Oct 23, about 188 days.
Is the soil safe to grow vegetables in Troy?
The federal record around Troy is a meaningful one — 109 documented sites, mostly Underground Storage Tanks entries (63), the nearest Toxics Release Inventory 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.
How do I protect my plants from frost in Troy?
From about Oct 7 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Troy's scale — its 6b band and its 223-day season. Your yard writes its own version of Troy'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 Troy’s own scale
7 of the readings below were taken at Troy's own scale — its own ~223-day season between 28°F freezes, the 4,941 acres it covers and 109 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Troy's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Troy's own 28°F hard-freeze dates, about Mar 28 and Nov 6 and the ~223-day span between themNOAA 1991–2020 Climate Normals
- 109 documented contamination sites on the federal record near Troy, the closest Toxics Release Inventory record under a tenth of a mile out from the town centreFederal environmental registers
- Troy's boundary and the 4,941 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~223-day seasonGrowable Ground crop-matching engine
- Troy sits in the Central Irregular Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around Troy 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 Troy's 4,941 acres read through its county's SSURGO summaryfrom Lincoln County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lincoln 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 Lincoln County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Troy's 4,941 acreswhy one lot differs from the next →
- Which side of Troy you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,941 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record under a tenth of a mile 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 Troy-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriTroy sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides