Amazonia, Missouri, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
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 Amazonia, 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 Amazonia 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 Amazonia — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Amazonia — the short answer
Amazonia, Missouri: USDA zone 6a, about 207 days between hard freezes, across 236 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~207
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 236 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 6a is Amazonia's average, not your lot's — a low corner or a tree line moves it. Against Amazonia's 207-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Amazonia
Each reading below is measured for Amazonia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAmazonia runs about 207 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
MeasuredAmazonia sits in USDA hardiness zone 6a.
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 Amazonia is in
Amazonia sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Amazonia's own centroid rather than borrowed from Andrew County.
What Grows in Amazonia
Every plant below cleared Amazonia's own zone 6a and its 207-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Amazonia?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — 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.
What's on the federal record near Amazonia
Closest first, within ~10 miles of Amazonia. Listing isn't leaking, and distance isn't exposure.
- AMAZONIA ABANDONED TANKSuperfund · 1100 ft
- T59N R36W 36CBD1Nitrate · 2000 ft
- WHEELING DISPOSAL SERVICE CO., INC., LANDFILLSuperfund · 1.5 mi
- AMAZONIA, MO STOCKPILEToxics Release Inventory · 2.1 mi
- T58N R36W 23DBB1Nitrate · 2.2 mi
- STRVPAS1 MO01Nitrate · 3.6 mi
- NORRIS ASPHALT PAVING CO-BREIT QUARRY PLANTToxics Release Inventory · 4.1 mi
- OREILLY AUTO PARTS STORE 302Brownfields · 4.6 mi
- MO AMERICAN ST JOSEPHPFAS · 4.7 mi
- ANDREW COUNTY PWSD 1PFAS · 4.7 mi
- 02S 22E 32ABC 01Nitrate · 4.7 mi
- MODEL CLEANERS-SAVANNAHBrownfields · 4.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Amazonia'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 Amazonia.
Sources Checked
within ~10 miles of Amazonia
Severity Distribution
within ~10 miles of Amazonia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Amazonia, two things run higher than the national average within ~10 miles of Amazonia — Superfund (10 sites) and PFAS (4 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Amazonia
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 Amazonia average
Your land is one point inside Amazonia
Everything above resolves to Amazonia as a whole — one PHZM band and one 28°F frost record, read across 236 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 town 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 Amazonia Average
Amazonia Average
- ●USDA Zones 6a, averaged across Amazonia
- ●One soil character for all of Amazonia
- ●Frost dates read at Amazonia's scale: Apr 6 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Amazonia's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Amazonia
Pull a site-specific report for your exact address in Amazonia, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Amazonia averages can't show:
We read public map data around Amazonia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Amazonia average
How we know this about Amazonia
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Amazonia’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 town grain anywhere on this page — there is no town-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 Amazonia
When does frost risk typically end in Amazonia?
The last hard freeze (28°F) in Amazonia typically lands around Apr 6, 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 27.
When is the first frost in Amazonia?
The first hard freeze (28°F) in Amazonia typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 207 days after the spring freeze cleared.
How long is the growing season in Amazonia?
Measured between 28°F hard freezes, Amazonia sees about 207 frost-free days — roughly Apr 6 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 27 to Oct 16, about 172 days.
Is the soil safe to grow vegetables in Amazonia?
The federal record around Amazonia is a meaningful one — 331 documented sites, mostly Underground Storage Tanks entries (189), the nearest Superfund 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 Amazonia?
From about Sep 30 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 Oct 30 (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 Oct 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Amazonia's scale — its 6a band and its 207-day season. Your yard writes its own version of Amazonia'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 Amazonia’s own scale
6 of the readings below were taken at Amazonia's own scale — its own ~207-day season between 28°F freezes, the 236 acres it covers and 331 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Amazonia's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Amazonia's own 28°F hard-freeze dates, about Apr 6 and Oct 30 and the ~207-day span between themNOAA 1991–2020 Climate Normals
- 331 documented contamination sites on the federal record near Amazonia, the closest Superfund record about 0.2 miles out from the town centreFederal environmental registers
- Amazonia's boundary and the 236 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~207-day seasonGrowable Ground crop-matching engine
- The ecoregion at Amazonia's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Amazonia's 236 acres read through its county's SSURGO summaryfrom Andrew County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Andrew 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 Andrew County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Amazonia's 236 acreswhy one lot differs from the next →
- Which side of Amazonia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 236 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Superfund 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 Amazonia-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriAmazonia sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides