Macon County, in 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.
Expect cabbage, hazelnut, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Macon County holds more than one microclimate.
Soils and elevations shift across Macon County, so your frost dates and drainage aren't the county average. 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 Macon County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Macon County — the short answer
Macon County, Missouri: USDA zone 6a, about 208 days between hard freezes, across 513K acres.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 28
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~208
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 513K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 Macon County's average, not your lot's — a low corner or a tree line moves it. Against Macon County's 208-day season, see what your own ground reads.
Heat in Macon County
Across a year, Macon County accumulates about 3,429 growing degree days above 50°F, about 324 fewer than the middle Missouri county — ahead of 17 of Missouri’s 115 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Macon County
Across Macon County, the ground is predominantly Alfisols, where Armstrong, Keswick, and Winnegan are the most extensive named soil series. The soil is generally moderately well drained with a loam surface. Topsoil pH runs about 5.7–6.8, slightly acidic. Rainfall drains through hydrologic group D soils.
Soil order
Alfisols
Drainage
Moderately well drained
Prime farmland
2%
Hydric soils
23%
Soil still varies lot by lot — soil types explained.
How the ground varies across Macon County
The USDA soil survey maps 41% of Macon County as moderately well drained — but another 59% drains differently: 35% somewhat poorly drained, 19% poorly drained.
Armstrong is the most extensive named soil at 17% of mapped acres, then Keswick (15%) and Winnegan (14%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Macon County
Each reading below is measured for Macon County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Macon County are moderately well drained, in hydrologic group D — roughly the middle of the drainage range.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Macon County runs about pH 5.7–6.8, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Wet ground
MeasuredAbout 23% of Macon County is mapped as hydric — wetland — soil.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Season length
MeasuredMacon County runs about 208 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
The kind of country Macon County is in
Macon County sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. One consistent ecological setting across the whole county.
What Grows in Macon County
We scored all 1,086 plants against Macon County's own USDA zone 6a and its own 208-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Missouri profile.
Is it too late to plant in Macon County?
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 Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 28 — 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 gets applied to farmland in Macon County
USGS estimates 182,615 lb of Glyphosate on Macon County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (70,506 lb) and Atrazine (53,420 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Macon County — and how to grow with it.
We checked the federal record across Macon County — 134 documented sites across 6 of the 9 source types we track.
The most significant on record: 1 Superfund site (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Macon County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Macon County
Closest first, across Macon County. Listing isn't leaking, and distance isn't exposure.
- JOHN MCVICKER SWINECAFO · 1.5 mi
- RICK MCVICKERCAFO · 2.2 mi
- LOVES TRAVEL STOP #621Underground Storage Tanks · 4.6 mi
- ATLANTA WILDLIFE AREAUnderground Storage Tanks · 4.6 mi
- J.P. TIRE STOREUnderground Storage Tanks · 4.8 mi
- LONG BRANCH STATE PARK MARINA, INCUnderground Storage Tanks · 4.9 mi
- BINDER BACK AUTO BODYBrownfields · 5.1 mi
- T57N R15W 17AAA1Nitrate · 5.1 mi
- MODOTBrownfields · 5.2 mi
- MACON MAINT LOTUnderground Storage Tanks · 5.2 mi
- APCO STATIONUnderground Storage Tanks · 5.8 mi
- LONG BRANCH LAKEUnderground Storage Tanks · 6.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Macon County'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 Macon County.
Total Sites
134
across Macon County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Macon County
Severity Distribution
across Macon County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Macon County, two things run higher than the national average across Macon County — CAFO (5 sites) and Nitrate (38 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Macon County
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 Macon County average
Your land is one point inside Macon County
Everything above resolves to Macon County as a whole — one PHZM band and one county frost record, read across 513K 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 county 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 county average.
Your Lot vs the Macon County Average
Macon County Average
- ●USDA Zones 6a, averaged across Macon County
- ●One soil character for all of Macon County
- ●Frost dates read at Macon County's scale: Apr 3 to Oct 28
YOUR Parcel
- ✓Your exact zone, not Macon County's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Macon County
Pull a site-specific report for your exact address in Macon County, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Macon County averages can't show:
We read public map data around Macon County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Macon County average
How we know this about Macon County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Macon County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Macon County
When does frost risk typically end in Macon County?
The last hard freeze (28°F) in Macon County typically lands around Apr 3, 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 24.
How long is the growing season in Macon County?
Measured between 28°F hard freezes, Macon County sees about 208 frost-free days — roughly Apr 3 through Oct 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 14, about 173 days.
Is the soil safe to grow vegetables in Macon County?
The federal record around Macon County is a meaningful one — 134 documented sites, mostly Underground Storage Tanks entries (68), the nearest CAFO record about 1.5 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.
Everything above is measured at Macon County's scale — its 6a band and its 208-day season. Your yard writes its own version of Macon County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Missouri's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Macon County’s own scale
8 of the readings below were taken at Macon County's own scale — its own ~208-day span between 28°F freezes, the 3 most extensive soil series mapped here and 134 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Macon County's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Macon County's own 28°F hard-freeze dates and its ~208-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Macon CountyUSDA NRCS SSURGO
- 134 documented contamination sites inside the county boundary, distance-sorted from its center — the closest CAFO record about 1.5 miles outFederal environmental registers
- Macon County's boundary and the 512,773 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~208-day seasonGrowable Ground crop-matching engine
- Macon County sitting wholly inside the Central Irregular PlainsUS EPA Level III Ecoregions
- Which agricultural compounds go onto Macon County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
What this page can’t tell you
- How the season shifts across Macon County — the ~208 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Macon County's 512,773 acreswhy one lot differs from the next →
- Which of those 134 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Macon Countyread your own land →