Marthasville, Missouri, sits in USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Well-matched crops include cabbage, hazelnut, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Marthasville, 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 Marthasville 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 Marthasville — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Marthasville — the short answer
Marthasville, Missouri: USDA zone 6b, about 217 days between hard freezes, across 547 acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~217
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 547 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 Marthasville's average, not your lot's — a low corner or a tree line moves it. Against Marthasville's 217-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Marthasville
Each reading below is measured for Marthasville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMarthasville runs about 217 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
MeasuredMarthasville 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 Marthasville is in
Marthasville sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Marthasville's own centroid rather than borrowed from Warren County.
What Grows in Marthasville
Every plant below cleared Marthasville's own zone 6b and its 217-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Marthasville?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Marthasville
Survey cells within 31 miles of Marthasville checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 266 miles off. What to watch for.
What's on the federal record near Marthasville
Closest first, within ~10 miles of Marthasville. Listing isn't leaking, and distance isn't exposure.
- GLOSEMEYER STOREUnderground Storage Tanks · 800 ft
- DRIEMEYER MOTOR COUnderground Storage Tanks · 1200 ft
- MFA EXCHANGEUnderground Storage Tanks · 1700 ft
- MARTHASVILLE FEED & SUPPLYUnderground Storage Tanks · 2500 ft
- FREDS TRUCKING LLCBrownfields · 0.5 mi
- CITY OF WASHINGTON AIRPORTUnderground Storage Tanks · 0.5 mi
- T45N R01W 30ADA1Nitrate · 1.0 mi
- WARCO INC.Toxics Release Inventory · 1.5 mi
- DEPPE FARMS INC.CAFO · 3.0 mi
- T45N R02W 35CCC1Nitrate · 3.6 mi
- CANAM STEEL CORPUnderground Storage Tanks · 3.6 mi
- CANAM STEEL CORP WASHINGTON PLANTBrownfields · 3.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Marthasville'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 Marthasville.
Sources Checked
within ~10 miles of Marthasville
Severity Distribution
within ~10 miles of Marthasville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Marthasville, two things run higher than the national average within ~10 miles of Marthasville — Toxics Release Inventory (24 sites) and CAFO (3 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.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Marthasville
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 Marthasville average
Your land is one point inside Marthasville
Everything above resolves to Marthasville as a whole — one PHZM band and one 28°F frost record, read across 547 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 Marthasville Average
Marthasville Average
- ●USDA Zones 6b, averaged across Marthasville
- ●One soil character for all of Marthasville
- ●Frost dates read at Marthasville's scale: Mar 29 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Marthasville's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Marthasville
Pull a site-specific report for your exact address in Marthasville, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Marthasville averages can't show:
We read public map data around Marthasville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Marthasville average
How we know this about Marthasville
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 Marthasville’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 Marthasville
When does frost risk typically end in Marthasville?
The last hard freeze (28°F) in Marthasville typically lands around Mar 29, 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 19.
When is the first frost in Marthasville?
The first hard freeze (28°F) in Marthasville typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 217 days after the spring freeze cleared.
How long is the growing season in Marthasville?
Measured between 28°F hard freezes, Marthasville sees about 217 frost-free days — roughly Mar 29 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 18, about 182 days.
Is the soil safe to grow vegetables in Marthasville?
The federal record around Marthasville is a meaningful one — 215 documented sites, mostly Underground Storage Tanks entries (78), the nearest Underground Storage Tanks 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 Marthasville?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Marthasville's scale — its 6b band and its 217-day season. Your yard writes its own version of Marthasville'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 Marthasville’s own scale
7 of the readings below were taken at Marthasville's own scale — its own ~217-day season between 28°F freezes, the 547 acres it covers and 215 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Marthasville's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Marthasville's own 28°F hard-freeze dates, about Mar 29 and Nov 1 and the ~217-day span between themNOAA 1991–2020 Climate Normals
- 215 documented contamination sites on the federal record near Marthasville, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Marthasville's boundary and the 547 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~217-day seasonGrowable Ground crop-matching engine
- The ecoregion at Marthasville's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Marthasville 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 Marthasville's 547 acres read through its county's SSURGO summaryfrom Warren County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Warren 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 Warren County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Marthasville's 547 acreswhy one lot differs from the next →
- Which side of Marthasville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 547 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Marthasville-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriMarthasville sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides