Hartsburg, Missouri, sits in USDA hardiness zone 6b — 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.
Even in Hartsburg, 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 Hartsburg 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 Hartsburg — soil, climate, flood, and parcel records. How we handle your address.
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Hartsburg — the short answer
Hartsburg, Missouri: USDA zone 6b, about 224 days between hard freezes, across 138 acres of town.
- 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 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~224
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 138 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 Hartsburg's average, not your lot's — a low corner or a tree line moves it. Against Hartsburg's 224-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hartsburg
Each reading below is measured for Hartsburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHartsburg runs about 224 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
MeasuredHartsburg 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 Hartsburg is in
Hartsburg sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hartsburg's own centroid, and it is not what its county reads: Boone County is mostly Central Irregular Plains. The wider page above you is answering a different question about different ground.
What Grows in Hartsburg
Every plant below cleared Hartsburg's own zone 6b and its 224-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Hartsburg?
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 7 — 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 Hartsburg
Survey cells within 31 miles of Hartsburg checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 303 miles off. What to watch for.
What's on the federal record near Hartsburg
Closest first, within ~10 miles of Hartsburg. Listing isn't leaking, and distance isn't exposure.
- FORMER HARTSBURG GROCERY STOREUnderground Storage Tanks · 1000 ft
- T45N R12W 07DDA1Nitrate · 2600 ft
- NICKS HOMESTEADUnderground Storage Tanks · 2.8 mi
- T46N R12W 22CDA1Nitrate · 4.2 mi
- CENTRAL MISSOURI CORRECTIONAL CENTERUnderground Storage Tanks · 4.3 mi
- C. Weber MineMining · 4.3 mi
- Chambers Jack ProspectMining · 4.4 mi
- T46N R12W 16CAB1Nitrate · 5.0 mi
- Unknown - LeadMining · 5.2 mi
- Tanner-Mcbaine MineMining · 5.5 mi
- ASHLAND MAINT BLDGUnderground Storage Tanks · 5.6 mi
- T46N R12W 15BAA1Nitrate · 5.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hartsburg'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 Hartsburg.
Total Sites
205
within ~10 miles of Hartsburg
Risk Level
High
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Hartsburg
Severity Distribution
within ~10 miles of Hartsburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hartsburg, two things run higher than the national average within ~10 miles of Hartsburg — PFAS (4 sites) and Mining (19 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Hartsburg
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 Hartsburg average
Your land is one point inside Hartsburg
Everything above resolves to Hartsburg as a whole — one PHZM band and one 28°F frost record, read across 138 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 Hartsburg Average
Hartsburg Average
- ●USDA Zones 6b, averaged across Hartsburg
- ●One soil character for all of Hartsburg
- ●Frost dates read at Hartsburg's scale: Mar 28 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Hartsburg's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hartsburg
Pull a site-specific report for your exact address in Hartsburg, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hartsburg averages can't show:
We read public map data around Hartsburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hartsburg average
How we know this about Hartsburg
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 Hartsburg’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 Hartsburg
When does frost risk typically end in Hartsburg?
The last hard freeze (28°F) in Hartsburg 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 Hartsburg?
The first hard freeze (28°F) in Hartsburg typically arrives around Nov 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 24, so the watching starts about Oct 8 — about 224 days after the spring freeze cleared.
How long is the growing season in Hartsburg?
Measured between 28°F hard freezes, Hartsburg sees about 224 frost-free days — roughly Mar 28 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Oct 24, about 189 days.
Is the soil safe to grow vegetables in Hartsburg?
The federal record around Hartsburg runs heavier than most — 205 documented sites, mostly Underground Storage Tanks entries (89), the nearest Underground Storage Tanks 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 Hartsburg?
From about Oct 8 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 7 (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 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hartsburg's scale — its 6b band and its 224-day season. Your yard writes its own version of Hartsburg'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 Hartsburg’s own scale
7 of the readings below were taken at Hartsburg's own scale — its own ~224-day season between 28°F freezes, the 138 acres it covers and 205 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hartsburg's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Hartsburg's own 28°F hard-freeze dates, about Mar 28 and Nov 7 and the ~224-day span between themNOAA 1991–2020 Climate Normals
- 205 documented contamination sites on the federal record near Hartsburg, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Hartsburg's boundary and the 138 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~224-day seasonGrowable Ground crop-matching engine
- Hartsburg sits in the Interior River Valleys and Hills — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around Hartsburg 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 Hartsburg's 138 acres read through its county's SSURGO summaryfrom Boone County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Boone 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 Boone County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hartsburg's 138 acreswhy one lot differs from the next →
- Which side of Hartsburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 138 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 Hartsburg-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriHartsburg sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides