Blackburn, Missouri, sits in USDA hardiness zone 6b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 Blackburn, 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 Blackburn 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 Blackburn — soil, climate, flood, and parcel records. How we handle your address.
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Blackburn — the short answer
Blackburn, Missouri: USDA zone 6b, about 219 days between hard freezes, across 198 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 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 198 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 Blackburn's average, not your lot's — a low corner or a tree line moves it. Against Blackburn's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Blackburn
Each reading below is measured for Blackburn itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBlackburn runs about 219 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
MeasuredBlackburn 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 Blackburn is in
Blackburn sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Blackburn's own centroid rather than borrowed from Saline County.
What Grows in Blackburn
Every plant below cleared Blackburn's own zone 6b and its 219-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Blackburn?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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 3 — 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 Blackburn
Survey cells within 31 miles of Blackburn checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 331 miles off. What to watch for.
What's on the federal record near Blackburn
Closest first, within ~10 miles of Blackburn. Listing isn't leaking, and distance isn't exposure.
- KNIPMEYER'S SERVICEUnderground Storage Tanks · 750 ft
- FERTILIZER PLANTUnderground Storage Tanks · 800 ft
- T51N R23W 31CD 2Nitrate · 1.2 mi
- WHITEMAN AFB ALPHA-11Underground Storage Tanks · 1.5 mi
- T50N R24W 36BDNitrate · 1.7 mi
- T50N R24W 28ADD1Nitrate · 3.3 mi
- RANDALL MAHNKENUnderground Storage Tanks · 3.3 mi
- DON'S GETTY SERVUnderground Storage Tanks · 3.3 mi
- T49N R23W 04ACANitrate · 3.6 mi
- WHITEMAN AFB ALPHA-1BUnderground Storage Tanks · 3.6 mi
- WHITEMAN AFB ALPHA-1AUnderground Storage Tanks · 3.6 mi
- CROSS ROADS COUNTRY MARKETUnderground Storage Tanks · 3.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Blackburn'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 Blackburn.
Total Sites
115
within ~10 miles of Blackburn
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Blackburn
Severity Distribution
within ~10 miles of Blackburn
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Blackburn, two things run higher than the national average within ~10 miles of Blackburn — CAFO (7 sites) and Nitrate (44 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Blackburn
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 Blackburn average
Your land is one point inside Blackburn
Everything above resolves to Blackburn as a whole — one PHZM band and one 28°F frost record, read across 198 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 Blackburn Average
Blackburn Average
- ●USDA Zones 6b, averaged across Blackburn
- ●One soil character for all of Blackburn
- ●Frost dates read at Blackburn's scale: Mar 29 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Blackburn's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Blackburn
Pull a site-specific report for your exact address in Blackburn, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Blackburn averages can't show:
We read public map data around Blackburn — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Blackburn average
How we know this about Blackburn
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 Blackburn’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 Blackburn
When does frost risk typically end in Blackburn?
The last hard freeze (28°F) in Blackburn 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 Blackburn?
The first hard freeze (28°F) in Blackburn typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 219 days after the spring freeze cleared.
How long is the growing season in Blackburn?
Measured between 28°F hard freezes, Blackburn sees about 219 frost-free days — roughly Mar 29 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 20, about 184 days.
Is the soil safe to grow vegetables in Blackburn?
The federal record around Blackburn shows 115 documented sites, mostly Underground Storage Tanks entries (57), the nearest Underground Storage Tanks record about 0.1 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Blackburn?
From about Oct 4 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 3 (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 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Blackburn's scale — its 6b band and its 219-day season. Your yard writes its own version of Blackburn'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 Blackburn’s own scale
7 of the readings below were taken at Blackburn's own scale — its own ~219-day season between 28°F freezes, the 198 acres it covers and 115 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Blackburn's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Blackburn's own 28°F hard-freeze dates, about Mar 29 and Nov 3 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 115 documented contamination sites on the federal record near Blackburn, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Blackburn's boundary and the 198 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Blackburn's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Blackburn 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 Blackburn's 198 acres read through its county's SSURGO summaryfrom Saline County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Saline 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 Saline County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Blackburn's 198 acreswhy one lot differs from the next →
- Which side of Blackburn you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 198 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Blackburn-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriBlackburn sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides