Jackson County, in Kansas, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Jackson County holds more than one microclimate.
Soils and elevations shift across Jackson 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 Jackson County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Jackson County — the short answer
Jackson County, Kansas: USDA zone 6a, about 207 days between hard freezes, across 420K acres.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 5
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~207
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 420K 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 Jackson County's average, not your lot's — a low corner or a tree line moves it. Against Jackson County's 207-day season, see what your own ground reads.
Heat in Jackson County
Across a year, Jackson County accumulates about 3,631 growing degree days above 50°F, about 202 fewer than the middle Kansas county — ahead of 32 of Kansas’s 105 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 Jackson County
Across Jackson County, the ground is predominantly Mollisols, where Pawnee, Martin, and Kennebec are the most extensive named soil series. The soil is generally moderately well drained with a clay loam surface. Topsoil pH runs about 5.6–6.5, moderately acidic. Rainfall drains through hydrologic group D soils.
Soil order
Mollisols
Drainage
Moderately well drained
Prime farmland
30%
Hydric soils
4%
Soil still varies lot by lot — soil types explained.
How the ground varies across Jackson County
The USDA soil survey maps 73% of Jackson County as moderately well drained — but another 27% drains differently: 17% well drained, 4% poorly drained.
Pawnee is the most extensive named soil at 33% of mapped acres, then Martin (18%) and Kennebec (11%).
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 Jackson County
Each reading below is measured for Jackson 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 Jackson 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 Jackson County runs about pH 5.6–6.5, 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
Season length
MeasuredJackson County 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
MeasuredJackson County 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 Jackson County is in
Jackson County spans 3 EPA Level III ecoregions — Western Corn Belt Plains (77%), Flint Hills (18%) and Central Irregular Plains (5%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Jackson County
We scored all 1,086 plants against Jackson County's own USDA zone 6a and its own 207-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 Kansas profile.
Is it too late to plant in Jackson County?
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 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 5 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Jackson County
- monarch butterfly2 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Jackson County
USGS estimates 115,981 lb of Glyphosate on Jackson County farmland in 2019, its largest by weight, ahead of Atrazine (72,212 lb) and Acephate (52,636 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 Jackson County — and how to grow with it.
We checked the federal record across Jackson County — 236 documented sites across 7 of the 9 source types we track.
The most significant on record: 2 Superfund sites (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 Jackson 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 Jackson County
Closest first, across Jackson County. Listing isn't leaking, and distance isn't exposure.
- 07S 15E 30BBAA01Nitrate · 0.7 mi
- 07S 15E 29BBC 01Nitrate · 1.2 mi
- 07S 14E 23CDDB01Nitrate · 1.6 mi
- 08S 14E 01ADAD01 PBPN MW11Nitrate · 1.7 mi
- MW11Nitrate · 1.7 mi
- 07S 14E 23CCDA01Nitrate · 1.8 mi
- LITTLE WILLIES STEAKHOUSEUnderground Storage Tanks · 2.6 mi
- HENRY BROS IMPBrownfields · 2.6 mi
- 08S 15E 07BCDA01 SITE 15-3Nitrate · 2.8 mi
- 07S 14E 27CCC 01Nitrate · 2.9 mi
- MIDWEST CONSTRUCTION CO INCUnderground Storage Tanks · 3.0 mi
- ROEDIGER OIL COUnderground Storage Tanks · 3.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Jackson 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 Jackson County.
Total Sites
236
across Jackson County
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
across Jackson County
Severity Distribution
across Jackson County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jackson County, Nitrate runs higher than the national average — 168 sites across Jackson County. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Jackson 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 Jackson County average
Your land is one point inside Jackson County
Everything above resolves to Jackson County as a whole — one PHZM band and one county frost record, read across 420K 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 Jackson County Average
Jackson County Average
- ●USDA Zones 6a, averaged across Jackson County
- ●One soil character for all of Jackson County
- ●Frost dates read at Jackson County's scale: Apr 5 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Jackson County's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Jackson County
Pull a site-specific report for your exact address in Jackson County, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jackson County averages can't show:
We read public map data around Jackson County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jackson County average
How we know this about Jackson 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 Jackson County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Jackson County
When does frost risk typically end in Jackson County?
The last hard freeze (28°F) in Jackson County typically lands around Apr 5, 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 26.
How long is the growing season in Jackson County?
Measured between 28°F hard freezes, Jackson County sees about 207 frost-free days — roughly Apr 5 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 26 to Oct 15, about 172 days.
Is the soil safe to grow vegetables in Jackson County?
The federal record around Jackson County is a meaningful one — 236 documented sites, mostly Nitrate entries (168), the nearest Nitrate record about 0.7 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 Jackson County's scale — its 6a band and its 207-day season. Your yard writes its own version of Jackson 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 Kansas's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Jackson County’s own scale
9 of the readings below were taken at Jackson County's own scale — its own ~207-day span between 28°F freezes, the 3 most extensive soil series mapped here and 236 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Jackson County's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Jackson County's own 28°F hard-freeze dates and its ~207-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Jackson CountyUSDA NRCS SSURGO
- 236 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 0.7 miles outFederal environmental registers
- Jackson County's boundary and the 419,980 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 3 ecoregions Jackson County spans, Western Corn Belt Plains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Jackson County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Jackson County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Kansas grower plans around — written at state scale, so they stay on the state guidefrom Kansas
What this page can’t tell you
- How the season shifts across Jackson County — the ~207 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 Jackson County's 419,980 acreswhy one lot differs from the next →
- Which of those 236 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 Jackson Countyread your own land →