Sedan, Kansas, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Sedan, 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 Sedan 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 Sedan — soil, climate, flood, and parcel records. How we handle your address.
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Sedan — the short answer
Sedan, Kansas: USDA zone 7a, about 227 days between hard freezes, across 526 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 526 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 7a is Sedan's average, not your lot's — a low corner or a tree line moves it. Against Sedan's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sedan
Each reading below is measured for Sedan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSedan runs about 227 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
MeasuredSedan sits in USDA hardiness zone 7a.
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 Sedan is in
Sedan sits in the Cross Timbers — EPA Level III, inside the wider Great Plains. That is read at Sedan's own centroid rather than borrowed from Chautauqua County.
What Grows in Sedan
Every plant below cleared Sedan's own zone 7a and its 227-day season. Each card opens that plant's Kansas profile. How we score.
Is it too late to plant in Sedan?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 9 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Sedan
Closest first, within ~10 miles of Sedan. Listing isn't leaking, and distance isn't exposure.
- USD #286 SEDAN HIGH SCHOOLBrownfields · 550 ft
- RONS GARAGEBrownfields · 600 ft
- USD #286 SEDAN HIGH SCHOOLUnderground Storage Tanks · 800 ft
- SEDAN, CITY OFUnderground Storage Tanks · 850 ft
- TOTAL SERVICE, BOB'SUnderground Storage Tanks · 1000 ft
- MORTAN EQUIPMENT COMPANYUnderground Storage Tanks · 1100 ft
- VERMILLION GRAIN CO INCUnderground Storage Tanks · 1100 ft
- KERR-MCGEE #6715Underground Storage Tanks · 1200 ft
- SEDAN RURAL HEALTH CLINICBrownfields · 1300 ft
- U PUMP IT #223Underground Storage Tanks · 1700 ft
- SEDAN CITY HOSPBrownfields · 2100 ft
- KANSAS DEPT OF TRANSPORTATIONUnderground Storage Tanks · 2200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Sedan'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 Sedan.
Total Sites
48
within ~10 miles of Sedan
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Sedan
Severity Distribution
within ~10 miles of Sedan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sedan, Nitrate runs higher than the national average — 32 sites within ~10 miles of Sedan. 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 Sedan
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 Sedan average
Your land is one point inside Sedan
Everything above resolves to Sedan as a whole — one PHZM band and one 28°F frost record, read across 526 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 Sedan Average
Sedan Average
- ●USDA Zones 7a, averaged across Sedan
- ●One soil character for all of Sedan
- ●Frost dates read at Sedan's scale: Mar 27 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Sedan's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sedan
Pull a site-specific report for your exact address in Sedan, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sedan averages can't show:
We read public map data around Sedan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sedan average
How we know this about Sedan
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 Sedan’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 Sedan
When does frost risk typically end in Sedan?
The last hard freeze (28°F) in Sedan typically lands around Mar 27, 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 17.
When is the first frost in Sedan?
The first hard freeze (28°F) in Sedan typically arrives around Nov 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 26, so the watching starts about Oct 10 — about 227 days after the spring freeze cleared.
How long is the growing season in Sedan?
Measured between 28°F hard freezes, Sedan sees about 227 frost-free days — roughly Mar 27 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 26, about 192 days.
Is the soil safe to grow vegetables in Sedan?
The federal record around Sedan is a meaningful one — 48 documented sites, mostly Nitrate entries (32), the nearest Brownfields record about 0.1 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 Sedan?
From about Oct 10 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sedan's scale — its 7a band and its 227-day season. Your yard writes its own version of Sedan'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 Sedan’s own scale
6 of the readings below were taken at Sedan's own scale — its own ~227-day season between 28°F freezes, the 526 acres it covers and 48 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sedan's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Sedan's own 28°F hard-freeze dates, about Mar 27 and Nov 9 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 48 documented contamination sites on the federal record near Sedan, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Sedan's boundary and the 526 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sedan's own centroid, the Cross TimbersUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sedan's 526 acres read through its county's SSURGO summaryfrom Chautauqua County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Chautauqua County
- The growing challenges every Kansas grower plans around — written at state scale, so they stay on the state guidefrom Kansas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Chautauqua County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sedan's 526 acreswhy one lot differs from the next →
- Which side of Sedan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 526 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Sedan-wide figureread your own land →
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