Cassoday, Kansas, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor cabbage, hazelnut, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Cassoday, 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 Cassoday 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 Cassoday — soil, climate, flood, and parcel records. How we handle your address.
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Cassoday — the short answer
Cassoday, Kansas: USDA zone 6b, about 212 days between hard freezes, across 218 acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 5
- 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
- ~212
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 218 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 Cassoday's average, not your lot's — a low corner or a tree line moves it. Against Cassoday's 212-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cassoday
Each reading below is measured for Cassoday itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCassoday runs about 212 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
MeasuredCassoday 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 Cassoday is in
Cassoday sits in the Flint Hills — EPA Level III, inside the wider Great Plains. That is read at Cassoday's own centroid rather than borrowed from Butler County.
What Grows in Cassoday
Every plant below cleared Cassoday's own zone 6b and its 212-day season. Each card opens that plant's Kansas profile. How we score.
Is it too late to plant in Cassoday?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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 Nov 3 — 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.
What's on the federal record near Cassoday
Closest first, within ~10 miles of Cassoday. Listing isn't leaking, and distance isn't exposure.
- CASSODAY FEED & RANCH SUPPLYUnderground Storage Tanks · 450 ft
- AT&SF RAILWAY COUnderground Storage Tanks · 550 ft
- 23S 07E 23BCC 01Nitrate · 1200 ft
- AIKMAN RAILYARDUnderground Storage Tanks · 1300 ft
- RICK-N-JENNY'SUnderground Storage Tanks · 2400 ft
- CASSODAY MAINT. M.P. 92Underground Storage Tanks · 0.7 mi
- 23S 07E 21BAC 01Nitrate · 2.1 mi
- 23S 08E 07CCC 01Nitrate · 2.5 mi
- 23S 07E 10BBB 01Nitrate · 2.6 mi
- 23S 07E 36DCC 01Nitrate · 3.0 mi
- 23S 08E 30ACC 01Nitrate · 3.5 mi
- 22S 07E 35CB 01Nitrate · 3.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Cassoday'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 Cassoday.
Total Sites
75
within ~10 miles of Cassoday
Risk Level
Moderate
Highest-severity
66 nitrate monitoring sites
Severity Distribution
within ~10 miles of Cassoday
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cassoday, Nitrate runs higher than the national average — 66 sites within ~10 miles of Cassoday. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Cassoday
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 Cassoday average
Your land is one point inside Cassoday
Everything above resolves to Cassoday as a whole — one PHZM band and one 28°F frost record, read across 218 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 Cassoday Average
Cassoday Average
- ●USDA Zones 6b, averaged across Cassoday
- ●One soil character for all of Cassoday
- ●Frost dates read at Cassoday's scale: Apr 5 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Cassoday's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cassoday
Pull a site-specific report for your exact address in Cassoday, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cassoday averages can't show:
We read public map data around Cassoday — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cassoday average
How we know this about Cassoday
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 Cassoday’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 Cassoday
When does frost risk typically end in Cassoday?
The last hard freeze (28°F) in Cassoday 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.
When is the first frost in Cassoday?
The first hard freeze (28°F) in Cassoday 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 212 days after the spring freeze cleared.
How long is the growing season in Cassoday?
Measured between 28°F hard freezes, Cassoday sees about 212 frost-free days — roughly Apr 5 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 26 to Oct 20, about 177 days.
Is the soil safe to grow vegetables in Cassoday?
The federal record around Cassoday shows 75 documented sites, mostly Nitrate entries (66), the nearest Underground Storage Tanks record under a tenth of a mile 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 Cassoday?
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 Cassoday's scale — its 6b band and its 212-day season. Your yard writes its own version of Cassoday'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 Cassoday’s own scale
6 of the readings below were taken at Cassoday's own scale — its own ~212-day season between 28°F freezes, the 218 acres it covers and 75 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cassoday's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Cassoday's own 28°F hard-freeze dates, about Apr 5 and Nov 3 and the ~212-day span between themNOAA 1991–2020 Climate Normals
- 75 documented contamination sites on the federal record near Cassoday, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Cassoday's boundary and the 218 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~212-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cassoday's own centroid, the Flint HillsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cassoday's 218 acres read through its county's SSURGO summaryfrom Butler County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Butler 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 Butler County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cassoday's 218 acreswhy one lot differs from the next →
- Which side of Cassoday you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 218 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Cassoday-wide figureread your own land →
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