Cullison, Kansas, 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.
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 Cullison, 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 Cullison 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 Cullison — soil, climate, flood, and parcel records. How we handle your address.
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Cullison — the short answer
Cullison, Kansas: USDA zone 6b, about 209 days between hard freezes, across 107 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)
- Oct 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~209
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 107 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 Cullison's average, not your lot's — a low corner or a tree line moves it. Against Cullison's 209-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cullison
Each reading below is measured for Cullison itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCullison runs about 209 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
MeasuredCullison 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 Cullison is in
Cullison sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Cullison's own centroid rather than borrowed from Pratt County.
What Grows in Cullison
Every plant below cleared Cullison's own zone 6b and its 209-day season. Each card opens that plant's Kansas profile. How we score.
Is it too late to plant in Cullison?
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 Oct 31 — 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 Cullison
Closest first, within ~10 miles of Cullison. Listing isn't leaking, and distance isn't exposure.
- 28S 14W 07BBB 01Nitrate · 900 ft
- ADM GRAIN CO. - CULLISONUnderground Storage Tanks · 1300 ft
- 27S 15W 35CDC 01Nitrate · 1.9 mi
- 27S 15W 34CCC 01Nitrate · 3.0 mi
- 28S 15W 23CBB 01Nitrate · 3.1 mi
- PRATT FEEDERS, LLC.CAFO · 3.9 mi
- 28S 15W 25CDD 01Nitrate · 4.0 mi
- CULLISON R REPEATER STATIONUnderground Storage Tanks · 4.2 mi
- 28S 14W 11BBA 01Nitrate · 4.3 mi
- 28S 14W 11BBD 01Nitrate · 4.3 mi
- 28S 14W 02CDC 01Nitrate · 4.4 mi
- 27S 15W 14CCC 01Nitrate · 4.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Cullison'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 Cullison.
Total Sites
155
within ~10 miles of Cullison
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Cullison
Severity Distribution
within ~10 miles of Cullison
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cullison, Nitrate runs higher than the national average — 78 sites within ~10 miles of Cullison. That's not a problem with your land — it's information about 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 Cullison
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 Cullison average
Your land is one point inside Cullison
Everything above resolves to Cullison as a whole — one PHZM band and one 28°F frost record, read across 107 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 Cullison Average
Cullison Average
- ●USDA Zones 6b, averaged across Cullison
- ●One soil character for all of Cullison
- ●Frost dates read at Cullison's scale: Apr 5 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Cullison's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cullison
Pull a site-specific report for your exact address in Cullison, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cullison averages can't show:
We read public map data around Cullison — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cullison average
How we know this about Cullison
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 Cullison’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 Cullison
When does frost risk typically end in Cullison?
The last hard freeze (28°F) in Cullison 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 Cullison?
The first hard freeze (28°F) in Cullison typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 209 days after the spring freeze cleared.
How long is the growing season in Cullison?
Measured between 28°F hard freezes, Cullison sees about 209 frost-free days — roughly Apr 5 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 26 to Oct 17, about 174 days.
Is the soil safe to grow vegetables in Cullison?
The federal record around Cullison shows 155 documented sites, mostly Nitrate entries (78), the nearest Nitrate record about 0.2 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 Cullison?
From about Oct 1 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 Oct 31 (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 Oct 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cullison's scale — its 6b band and its 209-day season. Your yard writes its own version of Cullison'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 Cullison’s own scale
6 of the readings below were taken at Cullison's own scale — its own ~209-day season between 28°F freezes, the 107 acres it covers and 155 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cullison's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Cullison's own 28°F hard-freeze dates, about Apr 5 and Oct 31 and the ~209-day span between themNOAA 1991–2020 Climate Normals
- 155 documented contamination sites on the federal record near Cullison, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Cullison's boundary and the 107 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~209-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cullison's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cullison's 107 acres read through its county's SSURGO summaryfrom Pratt County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pratt 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 Pratt County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cullison's 107 acreswhy one lot differs from the next →
- Which side of Cullison you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 107 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate 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 Cullison-wide figureread your own land →