Kingfisher County, in Oklahoma, sits in USDA hardiness zone 7a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, hazelnut, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Kingfisher County holds more than one microclimate.
Soils and elevations shift across Kingfisher 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 Kingfisher County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Kingfisher County — the short answer
Kingfisher County, Oklahoma: USDA zone 7a, about 230 days between hard freezes, across 575K acres.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 26
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~230
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 575K 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 7a is Kingfisher County's average, not your lot's — a low corner or a tree line moves it. Against Kingfisher County's 230-day season, see what your own ground reads.
Heat and winter chill in Kingfisher County
Across a year, Kingfisher County accumulates about 4,716 growing degree days above 50°F, about 4 fewer than the middle Oklahoma county — ahead of 37 of Oklahoma’s 77 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.
Winter banks about 2,073 hours below 45°F, 154 more than the Oklahoma middle of 1,919. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Kingfisher County
Across Kingfisher County, the ground is predominantly Mollisols, where Lovedale, Kingfisher, and Grainola are the most extensive named soil series. The soil is generally well drained with a fine sandy loam surface. Topsoil pH runs about 6.3–7.0, neutral. Rainfall drains through hydrologic group C soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
55%
Hydric soils
1%
Soil still varies lot by lot — soil types explained.
How the ground varies across Kingfisher County
The USDA soil survey maps 89% of Kingfisher County as well drained — but another 10% drains differently: 4% excessively drained, 3% somewhat excessively drained.
Lovedale is the most extensive named soil at 11% of mapped acres, then Kingfisher (10%) and Grainola (9%).
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 Kingfisher County
Each reading below is measured for Kingfisher 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 Kingfisher County are well drained, in hydrologic group C — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Kingfisher County runs about pH 6.3–7.0, 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
MeasuredKingfisher County runs about 230 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
MeasuredKingfisher County 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 Kingfisher County is in
Kingfisher County sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. One consistent ecological setting across the whole county.
What Grows in Kingfisher County
We scored all 1,086 plants against Kingfisher County's own USDA zone 7a and its own 230-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 Oklahoma profile.
Is it too late to plant in Kingfisher County?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — 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 Kingfisher County
- monarch butterfly100 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Kingfisher County
USGS estimates 43,437 lb of 2,4-d on Kingfisher County farmland in 2019, its largest by weight, ahead of Glyphosate (37,054 lb) and Triclopyr (16,177 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 Kingfisher County — and how to grow with it.
We checked the federal record across Kingfisher County — 469 documented sites across 5 of the 9 source types we track.
The most significant on record: 6 Toxics Release Inventory facilities. Active industrial facilities reporting chemical releases to air, water, and land.
There's a meaningful federal record across Kingfisher 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 Kingfisher County
Closest first, across Kingfisher County. Listing isn't leaking, and distance isn't exposure.
- 17N-07W-11 D 2Nitrate · 1.5 mi
- 17N-07W-11 D 1Nitrate · 1.6 mi
- Oklahoma Dept Of TransportationUnderground Storage Tanks · 1.7 mi
- 17N-07W-12 CA 1Nitrate · 2.1 mi
- 17N-07W-04 DBB 1Nitrate · 2.2 mi
- P&K Equipment Inc.Underground Storage Tanks · 2.2 mi
- 81 Express LlcUnderground Storage Tanks · 2.4 mi
- Redfork StationUnderground Storage Tanks · 2.5 mi
- 17N-07W-01 C 1Nitrate · 2.5 mi
- FARRAR TANK TRUCKS & CONSTRUCTIONBrownfields · 2.7 mi
- 17N-07W-36 1Nitrate · 3.3 mi
- Kloeppel Store & StationUnderground Storage Tanks · 3.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Kingfisher 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 Kingfisher County.
Total Sites
469
across Kingfisher County
Risk Level
Elevated
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
across Kingfisher County
Severity Distribution
across Kingfisher County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kingfisher County, Nitrate runs higher than the national average — 318 sites across Kingfisher 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 Kingfisher 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 Kingfisher County average
Your land is one point inside Kingfisher County
Everything above resolves to Kingfisher County as a whole — one PHZM band and one county frost record, read across 575K 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 Kingfisher County Average
Kingfisher County Average
- ●USDA Zones 7a, averaged across Kingfisher County
- ●One soil character for all of Kingfisher County
- ●Frost dates read at Kingfisher County's scale: Mar 26 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Kingfisher County's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Kingfisher County
Pull a site-specific report for your exact address in Kingfisher County, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kingfisher County averages can't show:
We read public map data around Kingfisher County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kingfisher County average
How we know this about Kingfisher 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 Kingfisher County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Kingfisher County
When does frost risk typically end in Kingfisher County?
The last hard freeze (28°F) in Kingfisher County typically lands around Mar 26, 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 16.
How long is the growing season in Kingfisher County?
Measured between 28°F hard freezes, Kingfisher County sees about 230 frost-free days — roughly Mar 26 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Oct 28, about 195 days.
Is the soil safe to grow vegetables in Kingfisher County?
The federal record around Kingfisher County is a meaningful one — 469 documented sites, mostly Nitrate entries (318), the nearest Nitrate record about 1.5 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 Kingfisher County's scale — its 7a band and its 230-day season. Your yard writes its own version of Kingfisher 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 Oklahoma's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Kingfisher County’s own scale
9 of the readings below were taken at Kingfisher County's own scale — its own ~230-day span between 28°F freezes, the 3 most extensive soil series mapped here and 469 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Kingfisher County's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Kingfisher County's own 28°F hard-freeze dates and its ~230-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Kingfisher CountyUSDA NRCS SSURGO
- 469 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 1.5 miles outFederal environmental registers
- Kingfisher County's boundary and the 574,779 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~230-day seasonGrowable Ground crop-matching engine
- Kingfisher County sitting wholly inside the Central Great PlainsUS EPA Level III Ecoregions
- Open occurrence records documented in Kingfisher County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Kingfisher County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Oklahoma grower plans around — written at state scale, so they stay on the state guidefrom Oklahoma
What this page can’t tell you
- How the season shifts across Kingfisher County — the ~230 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 Kingfisher County's 574,779 acreswhy one lot differs from the next →
- Which of those 469 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 Kingfisher Countyread your own land →