Canadian County, in Oklahoma, sits in USDA hardiness zone 7b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, prickly pear, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Canadian County holds more than one microclimate.
Soils and elevations shift across Canadian 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 Canadian County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Canadian County — the short answer
Canadian County, Oklahoma: USDA zone 7b, about 235 days between hard freezes, across 574K acres.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 22
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~235
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 574K 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 7b is Canadian County's average, not your lot's — a low corner or a tree line moves it. Against Canadian County's 235-day season, see what your own ground reads.
Heat and winter chill in Canadian County
Across a year, Canadian County accumulates about 4,617 growing degree days above 50°F, about 103 fewer than the middle Oklahoma county — ahead of 26 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 2,004 hours below 45°F, 85 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 Canadian County
Across Canadian County, the ground is predominantly Mollisols, where Norge, Bethany, and Port are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 6.0–7.0, slightly acidic. Rainfall drains through hydrologic group B soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
71%
Hydric soils
0%
Soil still varies lot by lot — soil types explained.
How the ground varies across Canadian County
The USDA soil survey maps 90% of Canadian County as well drained — but another 8% drains differently: 4% somewhat poorly drained, 3% moderately well drained.
Norge is the most extensive named soil at 18% of mapped acres, then Bethany (7%) and Port (7%).
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 Canadian County
Each reading below is measured for Canadian 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 Canadian County are well drained, in hydrologic group B — 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 Canadian County runs about pH 6.0–7.0, 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
MeasuredCanadian County runs about 235 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
MeasuredCanadian County sits in USDA hardiness zone 7b.
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 Canadian County is in
Canadian County spans 2 EPA Level III ecoregions — Central Great Plains (93%) and Cross Timbers (7%). 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 Canadian County
We scored all 1,086 plants against Canadian County's own USDA zone 7b and its own 235-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 Canadian County?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 12 — 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.
Documented around Canadian County
- monarch butterfly12 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Canadian County
USGS estimates 45,028 lb of 2,4-d on Canadian County farmland in 2019, its largest by weight, ahead of Glyphosate (33,245 lb) and Triclopyr (17,498 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 Canadian County — and how to grow with it.
We checked the federal record across Canadian County — 634 documented sites across 7 of the 9 source types we track.
The most significant on record: 4 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 Canadian 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 Canadian County
Closest first, across Canadian County. Listing isn't leaking, and distance isn't exposure.
- GERBER COLLISION & GLASS - EL RENOBrownfields · 2400 ft
- Schwarz Oil CompanyUnderground Storage Tanks · 2500 ft
- Schwarz Oil Co Inc BulkUnderground Storage Tanks · 0.5 mi
- P & L ShortstopUnderground Storage Tanks · 0.5 mi
- Sunset TexacoUnderground Storage Tanks · 0.5 mi
- Oklahoma Dept Of TransportationUnderground Storage Tanks · 0.6 mi
- Jenks Simmons FieldhouseUnderground Storage Tanks · 0.8 mi
- Municipal ShopUnderground Storage Tanks · 0.8 mi
- Vickie's C-StoreUnderground Storage Tanks · 0.9 mi
- Schwarz Oil Co., Inc.Underground Storage Tanks · 1.0 mi
- Carnott's Inc.Underground Storage Tanks · 1.0 mi
- Mini MaxUnderground Storage Tanks · 1.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Canadian 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 Canadian County.
Total Sites
634
across Canadian County
Risk Level
Elevated
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
across Canadian County
Severity Distribution
across Canadian County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Canadian County, two things run higher than the national average across Canadian County — CAFO (8 sites) and Nitrate (206 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Canadian 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 Canadian County average
Your land is one point inside Canadian County
Everything above resolves to Canadian County as a whole — one PHZM band and one county frost record, read across 574K 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 Canadian County Average
Canadian County Average
- ●USDA Zones 7b, averaged across Canadian County
- ●One soil character for all of Canadian County
- ●Frost dates read at Canadian County's scale: Mar 22 to Nov 12
YOUR Parcel
- ✓Your exact zone, not Canadian County's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Canadian County
Pull a site-specific report for your exact address in Canadian County, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Canadian County averages can't show:
We read public map data around Canadian County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Canadian County average
How we know this about Canadian 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 Canadian County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Canadian County
When does frost risk typically end in Canadian County?
The last hard freeze (28°F) in Canadian County typically lands around Mar 22, 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 12.
How long is the growing season in Canadian County?
Measured between 28°F hard freezes, Canadian County sees about 235 frost-free days — roughly Mar 22 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 12 to Oct 29, about 200 days.
Is the soil safe to grow vegetables in Canadian County?
The federal record around Canadian County is a meaningful one — 634 documented sites, mostly Underground Storage Tanks entries (283), the nearest Brownfields record about 0.5 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 Canadian County's scale — its 7b band and its 235-day season. Your yard writes its own version of Canadian 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 Canadian County’s own scale
9 of the readings below were taken at Canadian County's own scale — its own ~235-day span between 28°F freezes, the 3 most extensive soil series mapped here and 634 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Canadian County's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Canadian County's own 28°F hard-freeze dates and its ~235-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Canadian CountyUSDA NRCS SSURGO
- 634 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 0.5 miles outFederal environmental registers
- Canadian County's boundary and the 573,810 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~235-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Canadian County spans, Central Great Plains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Canadian County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Canadian 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 Canadian County — the ~235 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 Canadian County's 573,810 acreswhy one lot differs from the next →
- Which of those 634 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 Canadian Countyread your own land →