Sequoyah County, in Oklahoma, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
These conditions suit cabbage, prickly pear, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Sequoyah County holds more than one microclimate.
Soils and elevations shift across Sequoyah 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 Sequoyah County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Sequoyah County — the short answer
Sequoyah County, Oklahoma: USDA zone 7b, about 246 days between hard freezes, across 431K acres.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 16
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 17
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~246
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 431K 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 Sequoyah County's average, not your lot's — a low corner or a tree line moves it. Against Sequoyah County's 246-day season, see what your own ground reads.
Heat and winter chill in Sequoyah County
Across a year, Sequoyah County accumulates about 4,748 growing degree days above 50°F, about 28 more than the middle Oklahoma county — ahead of 39 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 1,832 hours below 45°F, 87 fewer 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 Sequoyah County
Across Sequoyah County, the ground is predominantly Ultisols, where Linker, Hector, and Enders are the most extensive named soil series. The soil is generally well drained with a stony fine sandy loam surface. Topsoil pH runs about 5.6–5.8, moderately acidic. Rainfall drains through hydrologic group D soils.
Soil order
Ultisols
Drainage
Well drained
Prime farmland
20%
Hydric soils
6%
Soil still varies lot by lot — soil types explained.
How the ground varies across Sequoyah County
The USDA soil survey maps 66% of Sequoyah County as well drained — but another 29% drains differently: 12% moderately well drained, 11% somewhat poorly drained.
Linker is the most extensive named soil at 24% of mapped acres, then Hector (22%) and Enders (17%).
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 Sequoyah County
Each reading below is measured for Sequoyah 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 Sequoyah County are well drained, in hydrologic group D — 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 Sequoyah County runs about pH 5.6–5.8, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredSequoyah County runs about 246 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
MeasuredSequoyah 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 Sequoyah County is in
Sequoyah County spans 2 EPA Level III ecoregions — Boston Mountains (54%) and Arkansas Valley (46%). 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 Sequoyah County
We scored all 1,086 plants against Sequoyah County's own USDA zone 7b and its own 246-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 Sequoyah County?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 17 — 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.
Documented around Sequoyah County
- monarch butterfly1 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Sequoyah County
USGS estimates 19,363 lb of 2,4-d on Sequoyah County farmland in 2019, its largest by weight, ahead of Glyphosate (16,214 lb) and Metolachlor & Metolachlor-s (12,527 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 Sequoyah County — and how to grow with it.
We checked the federal record across Sequoyah County — 167 documented sites across 6 of the 9 source types we track.
The most significant on record: 2 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 Sequoyah 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 Sequoyah County
Closest first, across Sequoyah County. Listing isn't leaking, and distance isn't exposure.
- SALLISAWPFAS · 2000 ft
- North Big DUnderground Storage Tanks · 1.2 mi
- Triple S Petroleum Jc ShockleyUnderground Storage Tanks · 1.3 mi
- Sparks Corner StoreUnderground Storage Tanks · 1.3 mi
- Robert S Kerr L&D #15Underground Storage Tanks · 1.8 mi
- ROBERT S KERR LOCK AND DAM 15Superfund · 2.4 mi
- ROBERT S KERR LOCK AND DAM 15Brownfields · 2.4 mi
- RS KERR MARINA TERMINALBrownfields · 2.4 mi
- PENCE TOWING SVCBrownfields · 3.1 mi
- Long's DonutsUnderground Storage Tanks · 3.2 mi
- Akins Grocery & FeedUnderground Storage Tanks · 3.2 mi
- Best Mart #3Underground Storage Tanks · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sequoyah 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 Sequoyah County.
Total Sites
167
across Sequoyah County
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
across Sequoyah County
Severity Distribution
across Sequoyah County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sequoyah County, Underground Storage Tanks runs higher than the national average — 130 sites across Sequoyah County. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Sequoyah 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 Sequoyah County average
Your land is one point inside Sequoyah County
Everything above resolves to Sequoyah County as a whole — one PHZM band and one county frost record, read across 431K 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 Sequoyah County Average
Sequoyah County Average
- ●USDA Zones 7b, averaged across Sequoyah County
- ●One soil character for all of Sequoyah County
- ●Frost dates read at Sequoyah County's scale: Mar 16 to Nov 17
YOUR Parcel
- ✓Your exact zone, not Sequoyah County's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Sequoyah County
Pull a site-specific report for your exact address in Sequoyah County, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sequoyah County averages can't show:
We read public map data around Sequoyah County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sequoyah County average
How we know this about Sequoyah 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 Sequoyah County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Sequoyah County
When does frost risk typically end in Sequoyah County?
The last hard freeze (28°F) in Sequoyah County typically lands around Mar 16, 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 6.
How long is the growing season in Sequoyah County?
Measured between 28°F hard freezes, Sequoyah County sees about 246 frost-free days — roughly Mar 16 through Nov 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 6 to Nov 3, about 211 days.
Is the soil safe to grow vegetables in Sequoyah County?
The federal record around Sequoyah County is a meaningful one — 167 documented sites, mostly Underground Storage Tanks entries (130), the nearest PFAS record about 0.4 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 Sequoyah County's scale — its 7b band and its 246-day season. Your yard writes its own version of Sequoyah 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 Sequoyah County’s own scale
9 of the readings below were taken at Sequoyah County's own scale — its own ~246-day span between 28°F freezes, the 3 most extensive soil series mapped here and 167 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Sequoyah County's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Sequoyah County's own 28°F hard-freeze dates and its ~246-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Sequoyah CountyUSDA NRCS SSURGO
- 167 documented contamination sites inside the county boundary, distance-sorted from its center — the closest PFAS record about 0.4 miles outFederal environmental registers
- Sequoyah County's boundary and the 431,088 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~246-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Sequoyah County spans, Boston Mountains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Sequoyah County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Sequoyah 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 Sequoyah County — the ~246 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 Sequoyah County's 431,088 acreswhy one lot differs from the next →
- Which of those 167 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 Sequoyah Countyread your own land →