Haskell County, in Oklahoma, sits in USDA hardiness zone 7b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, prickly pear, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Haskell County holds more than one microclimate.
Soils and elevations shift across Haskell 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 Haskell County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Haskell County — the short answer
Haskell County, Oklahoma: USDA zone 7b, about 239 days between hard freezes, across 369K acres.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 18
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~239
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 369K 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 Haskell County's average, not your lot's — a low corner or a tree line moves it. Against Haskell County's 239-day season, see what your own ground reads.
Heat and winter chill in Haskell County
Across a year, Haskell County accumulates about 4,819 growing degree days above 50°F, about 99 more than the middle Oklahoma county — ahead of 47 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 1,820 hours below 45°F, 99 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 Haskell County
Across Haskell County, the ground is predominantly Alfisols, where Carnasaw, Stigler, and Linker are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 5.3–5.6, strongly acidic. Rainfall drains through hydrologic group D soils.
Soil order
Alfisols
Drainage
Well drained
Prime farmland
28%
Hydric soils
3%
Soil still varies lot by lot — soil types explained.
How the ground varies across Haskell County
The USDA soil survey maps 51% of Haskell County as well drained — but another 41% drains differently: 37% moderately well drained, 2% very poorly drained.
Carnasaw is the most extensive named soil at 13% of mapped acres, then Stigler (12%) and Linker (10%).
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 Haskell County
Each reading below is measured for Haskell 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 Haskell 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 Haskell County runs about pH 5.3–5.6, 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
MeasuredHaskell County runs about 239 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
MeasuredHaskell 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 Haskell County is in
Haskell County sits in the Arkansas Valley — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Haskell County
We scored all 1,086 plants against Haskell County's own USDA zone 7b and its own 239-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 Haskell County?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 18 (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. 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 Haskell County
- monarch butterfly2 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Haskell County
USGS estimates 15,665 lb of 2,4-d on Haskell County farmland in 2019, its largest by weight, ahead of Triclopyr (5,639 lb) and Dicamba (1,082 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 Haskell County — and how to grow with it.
We checked the federal record across Haskell County — 121 documented sites across 3 of the 9 source types we track.
The most significant on record: 6 brownfield sites. Former commercial or industrial land where legacy contamination may persist.
The federal record across Haskell County is a modest one — a typical footprint for a growing area. Nothing here calls for alarm; it's worth knowing which recorded sites sit closest to where you grow, and each one on the map carries its type and location. If one turns out to be a near neighbor, a one-time soil test settles the question.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Haskell County
Closest first, across Haskell County. Listing isn't leaking, and distance isn't exposure.
- Stigler OperatingUnderground Storage Tanks · 1.2 mi
- Okla Dept Of TransportationUnderground Storage Tanks · 1.3 mi
- Vaughn MotorsUnderground Storage Tanks · 1.3 mi
- Cookson Hills Electric CoopUnderground Storage Tanks · 1.3 mi
- Main Street Service StationUnderground Storage Tanks · 1.4 mi
- ROSEWOOD INDUSTRIES, INC.Brownfields · 1.4 mi
- Casey's General Store #3739Underground Storage Tanks · 1.5 mi
- Total ExpressUnderground Storage Tanks · 1.5 mi
- Stigler Service StationUnderground Storage Tanks · 1.6 mi
- E-Z Mart #4425Underground Storage Tanks · 1.7 mi
- WALMART SUPERCENTER #276Brownfields · 1.7 mi
- Swbt R64160 Stigler CoUnderground Storage Tanks · 1.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Haskell 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 Haskell County.
Severity Distribution
across Haskell County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Haskell County, Nitrate runs higher than the national average — 58 sites across Haskell County. 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 Haskell 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 Haskell County average
Your land is one point inside Haskell County
Everything above resolves to Haskell County as a whole — one PHZM band and one county frost record, read across 369K 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 Haskell County Average
Haskell County Average
- ●USDA Zones 7b, averaged across Haskell County
- ●One soil character for all of Haskell County
- ●Frost dates read at Haskell County's scale: Mar 18 to Nov 12
YOUR Parcel
- ✓Your exact zone, not Haskell County's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Haskell County
Pull a site-specific report for your exact address in Haskell County, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Haskell County averages can't show:
We read public map data around Haskell County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Haskell County average
How we know this about Haskell 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 Haskell County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Haskell County
When does frost risk typically end in Haskell County?
The last hard freeze (28°F) in Haskell County typically lands around Mar 18, 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 8.
How long is the growing season in Haskell County?
Measured between 28°F hard freezes, Haskell County sees about 239 frost-free days — roughly Mar 18 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 8 to Oct 29, about 204 days.
Is the soil safe to grow vegetables in Haskell County?
The federal record around Haskell County shows 121 documented sites, mostly Nitrate entries (58), the nearest Underground Storage Tanks record about 1.2 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.
Everything above is measured at Haskell County's scale — its 7b band and its 239-day season. Your yard writes its own version of Haskell 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 Haskell County’s own scale
9 of the readings below were taken at Haskell County's own scale — its own ~239-day span between 28°F freezes, the 3 most extensive soil series mapped here and 121 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Haskell County's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Haskell County's own 28°F hard-freeze dates and its ~239-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Haskell CountyUSDA NRCS SSURGO
- 121 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record about 1.2 miles outFederal environmental registers
- Haskell County's boundary and the 369,104 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~239-day seasonGrowable Ground crop-matching engine
- Haskell County sitting wholly inside the Arkansas ValleyUS EPA Level III Ecoregions
- Open occurrence records documented in Haskell County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Haskell 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 Haskell County — the ~239 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 Haskell County's 369,104 acreswhy one lot differs from the next →
- Which of those 121 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 Haskell Countyread your own land →