Fort Cobb, Oklahoma, sits in USDA hardiness zone 7b — a zone band wide enough that plant choice, not possibility, is the interesting question.
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.
Even in Fort Cobb, 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 Fort Cobb 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 Fort Cobb — soil, climate, flood, and parcel records. How we handle your address.
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Fort Cobb — the short answer
Fort Cobb, Oklahoma: USDA zone 7b, about 238 days between hard freezes, across 456 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~238
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 456 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 7b is Fort Cobb's average, not your lot's — a low corner or a tree line moves it. Against Fort Cobb's 238-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Fort Cobb
Each reading below is measured for Fort Cobb itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFort Cobb runs about 238 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
MeasuredFort Cobb 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 Fort Cobb is in
Fort Cobb sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Fort Cobb's own centroid rather than borrowed from Caddo County.
What Grows in Fort Cobb
Every plant below cleared Fort Cobb's own zone 7b and its 238-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Fort Cobb?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 13 — 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.
What's on the federal record near Fort Cobb
Closest first, within ~10 miles of Fort Cobb. Listing isn't leaking, and distance isn't exposure.
- 08N-12W-35 CBA 1Nitrate · 0.6 mi
- 07N-12W-02 CAD 1Nitrate · 0.8 mi
- Bird CageUnderground Storage Tanks · 1.0 mi
- CADDO-KIOWA VO-TECH CENTERBrownfields · 1.0 mi
- 07N-12W-02 DD 1Nitrate · 1.1 mi
- Ski-Boy EnterprisesUnderground Storage Tanks · 1.2 mi
- Tc's Total ServiceUnderground Storage Tanks · 1.2 mi
- Burtschi Enterprises/T-BirdsUnderground Storage Tanks · 1.2 mi
- Ft Cobb Public School Dist. I7Underground Storage Tanks · 1.2 mi
- Jarrett E. WalkerUnderground Storage Tanks · 1.3 mi
- Thrift Distributons Inc.Underground Storage Tanks · 1.3 mi
- Former Harris Fina StationUnderground Storage Tanks · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Fort Cobb'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 Fort Cobb.
Total Sites
162
within ~10 miles of Fort Cobb
Risk Level
Elevated
Highest-severity
7 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Fort Cobb
Severity Distribution
within ~10 miles of Fort Cobb
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Fort Cobb, two things run higher than the national average within ~10 miles of Fort Cobb — Superfund (7 sites) and Nitrate (104 sites). That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Fort Cobb
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 Fort Cobb average
Your land is one point inside Fort Cobb
Everything above resolves to Fort Cobb as a whole — one PHZM band and one 28°F frost record, read across 456 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 town 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 Fort Cobb Average
Fort Cobb Average
- ●USDA Zones 7b, averaged across Fort Cobb
- ●One soil character for all of Fort Cobb
- ●Frost dates read at Fort Cobb's scale: Mar 20 to Nov 13
YOUR Parcel
- ✓Your exact zone, not Fort Cobb's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Fort Cobb
Pull a site-specific report for your exact address in Fort Cobb, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Fort Cobb averages can't show:
We read public map data around Fort Cobb — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Fort Cobb average
How we know this about Fort Cobb
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Fort Cobb’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 town grain anywhere on this page — there is no town-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 Fort Cobb
When does frost risk typically end in Fort Cobb?
The last hard freeze (28°F) in Fort Cobb typically lands around Mar 20, 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 10.
When is the first frost in Fort Cobb?
The first hard freeze (28°F) in Fort Cobb typically arrives around Nov 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 30, so the watching starts about Oct 14 — about 238 days after the spring freeze cleared.
How long is the growing season in Fort Cobb?
Measured between 28°F hard freezes, Fort Cobb sees about 238 frost-free days — roughly Mar 20 through Nov 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 10 to Oct 30, about 203 days.
Is the soil safe to grow vegetables in Fort Cobb?
The federal record around Fort Cobb is a meaningful one — 162 documented sites, mostly Nitrate entries (104), the nearest Nitrate record about 0.6 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.
How do I protect my plants from frost in Fort Cobb?
From about Oct 14 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 Nov 13 (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 Nov 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Fort Cobb's scale — its 7b band and its 238-day season. Your yard writes its own version of Fort Cobb'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 Fort Cobb’s own scale
6 of the readings below were taken at Fort Cobb's own scale — its own ~238-day season between 28°F freezes, the 456 acres it covers and 162 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Fort Cobb's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Fort Cobb's own 28°F hard-freeze dates, about Mar 20 and Nov 13 and the ~238-day span between themNOAA 1991–2020 Climate Normals
- 162 documented contamination sites on the federal record near Fort Cobb, the closest Nitrate record about 0.6 miles out from the town centreFederal environmental registers
- Fort Cobb's boundary and the 456 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~238-day seasonGrowable Ground crop-matching engine
- The ecoregion at Fort Cobb's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Fort Cobb's 456 acres read through its county's SSURGO summaryfrom Caddo County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Caddo County
- The growing challenges every Oklahoma grower plans around — written at state scale, so they stay on the state guidefrom Oklahoma
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Caddo County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Fort Cobb's 456 acreswhy one lot differs from the next →
- Which side of Fort Cobb you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 456 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.6 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 Fort Cobb-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaFort Cobb sits outside our named growing regions, so Oklahoma as a whole is its closest context here.