Fort Supply, Oklahoma, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Well-matched crops include cabbage, hazelnut, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Fort Supply, 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 Supply 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 Supply — soil, climate, flood, and parcel records. How we handle your address.
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Fort Supply — the short answer
Fort Supply, Oklahoma: USDA zone 7a, about 211 days between hard freezes, across 138 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~211
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 138 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 7a is Fort Supply's average, not your lot's — a low corner or a tree line moves it. Against Fort Supply's 211-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Fort Supply
Each reading below is measured for Fort Supply itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFort Supply runs about 211 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 Supply 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 Fort Supply is in
Fort Supply sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Fort Supply's own centroid rather than borrowed from Woodward County.
What Grows in Fort Supply
Every plant below cleared Fort Supply's own zone 7a and its 211-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Fort Supply?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Fort Supply
Closest first, within ~10 miles of Fort Supply. Listing isn't leaking, and distance isn't exposure.
- Former Ft Supply TexacoUnderground Storage Tanks · 750 ft
- Big D's Country StoreUnderground Storage Tanks · 800 ft
- Steuart's Country StoreUnderground Storage Tanks · 800 ft
- Don's SinclairUnderground Storage Tanks · 850 ft
- Ft Supply C OUnderground Storage Tanks · 850 ft
- Fort Supply Independent School Dist # 5Underground Storage Tanks · 1100 ft
- Bill MeadowsUnderground Storage Tanks · 1500 ft
- Western State HospitalUnderground Storage Tanks · 1.1 mi
- Ft Supply Lake Project OfficeUnderground Storage Tanks · 1.2 mi
- 24N-22W-10 CAB 1Nitrate · 1.5 mi
- 24N-22W-06 AC 1Nitrate · 1.5 mi
- 24N-22W-15 BBA 1Nitrate · 1.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Fort Supply'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 Supply.
Total Sites
37
within ~10 miles of Fort Supply
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Fort Supply
Severity Distribution
within ~10 miles of Fort Supply
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Fort Supply, Nitrate runs higher than the national average — 22 sites within ~10 miles of Fort Supply. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Fort Supply
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 Supply average
Your land is one point inside Fort Supply
Everything above resolves to Fort Supply as a whole — one PHZM band and one 28°F frost record, read across 138 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 Supply Average
Fort Supply Average
- ●USDA Zones 7a, averaged across Fort Supply
- ●One soil character for all of Fort Supply
- ●Frost dates read at Fort Supply's scale: Apr 4 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Fort Supply's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Fort Supply
Pull a site-specific report for your exact address in Fort Supply, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Fort Supply averages can't show:
We read public map data around Fort Supply — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Fort Supply average
How we know this about Fort Supply
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 Supply’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 Supply
When does frost risk typically end in Fort Supply?
The last hard freeze (28°F) in Fort Supply typically lands around Apr 4, 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 25.
When is the first frost in Fort Supply?
The first hard freeze (28°F) in Fort Supply typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 211 days after the spring freeze cleared.
How long is the growing season in Fort Supply?
Measured between 28°F hard freezes, Fort Supply sees about 211 frost-free days — roughly Apr 4 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 18, about 176 days.
Is the soil safe to grow vegetables in Fort Supply?
The federal record around Fort Supply is light — 37 documented sites across the 9 federal source types we checked, mostly Nitrate entries (22), the nearest Underground Storage Tanks record about 0.1 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Fort Supply?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Fort Supply's scale — its 7a band and its 211-day season. Your yard writes its own version of Fort Supply'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 Supply’s own scale
6 of the readings below were taken at Fort Supply's own scale — its own ~211-day season between 28°F freezes, the 138 acres it covers and 37 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Fort Supply's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Fort Supply's own 28°F hard-freeze dates, about Apr 4 and Nov 1 and the ~211-day span between themNOAA 1991–2020 Climate Normals
- 37 documented contamination sites on the federal record near Fort Supply, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Fort Supply's boundary and the 138 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~211-day seasonGrowable Ground crop-matching engine
- The ecoregion at Fort Supply'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 Supply's 138 acres read through its county's SSURGO summaryfrom Woodward County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Woodward 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 Woodward County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Fort Supply's 138 acreswhy one lot differs from the next →
- Which side of Fort Supply you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 138 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Supply-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaFort Supply sits outside our named growing regions, so Oklahoma as a whole is its closest context here.