Copan, 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.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Copan, 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 Copan 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 Copan — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Copan — the short answer
Copan, Oklahoma: USDA zone 7a, about 229 days between hard freezes, across 674 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~229
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 674 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 Copan's average, not your lot's — a low corner or a tree line moves it. Against Copan's 229-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Copan
Each reading below is measured for Copan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCopan runs about 229 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
MeasuredCopan 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 Copan is in
Copan sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Copan's own centroid rather than borrowed from Washington County.
What Grows in Copan
Every plant below cleared Copan's own zone 7a and its 229-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Copan?
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 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 9 — 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 Copan
Closest first, within ~10 miles of Copan. Listing isn't leaking, and distance isn't exposure.
- Phillips 66 Co #040075Underground Storage Tanks · 650 ft
- Phillips 66 Co #042886Underground Storage Tanks · 750 ft
- Washington County Road DeptUnderground Storage Tanks · 1300 ft
- Copan Handi MartUnderground Storage Tanks · 1400 ft
- Copan SchoolUnderground Storage Tanks · 1800 ft
- Copan Truck Stop Bob ChaneyUnderground Storage Tanks · 0.9 mi
- Copan Hulan Project OfficeUnderground Storage Tanks · 1.7 mi
- US ARMY COE COPAN PROJECT OFFICEBrownfields · 2.6 mi
- US ARMY COE HULAH PROJECT OFFICEBrownfields · 2.6 mi
- Burlington RrUnderground Storage Tanks · 3.4 mi
- Equity DrillingUnderground Storage Tanks · 5.0 mi
- DEWEY PUBLIC WORKS AUTHORITYPFAS · 5.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Copan'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 Copan.
Sources Checked
within ~10 miles of Copan
Severity Distribution
within ~10 miles of Copan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Copan, Superfund runs higher than the national average — 9 sites within ~10 miles of Copan. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Copan
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 Copan average
Your land is one point inside Copan
Everything above resolves to Copan as a whole — one PHZM band and one 28°F frost record, read across 674 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 Copan Average
Copan Average
- ●USDA Zones 7a, averaged across Copan
- ●One soil character for all of Copan
- ●Frost dates read at Copan's scale: Mar 25 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Copan's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Copan
Pull a site-specific report for your exact address in Copan, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Copan averages can't show:
We read public map data around Copan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Copan average
How we know this about Copan
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 Copan’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 Copan
When does frost risk typically end in Copan?
The last hard freeze (28°F) in Copan typically lands around Mar 25, 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 15.
When is the first frost in Copan?
The first hard freeze (28°F) in Copan typically arrives around Nov 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 26, so the watching starts about Oct 10 — about 229 days after the spring freeze cleared.
How long is the growing season in Copan?
Measured between 28°F hard freezes, Copan sees about 229 frost-free days — roughly Mar 25 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 15 to Oct 26, about 194 days.
Is the soil safe to grow vegetables in Copan?
The federal record around Copan is a meaningful one — 93 documented sites, mostly Underground Storage Tanks entries (53), the nearest Underground Storage Tanks record about 0.1 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 Copan?
From about Oct 10 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Copan's scale — its 7a band and its 229-day season. Your yard writes its own version of Copan'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 Copan’s own scale
6 of the readings below were taken at Copan's own scale — its own ~229-day season between 28°F freezes, the 674 acres it covers and 93 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Copan's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Copan's own 28°F hard-freeze dates, about Mar 25 and Nov 9 and the ~229-day span between themNOAA 1991–2020 Climate Normals
- 93 documented contamination sites on the federal record near Copan, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Copan's boundary and the 674 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~229-day seasonGrowable Ground crop-matching engine
- The ecoregion at Copan's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Copan's 674 acres read through its county's SSURGO summaryfrom Washington County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washington 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 Washington County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Copan's 674 acreswhy one lot differs from the next →
- Which side of Copan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 674 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 Copan-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaCopan sits outside our named growing regions, so Oklahoma as a whole is its closest context here.
Nearby growing guides