Quinlan, Oklahoma, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Reliable performers under these conditions include cabbage, hazelnut, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Quinlan, 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 Quinlan 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 Quinlan — soil, climate, flood, and parcel records. How we handle your address.
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Quinlan — the short answer
Quinlan, Oklahoma: USDA zone 7a, about 218 days between hard freezes, across 177 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~218
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 177 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 Quinlan's average, not your lot's — a low corner or a tree line moves it. Against Quinlan's 218-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Quinlan
Each reading below is measured for Quinlan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredQuinlan runs about 218 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
MeasuredQuinlan 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 Quinlan is in
Quinlan sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Quinlan's own centroid rather than borrowed from Woodward County.
What Grows in Quinlan
Every plant below cleared Quinlan's own zone 7a and its 218-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Quinlan?
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 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — 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 Quinlan
Closest first, within ~10 miles of Quinlan. Listing isn't leaking, and distance isn't exposure.
- 23N-18W-22 CDD 1Nitrate · 3.4 mi
- 23N-17W-08 ABB 1Nitrate · 4.7 mi
- 23N-18W-19 DDD 1Nitrate · 6.2 mi
- Anr Pipeline Co/Mooreland Sta.Underground Storage Tanks · 6.4 mi
- ANR PIPELINE CO/MOORELAND STABrownfields · 6.5 mi
- Fac. Name: Nursery 3, Well No. 66Nitrate · 6.6 mi
- Fac. Name: Nursery 3, Well No. 93Nitrate · 6.6 mi
- Fac. Name: Nursery 2, Well No. 94Nitrate · 6.6 mi
- Fac. Name: Nursery 2, Well No. 63Nitrate · 6.6 mi
- Fac. Name: Nursery 3, Well No. 92Nitrate · 6.7 mi
- Fac. Name: Nursery 2, Well No. 95Nitrate · 6.7 mi
- Fac. Name: Nursery 3, Well No. 64Nitrate · 6.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Quinlan'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 Quinlan.
Total Sites
218
within ~10 miles of Quinlan
Risk Level
Elevated
Highest-severity
1 mining site (prospects, none worked)
Sources Checked
within ~10 miles of Quinlan
Severity Distribution
within ~10 miles of Quinlan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Quinlan, Nitrate runs higher than the national average — 200 sites within ~10 miles of Quinlan. 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 Quinlan
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 Quinlan average
Your land is one point inside Quinlan
Everything above resolves to Quinlan as a whole — one PHZM band and one 28°F frost record, read across 177 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 Quinlan Average
Quinlan Average
- ●USDA Zones 7a, averaged across Quinlan
- ●One soil character for all of Quinlan
- ●Frost dates read at Quinlan's scale: Apr 1 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Quinlan's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Quinlan
Pull a site-specific report for your exact address in Quinlan, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Quinlan averages can't show:
We read public map data around Quinlan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Quinlan average
How we know this about Quinlan
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 Quinlan’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 Quinlan
When does frost risk typically end in Quinlan?
The last hard freeze (28°F) in Quinlan typically lands around Apr 1, 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 22.
When is the first frost in Quinlan?
The first hard freeze (28°F) in Quinlan typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 218 days after the spring freeze cleared.
How long is the growing season in Quinlan?
Measured between 28°F hard freezes, Quinlan sees about 218 frost-free days — roughly Apr 1 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 22, about 183 days.
Is the soil safe to grow vegetables in Quinlan?
The federal record around Quinlan is a meaningful one — 218 documented sites, mostly Nitrate entries (200), the nearest Nitrate record about 3.4 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.
How do I protect my plants from frost in Quinlan?
From about Oct 6 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Quinlan's scale — its 7a band and its 218-day season. Your yard writes its own version of Quinlan'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 Quinlan’s own scale
6 of the readings below were taken at Quinlan's own scale — its own ~218-day season between 28°F freezes, the 177 acres it covers and 218 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Quinlan's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Quinlan's own 28°F hard-freeze dates, about Apr 1 and Nov 5 and the ~218-day span between themNOAA 1991–2020 Climate Normals
- 218 documented contamination sites on the federal record near Quinlan, the closest Nitrate record about 3.4 miles out from the town centreFederal environmental registers
- Quinlan's boundary and the 177 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~218-day seasonGrowable Ground crop-matching engine
- The ecoregion at Quinlan's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Quinlan's 177 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 Quinlan's 177 acreswhy one lot differs from the next →
- Which side of Quinlan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 177 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 3.4 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 Quinlan-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaQuinlan sits outside our named growing regions, so Oklahoma as a whole is its closest context here.