Grainola, 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.
The conditions favor cabbage, hazelnut, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Grainola, 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 Grainola 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 Grainola — soil, climate, flood, and parcel records. How we handle your address.
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Grainola — the short answer
Grainola, Oklahoma: USDA zone 7a, about 227 days between hard freezes, across 154 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- 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
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 154 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 Grainola's average, not your lot's — a low corner or a tree line moves it. Against Grainola's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grainola
Each reading below is measured for Grainola itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGrainola runs about 227 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
MeasuredGrainola 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 Grainola is in
Grainola sits in the Flint Hills — EPA Level III, inside the wider Great Plains. That is read at Grainola's own centroid, and it is not what its county reads: Osage County is mostly Cross Timbers. The wider page above you is answering a different question about different ground.
What Grows in Grainola
Every plant below cleared Grainola's own zone 7a and its 227-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Grainola?
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 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (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 Grainola
Closest first, within ~10 miles of Grainola. Listing isn't leaking, and distance isn't exposure.
- Grainola Farm SupplyUnderground Storage Tanks · 900 ft
- 28N-06E-01 ABD 1 MW10Nitrate · 2.5 mi
- Oklahoma Payne, IncUnderground Storage Tanks · 3.3 mi
- Marrs Drilling Co., IncUnderground Storage Tanks · 3.4 mi
- 34S 07E 22CCC 01Nitrate · 9.2 mi
- 35S 08E 03CBC 01Nitrate · 9.5 mi
Measured from Grainola'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 Grainola.
Severity Distribution
within ~10 miles of Grainola
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
Check your specific parcel in Grainola
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 Grainola average
Your land is one point inside Grainola
Everything above resolves to Grainola as a whole — one PHZM band and one 28°F frost record, read across 154 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 Grainola Average
Grainola Average
- ●USDA Zones 7a, averaged across Grainola
- ●One soil character for all of Grainola
- ●Frost dates read at Grainola's scale: Mar 27 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Grainola's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grainola
Pull a site-specific report for your exact address in Grainola, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grainola averages can't show:
We read public map data around Grainola — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grainola average
How we know this about Grainola
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 Grainola’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 Grainola
When does frost risk typically end in Grainola?
The last hard freeze (28°F) in Grainola typically lands around Mar 27, 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 17.
When is the first frost in Grainola?
The first hard freeze (28°F) in Grainola 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 227 days after the spring freeze cleared.
How long is the growing season in Grainola?
Measured between 28°F hard freezes, Grainola sees about 227 frost-free days — roughly Mar 27 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 26, about 192 days.
Is the soil safe to grow vegetables in Grainola?
The federal record around Grainola is light — 9 documented sites across the 9 federal source types we checked, mostly Nitrate entries (6), the nearest Underground Storage Tanks record about 0.2 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 Grainola?
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 Grainola's scale — its 7a band and its 227-day season. Your yard writes its own version of Grainola'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 Grainola’s own scale
6 of the readings below were taken at Grainola's own scale — its own ~227-day season between 28°F freezes, the 154 acres it covers and 9 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Grainola's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Grainola's own 28°F hard-freeze dates, about Mar 27 and Nov 9 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 9 documented contamination sites on the federal record near Grainola, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Grainola's boundary and the 154 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- Grainola sits in the Flint Hills — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Grainola's 154 acres read through its county's SSURGO summaryfrom Osage County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Osage 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 Osage County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Grainola's 154 acreswhy one lot differs from the next →
- Which side of Grainola you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 154 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Grainola-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaGrainola sits outside our named growing regions, so Oklahoma as a whole is its closest context here.