Okmulgee, Oklahoma, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, prickly pear, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Okmulgee, 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 Okmulgee 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 Okmulgee — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Okmulgee — the short answer
Okmulgee, Oklahoma: USDA zone 7b, about 237 days between hard freezes, across 11K acres of city.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 11K 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 Okmulgee's average, not your lot's — a low corner or a tree line moves it. Against Okmulgee's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Okmulgee
Each reading below is measured for Okmulgee itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOkmulgee runs about 237 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
MeasuredOkmulgee 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 Okmulgee is in
Okmulgee sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Okmulgee's own centroid, and it is not what its county reads: Okmulgee County is mostly Cross Timbers. The wider page above you is answering a different question about different ground.
What Grows in Okmulgee
Every plant below cleared Okmulgee's own zone 7b and its 237-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Okmulgee?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — 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 Okmulgee
Closest first, within ~10 miles of Okmulgee. Listing isn't leaking, and distance isn't exposure.
- Okmulgee Ready Mix Concrete CoUnderground Storage Tanks · 550 ft
- One Quick StopUnderground Storage Tanks · 1800 ft
- Gilbert's SunocoUnderground Storage Tanks · 1900 ft
- Okmulgee ShellUnderground Storage Tanks · 2000 ft
- Little StoreUnderground Storage Tanks · 2200 ft
- O'REILLY AUTO PART STORE189Brownfields · 2200 ft
- Circle K #2704019Underground Storage Tanks · 2300 ft
- J & J Services StationUnderground Storage Tanks · 2300 ft
- USARC GEORGE D. SWANSONBrownfields · 2500 ft
- Git N Go #38Underground Storage Tanks · 0.5 mi
- Gas N Shop 30Underground Storage Tanks · 0.5 mi
- OKLAHOMA STATE UNIV INSTITUTE OF TECHNOLOGYBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Okmulgee'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 Okmulgee.
Total Sites
141
within ~10 miles of Okmulgee
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Okmulgee
Severity Distribution
within ~10 miles of Okmulgee
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Okmulgee, two things run higher than the national average within ~10 miles of Okmulgee — Superfund (3 sites) and Underground Storage Tanks (105 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.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Okmulgee
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 Okmulgee average
Your land is one point inside Okmulgee
Everything above resolves to Okmulgee as a whole — one PHZM band and one 28°F frost record, read across 11K 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 city 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 Okmulgee Average
Okmulgee Average
- ●USDA Zones 7b, averaged across Okmulgee
- ●One soil character for all of Okmulgee
- ●Frost dates read at Okmulgee's scale: Mar 19 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Okmulgee's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Okmulgee
Pull a site-specific report for your exact address in Okmulgee, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Okmulgee averages can't show:
We read public map data around Okmulgee — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Okmulgee average
How we know this about Okmulgee
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Okmulgee’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 city grain anywhere on this page — there is no city-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 Okmulgee
When does frost risk typically end in Okmulgee?
The last hard freeze (28°F) in Okmulgee typically lands around Mar 19, 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 9.
When is the first frost in Okmulgee?
The first hard freeze (28°F) in Okmulgee typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 237 days after the spring freeze cleared.
How long is the growing season in Okmulgee?
Measured between 28°F hard freezes, Okmulgee sees about 237 frost-free days — roughly Mar 19 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Oct 28, about 202 days.
Is the soil safe to grow vegetables in Okmulgee?
The federal record around Okmulgee is a meaningful one — 141 documented sites, mostly Underground Storage Tanks entries (105), 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 Okmulgee?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Okmulgee's scale — its 7b band and its 237-day season. Your yard writes its own version of Okmulgee'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 Okmulgee’s own scale
6 of the readings below were taken at Okmulgee's own scale — its own ~237-day season between 28°F freezes, the 11,019 acres it covers and 141 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Okmulgee's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Okmulgee's own 28°F hard-freeze dates, about Mar 19 and Nov 11 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 141 documented contamination sites on the federal record near Okmulgee, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Okmulgee's boundary and the 11,019 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~237-day seasonGrowable Ground crop-matching engine
- Okmulgee sits in the Central Irregular Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Okmulgee's 11,019 acres read through its county's SSURGO summaryfrom Okmulgee County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Okmulgee 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 Okmulgee County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Okmulgee's 11,019 acreswhy one lot differs from the next →
- Which side of Okmulgee you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 11,019 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 Okmulgee-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaOkmulgee sits outside our named growing regions, so Oklahoma as a whole is its closest context here.