Jennings, 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 Jennings, 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 Jennings 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 Jennings — soil, climate, flood, and parcel records. How we handle your address.
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Jennings — the short answer
Jennings, Oklahoma: USDA zone 7a, about 235 days between hard freezes, across 353 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~235
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 353 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 Jennings's average, not your lot's — a low corner or a tree line moves it. Against Jennings's 235-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Jennings
Each reading below is measured for Jennings itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredJennings runs about 235 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
MeasuredJennings 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 Jennings is in
Jennings sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Jennings's own centroid rather than borrowed from Pawnee County.
What Grows in Jennings
Every plant below cleared Jennings's own zone 7a and its 235-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Jennings?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Jennings
Closest first, within ~10 miles of Jennings. Listing isn't leaking, and distance isn't exposure.
- Jennings SchoolUnderground Storage Tanks · 400 ft
- M & M Dozer & Oilfield ServiceUnderground Storage Tanks · 600 ft
- Highway 99 Quick StopUnderground Storage Tanks · 1600 ft
- DAVCO FAB INCBrownfields · 1700 ft
- 19N-07E-03 CDD 1Nitrate · 2.4 mi
- Joe'sUnderground Storage Tanks · 2.9 mi
- Hallett Race StopUnderground Storage Tanks · 3.4 mi
- Fleming's Gibble GasUnderground Storage Tanks · 3.5 mi
- OVERHOLT TRUCKING SITESuperfund · 4.2 mi
- Terlton Elementary SchoolUnderground Storage Tanks · 4.5 mi
- Barnes Oil CompanyUnderground Storage Tanks · 5.3 mi
- Robert Tyler FarmUnderground Storage Tanks · 5.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Jennings'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 Jennings.
Total Sites
48
within ~10 miles of Jennings
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Jennings
Severity Distribution
within ~10 miles of Jennings
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jennings, Underground Storage Tanks runs higher than the national average — 33 sites within ~10 miles of Jennings. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Jennings
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 Jennings average
Your land is one point inside Jennings
Everything above resolves to Jennings as a whole — one PHZM band and one 28°F frost record, read across 353 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 Jennings Average
Jennings Average
- ●USDA Zones 7a, averaged across Jennings
- ●One soil character for all of Jennings
- ●Frost dates read at Jennings's scale: Mar 20 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Jennings's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Jennings
Pull a site-specific report for your exact address in Jennings, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jennings averages can't show:
We read public map data around Jennings — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jennings average
How we know this about Jennings
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 Jennings’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 Jennings
When does frost risk typically end in Jennings?
The last hard freeze (28°F) in Jennings typically lands around Mar 20, 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 10.
When is the first frost in Jennings?
The first hard freeze (28°F) in Jennings typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 235 days after the spring freeze cleared.
How long is the growing season in Jennings?
Measured between 28°F hard freezes, Jennings sees about 235 frost-free days — roughly Mar 20 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 10 to Oct 27, about 200 days.
Is the soil safe to grow vegetables in Jennings?
The federal record around Jennings is a meaningful one — 48 documented sites, mostly Underground Storage Tanks entries (33), the nearest Underground Storage Tanks record under a tenth of a mile 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 Jennings?
From about Oct 11 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Jennings's scale — its 7a band and its 235-day season. Your yard writes its own version of Jennings'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 Jennings’s own scale
6 of the readings below were taken at Jennings's own scale — its own ~235-day season between 28°F freezes, the 353 acres it covers and 48 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Jennings's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Jennings's own 28°F hard-freeze dates, about Mar 20 and Nov 10 and the ~235-day span between themNOAA 1991–2020 Climate Normals
- 48 documented contamination sites on the federal record near Jennings, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Jennings's boundary and the 353 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~235-day seasonGrowable Ground crop-matching engine
- The ecoregion at Jennings's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Jennings's 353 acres read through its county's SSURGO summaryfrom Pawnee County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pawnee 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 Pawnee County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Jennings's 353 acreswhy one lot differs from the next →
- Which side of Jennings you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 353 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Jennings-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaJennings sits outside our named growing regions, so Oklahoma as a whole is its closest context here.