Mangum, Oklahoma, sits in USDA hardiness zone 7b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, prickly pear, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Mangum, 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 Mangum 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 Mangum — soil, climate, flood, and parcel records. How we handle your address.
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Mangum — the short answer
Mangum, Oklahoma: USDA zone 7b, about 233 days between hard freezes, across 1K acres of city.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 23
- 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
- ~233
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 Mangum's average, not your lot's — a low corner or a tree line moves it. Against Mangum's 233-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mangum
Each reading below is measured for Mangum itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMangum runs about 233 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
MeasuredMangum 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 Mangum is in
Mangum sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Mangum's own centroid rather than borrowed from Greer County.
What Grows in Mangum
Every plant below cleared Mangum's own zone 7b and its 233-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Mangum?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 23; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 23 (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 Mangum
Closest first, within ~10 miles of Mangum. Listing isn't leaking, and distance isn't exposure.
- Mangum Public SchoolsUnderground Storage Tanks · 650 ft
- Love's Country Stores, Inc #33Underground Storage Tanks · 750 ft
- Speedys #132Underground Storage Tanks · 1000 ft
- O L . RoulainUnderground Storage Tanks · 1100 ft
- Shamrock StationUnderground Storage Tanks · 1300 ft
- Tab's Conoco StationUnderground Storage Tanks · 1400 ft
- The Church TriumphantUnderground Storage Tanks · 1900 ft
- Mangum Oil & Gas Co.Underground Storage Tanks · 2100 ft
- Bob's Radiator & StationUnderground Storage Tanks · 2300 ft
- Regal Oak Station #784Underground Storage Tanks · 2300 ft
- L E Caffey Service StationUnderground Storage Tanks · 2500 ft
- Sheward BrosUnderground Storage Tanks · 2600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Mangum'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 Mangum.
Sources Checked
within ~10 miles of Mangum
Severity Distribution
within ~10 miles of Mangum
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mangum, Nitrate runs higher than the national average — 24 sites within ~10 miles of Mangum. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Mangum
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 Mangum average
Your land is one point inside Mangum
Everything above resolves to Mangum as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Mangum Average
Mangum Average
- ●USDA Zones 7b, averaged across Mangum
- ●One soil character for all of Mangum
- ●Frost dates read at Mangum's scale: Mar 23 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Mangum's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mangum
Pull a site-specific report for your exact address in Mangum, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mangum averages can't show:
We read public map data around Mangum — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mangum average
How we know this about Mangum
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 Mangum’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 Mangum
When does frost risk typically end in Mangum?
The last hard freeze (28°F) in Mangum typically lands around Mar 23, 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 13.
When is the first frost in Mangum?
The first hard freeze (28°F) in Mangum 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 233 days after the spring freeze cleared.
How long is the growing season in Mangum?
Measured between 28°F hard freezes, Mangum sees about 233 frost-free days — roughly Mar 23 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 13 to Oct 28, about 198 days.
Is the soil safe to grow vegetables in Mangum?
The federal record around Mangum shows 56 documented sites, mostly Underground Storage Tanks entries (30), the nearest Underground Storage Tanks record about 0.1 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Mangum?
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 Mangum's scale — its 7b band and its 233-day season. Your yard writes its own version of Mangum'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 Mangum’s own scale
6 of the readings below were taken at Mangum's own scale — its own ~233-day season between 28°F freezes, the 1,079 acres it covers and 56 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mangum's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Mangum's own 28°F hard-freeze dates, about Mar 23 and Nov 11 and the ~233-day span between themNOAA 1991–2020 Climate Normals
- 56 documented contamination sites on the federal record near Mangum, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Mangum's boundary and the 1,079 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~233-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mangum's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mangum's 1,079 acres read through its county's SSURGO summaryfrom Greer County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Greer 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 Greer County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mangum's 1,079 acreswhy one lot differs from the next →
- Which side of Mangum you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,079 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 Mangum-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaMangum sits outside our named growing regions, so Oklahoma as a whole is its closest context here.