Forgan, Oklahoma, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Forgan, 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 Forgan 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 Forgan — soil, climate, flood, and parcel records. How we handle your address.
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Forgan — the short answer
Forgan, Oklahoma: USDA zone 6b, about 203 days between hard freezes, across 252 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~203
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 252 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 6b is Forgan's average, not your lot's — a low corner or a tree line moves it. Against Forgan's 203-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Forgan
Each reading below is measured for Forgan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredForgan runs about 203 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
MeasuredForgan sits in USDA hardiness zone 6b.
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 Forgan is in
Forgan sits in the High Plains — EPA Level III, inside the wider Great Plains. That is read at Forgan's own centroid, and it is not what its county reads: Beaver County is mostly Southwestern Tablelands. The wider page above you is answering a different question about different ground.
What Grows in Forgan
Every plant below cleared Forgan's own zone 6b and its 203-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Forgan?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — 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 Forgan
Closest first, within ~10 miles of Forgan. Listing isn't leaking, and distance isn't exposure.
- Wright's Auto RepairUnderground Storage Tanks · 950 ft
- Town Of ForganUnderground Storage Tanks · 950 ft
- Forgan EquityUnderground Storage Tanks · 950 ft
- Forgan OfficeUnderground Storage Tanks · 1500 ft
- Nichols Water ServiceUnderground Storage Tanks · 2300 ft
- Miller Oil CoUnderground Storage Tanks · 2300 ft
- MILES CRUDE OIL PUMP STATIONBrownfields · 2.5 mi
- Mocane BoosterUnderground Storage Tanks · 2.8 mi
- Forgan - Cabot BoosterUnderground Storage Tanks · 2.8 mi
- Blakemore BoosterUnderground Storage Tanks · 3.6 mi
- Fac. Name: Nursery 137, Well No. 256Nitrate · 4.0 mi
- Fac. Name: Nursery 137, Well No. 254Nitrate · 4.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Forgan'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 Forgan.
Total Sites
113
within ~10 miles of Forgan
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Forgan
Severity Distribution
within ~10 miles of Forgan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Forgan, Nitrate runs higher than the national average — 78 sites within ~10 miles of Forgan. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Forgan
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 Forgan average
Your land is one point inside Forgan
Everything above resolves to Forgan as a whole — one PHZM band and one 28°F frost record, read across 252 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 Forgan Average
Forgan Average
- ●USDA Zones 6b, averaged across Forgan
- ●One soil character for all of Forgan
- ●Frost dates read at Forgan's scale: Apr 9 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Forgan's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Forgan
Pull a site-specific report for your exact address in Forgan, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Forgan averages can't show:
We read public map data around Forgan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Forgan average
How we know this about Forgan
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 Forgan’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 Forgan
When does frost risk typically end in Forgan?
The last hard freeze (28°F) in Forgan typically lands around Apr 9, 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 30.
When is the first frost in Forgan?
The first hard freeze (28°F) in Forgan typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 203 days after the spring freeze cleared.
How long is the growing season in Forgan?
Measured between 28°F hard freezes, Forgan sees about 203 frost-free days — roughly Apr 9 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 15, about 168 days.
Is the soil safe to grow vegetables in Forgan?
The federal record around Forgan shows 113 documented sites, mostly Nitrate entries (78), the nearest Underground Storage Tanks record about 0.2 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 Forgan?
From about Sep 29 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 Oct 29 (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 Oct 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Forgan's scale — its 6b band and its 203-day season. Your yard writes its own version of Forgan'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 Forgan’s own scale
6 of the readings below were taken at Forgan's own scale — its own ~203-day season between 28°F freezes, the 252 acres it covers and 113 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Forgan's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Forgan's own 28°F hard-freeze dates, about Apr 9 and Oct 29 and the ~203-day span between themNOAA 1991–2020 Climate Normals
- 113 documented contamination sites on the federal record near Forgan, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Forgan's boundary and the 252 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~203-day seasonGrowable Ground crop-matching engine
- Forgan sits in the High 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 Forgan's 252 acres read through its county's SSURGO summaryfrom Beaver County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Beaver 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 Beaver County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Forgan's 252 acreswhy one lot differs from the next →
- Which side of Forgan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 252 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 Forgan-wide figureread your own land →
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