Dewey, Oklahoma, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, hazelnut, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Dewey, 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 Dewey 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 Dewey — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Dewey — the short answer
Dewey, Oklahoma: USDA zone 7a, about 229 days between hard freezes, across 2K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 25
- 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
- ~229
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 Dewey's average, not your lot's — a low corner or a tree line moves it. Against Dewey's 229-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dewey
Each reading below is measured for Dewey itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDewey runs about 229 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
MeasuredDewey 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 Dewey is in
Dewey sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Dewey's own centroid rather than borrowed from Washington County.
What Grows in Dewey
Every plant below cleared Dewey's own zone 7a and its 229-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Dewey?
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 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 25 (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. 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 Dewey
Closest first, within ~10 miles of Dewey. Listing isn't leaking, and distance isn't exposure.
- Kim's Quick StopUnderground Storage Tanks · 550 ft
- Dewey Dx Service StationUnderground Storage Tanks · 800 ft
- Former Pop ShoppeUnderground Storage Tanks · 1100 ft
- Bartlesville Ready Mix IncUnderground Storage Tanks · 1200 ft
- Chevalley Moving & Storage of Dewey, Inc.Underground Storage Tanks · 1500 ft
- Casey's General Store #3426Underground Storage Tanks · 1800 ft
- Phillips 66 Co #040073Underground Storage Tanks · 0.6 mi
- Phillips 66 Co #04006811M N OsUnderground Storage Tanks · 0.6 mi
- Phillips 66 CoUnderground Storage Tanks · 0.6 mi
- Phillips 66 Co #040071Underground Storage Tanks · 0.7 mi
- Dewey TireUnderground Storage Tanks · 0.8 mi
- Ez Mart #665Underground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dewey'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 Dewey.
Sources Checked
within ~10 miles of Dewey
Severity Distribution
within ~10 miles of Dewey
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dewey, Superfund runs higher than the national average — 5 sites within ~10 miles of Dewey. 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.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Dewey
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 Dewey average
Your land is one point inside Dewey
Everything above resolves to Dewey as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Dewey Average
Dewey Average
- ●USDA Zones 7a, averaged across Dewey
- ●One soil character for all of Dewey
- ●Frost dates read at Dewey's scale: Mar 25 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Dewey's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dewey
Pull a site-specific report for your exact address in Dewey, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dewey averages can't show:
We read public map data around Dewey — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dewey average
How we know this about Dewey
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 Dewey’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 Dewey
When does frost risk typically end in Dewey?
The last hard freeze (28°F) in Dewey typically lands around Mar 25, 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 15.
When is the first frost in Dewey?
The first hard freeze (28°F) in Dewey 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 229 days after the spring freeze cleared.
How long is the growing season in Dewey?
Measured between 28°F hard freezes, Dewey sees about 229 frost-free days — roughly Mar 25 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 15 to Oct 26, about 194 days.
Is the soil safe to grow vegetables in Dewey?
The federal record around Dewey is a meaningful one — 209 documented sites, mostly Underground Storage Tanks entries (121), 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 Dewey?
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 Dewey's scale — its 7a band and its 229-day season. Your yard writes its own version of Dewey'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 Dewey’s own scale
6 of the readings below were taken at Dewey's own scale — its own ~229-day season between 28°F freezes, the 1,725 acres it covers and 209 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dewey's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Dewey's own 28°F hard-freeze dates, about Mar 25 and Nov 9 and the ~229-day span between themNOAA 1991–2020 Climate Normals
- 209 documented contamination sites on the federal record near Dewey, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Dewey's boundary and the 1,725 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~229-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dewey's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dewey's 1,725 acres read through its county's SSURGO summaryfrom Washington County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washington 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 Washington County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dewey's 1,725 acreswhy one lot differs from the next →
- Which side of Dewey you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,725 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 Dewey-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaDewey sits outside our named growing regions, so Oklahoma as a whole is its closest context here.
Nearby growing guides