Hollis, Oklahoma, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Hollis, 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 Hollis 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 Hollis — soil, climate, flood, and parcel records. How we handle your address.
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Hollis — the short answer
Hollis, Oklahoma: USDA zone 7b, about 234 days between hard freezes, across 950 acres of city.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 22
- 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
- ~234
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 950 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 Hollis's average, not your lot's — a low corner or a tree line moves it. Against Hollis's 234-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hollis
Each reading below is measured for Hollis itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHollis runs about 234 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
MeasuredHollis 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 Hollis is in
Hollis sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Hollis's own centroid rather than borrowed from Harmon County.
What Grows in Hollis
Every plant below cleared Hollis's own zone 7b and its 234-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Hollis?
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 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 22 (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. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Hollis
Closest first, within ~10 miles of Hollis. Listing isn't leaking, and distance isn't exposure.
- The Water'n HoleUnderground Storage Tanks · 800 ft
- National Guard ArmoryUnderground Storage Tanks · 1700 ft
- Lee Roy CrawfordUnderground Storage Tanks · 1700 ft
- Okla Dept Of TransUnderground Storage Tanks · 1800 ft
- Love's Country Store #10Underground Storage Tanks · 0.5 mi
- Phillips 66 Co #019053Underground Storage Tanks · 0.5 mi
- Hollis 66Underground Storage Tanks · 0.5 mi
- Harmon Electric Assn., Inc.Underground Storage Tanks · 0.6 mi
- Dixon-Kirchoff, Inc.Tractor ShoUnderground Storage Tanks · 0.6 mi
- Motley Gin IncUnderground Storage Tanks · 0.6 mi
- Farmer StationUnderground Storage Tanks · 0.7 mi
- Dixon-Kirchoff, Inc.Underground Storage Tanks · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hollis'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 Hollis.
Severity Distribution
within ~10 miles of Hollis
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hollis, Underground Storage Tanks runs higher than the national average — 27 sites within ~10 miles of Hollis. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Hollis
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 Hollis average
Your land is one point inside Hollis
Everything above resolves to Hollis as a whole — one PHZM band and one 28°F frost record, read across 950 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 Hollis Average
Hollis Average
- ●USDA Zones 7b, averaged across Hollis
- ●One soil character for all of Hollis
- ●Frost dates read at Hollis's scale: Mar 22 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Hollis's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hollis
Pull a site-specific report for your exact address in Hollis, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hollis averages can't show:
We read public map data around Hollis — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hollis average
How we know this about Hollis
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 Hollis’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 Hollis
When does frost risk typically end in Hollis?
The last hard freeze (28°F) in Hollis typically lands around Mar 22, 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 12.
When is the first frost in Hollis?
The first hard freeze (28°F) in Hollis 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 234 days after the spring freeze cleared.
How long is the growing season in Hollis?
Measured between 28°F hard freezes, Hollis sees about 234 frost-free days — roughly Mar 22 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 12 to Oct 28, about 199 days.
Is the soil safe to grow vegetables in Hollis?
The federal record around Hollis is light — 29 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (27), the nearest Underground Storage Tanks record about 0.2 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Hollis?
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 Hollis's scale — its 7b band and its 234-day season. Your yard writes its own version of Hollis'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 Hollis’s own scale
6 of the readings below were taken at Hollis's own scale — its own ~234-day season between 28°F freezes, the 950 acres it covers and 29 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hollis's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Hollis's own 28°F hard-freeze dates, about Mar 22 and Nov 11 and the ~234-day span between themNOAA 1991–2020 Climate Normals
- 29 documented contamination sites on the federal record near Hollis, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Hollis's boundary and the 950 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~234-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hollis's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hollis's 950 acres read through its county's SSURGO summaryfrom Harmon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Harmon 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 Harmon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hollis's 950 acreswhy one lot differs from the next →
- Which side of Hollis you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 950 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 Hollis-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaHollis sits outside our named growing regions, so Oklahoma as a whole is its closest context here.