Calera, Oklahoma, sits in USDA hardiness zone 8a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include cabbage, fig, 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 Calera, 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 Calera 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 Calera — soil, climate, flood, and parcel records. How we handle your address.
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Calera — the short answer
Calera, Oklahoma: USDA zone 8a, about 269 days between hard freezes, across 3K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~269
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 8a is Calera's average, not your lot's — a low corner or a tree line moves it. Against Calera's 269-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Calera
Each reading below is measured for Calera itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCalera runs about 269 days between hard freezes — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCalera sits in USDA hardiness zone 8a.
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 Calera is in
Calera sits in the East Central Texas Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Calera's own centroid rather than borrowed from Bryan County.
What Grows in Calera
Every plant below cleared Calera's own zone 8a and its 269-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Calera?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 31; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 24 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near Calera
Closest first, within ~10 miles of Calera. Listing isn't leaking, and distance isn't exposure.
- Kwik Chek # 13Underground Storage Tanks · 1100 ft
- 07S 08EI sec. 23Nitrate · 1300 ft
- The StoreUnderground Storage Tanks · 2600 ft
- E-Z Mart #4283Underground Storage Tanks · 0.5 mi
- RANTEC MICROWAVE & ELECTRONICS INCToxics Release Inventory · 1.5 mi
- RANTEC MICROWAVE & ELECTRONICS INCBrownfields · 1.5 mi
- WASTEQUIP MANUFACTURING CO / WASTEQUIP MFG CO LLCToxics Release Inventory · 1.6 mi
- Okla National GuardUnderground Storage Tanks · 1.7 mi
- Rantec Microwave & ElectronicsUnderground Storage Tanks · 1.7 mi
- Sosu Aviation SchoolUnderground Storage Tanks · 1.8 mi
- SOUTHWEST PICKLINGSuperfund · 1.9 mi
- Eaker Field AirparkUnderground Storage Tanks · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Calera'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 Calera.
Total Sites
180
within ~10 miles of Calera
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Calera
Severity Distribution
within ~10 miles of Calera
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Calera, two things run higher than the national average within ~10 miles of Calera — Toxics Release Inventory (16 sites) and Underground Storage Tanks (135 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Calera
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 Calera average
Your land is one point inside Calera
Everything above resolves to Calera as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Calera Average
Calera Average
- ●USDA Zones 8a, averaged across Calera
- ●One soil character for all of Calera
- ●Frost dates read at Calera's scale: Feb 28 to Nov 24
YOUR Parcel
- ✓Your exact zone, not Calera's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Calera
Pull a site-specific report for your exact address in Calera, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Calera averages can't show:
We read public map data around Calera — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Calera average
How we know this about Calera
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 Calera’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 Calera
When does frost risk typically end in Calera?
The last hard freeze (28°F) in Calera typically lands around Feb 28, 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 Mar 21.
When is the first frost in Calera?
The first hard freeze (28°F) in Calera typically arrives around Nov 24, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 10, so the watching starts about Oct 25 — about 269 days after the spring freeze cleared.
How long is the growing season in Calera?
Measured between 28°F hard freezes, Calera sees about 269 frost-free days — roughly Feb 28 through Nov 24, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 21 to Nov 10, about 234 days.
Is the soil safe to grow vegetables in Calera?
The federal record around Calera is a meaningful one — 180 documented sites, mostly Underground Storage Tanks entries (135), the nearest Underground Storage Tanks record about 0.2 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 Calera?
From about Oct 25 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 24 (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 24. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Calera's scale — its 8a band and its 269-day season. Your yard writes its own version of Calera'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 Calera’s own scale
6 of the readings below were taken at Calera's own scale — its own ~269-day season between 28°F freezes, the 3,391 acres it covers and 180 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Calera's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Calera's own 28°F hard-freeze dates, about Feb 28 and Nov 24 and the ~269-day span between themNOAA 1991–2020 Climate Normals
- 180 documented contamination sites on the federal record near Calera, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Calera's boundary and the 3,391 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~269-day seasonGrowable Ground crop-matching engine
- The ecoregion at Calera's own centroid, the East Central Texas PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Calera's 3,391 acres read through its county's SSURGO summaryfrom Bryan County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Bryan 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 Bryan County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Calera's 3,391 acreswhy one lot differs from the next →
- Which side of Calera you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,391 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 Calera-wide figureread your own land →