Silo, Oklahoma, sits in USDA hardiness zone 8a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Silo, 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 Silo 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 Silo — soil, climate, flood, and parcel records. How we handle your address.
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Silo — the short answer
Silo, Oklahoma: USDA zone 8a, about 264 days between hard freezes, across 333 acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~264
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 333 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 Silo's average, not your lot's — a low corner or a tree line moves it. Against Silo's 264-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Silo
Each reading below is measured for Silo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSilo runs about 264 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
MeasuredSilo 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 Silo is in
Silo sits in the Cross Timbers — EPA Level III, inside the wider Great Plains. That is read at Silo's own centroid, and it is not what its county reads: Bryan County is mostly East Central Texas Plains. The wider page above you is answering a different question about different ground.
What Grows in Silo
Every plant below cleared Silo's own zone 8a and its 264-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Silo?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 23 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Silo
Closest first, within ~10 miles of Silo. Listing isn't leaking, and distance isn't exposure.
- Speers Grocery & StationUnderground Storage Tanks · 450 ft
- Sil School (N-W G Durant)Underground Storage Tanks · 1300 ft
- At&T-C Spaulding (L441690)Underground Storage Tanks · 1.7 mi
- ROLL OFFS USAToxics Release Inventory · 2.6 mi
- ROLL OFFS USABrownfields · 2.6 mi
- Country Music PlaceUnderground Storage Tanks · 2.6 mi
- EZ Mart #4444Underground Storage Tanks · 2.6 mi
- CARDINAL FG-DURANTToxics Release Inventory · 2.7 mi
- CARDINAL FG COMPANY DURANTBrownfields · 2.7 mi
- Kingston One StopUnderground Storage Tanks · 2.8 mi
- G & S Country StoreUnderground Storage Tanks · 3.4 mi
- General StoreUnderground Storage Tanks · 3.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Silo'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 Silo.
Total Sites
177
within ~10 miles of Silo
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Silo
Severity Distribution
within ~10 miles of Silo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Silo, two things run higher than the national average within ~10 miles of Silo — Superfund (3 sites) and Toxics Release Inventory (14 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Silo
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 Silo average
Your land is one point inside Silo
Everything above resolves to Silo as a whole — one PHZM band and one 28°F frost record, read across 333 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 Silo Average
Silo Average
- ●USDA Zones 8a, averaged across Silo
- ●One soil character for all of Silo
- ●Frost dates read at Silo's scale: Mar 4 to Nov 23
YOUR Parcel
- ✓Your exact zone, not Silo's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Silo
Pull a site-specific report for your exact address in Silo, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Silo averages can't show:
We read public map data around Silo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Silo average
How we know this about Silo
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 Silo’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 Silo
When does frost risk typically end in Silo?
The last hard freeze (28°F) in Silo typically lands around Mar 4, 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 25.
When is the first frost in Silo?
The first hard freeze (28°F) in Silo typically arrives around Nov 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 9, so the watching starts about Oct 24 — about 264 days after the spring freeze cleared.
How long is the growing season in Silo?
Measured between 28°F hard freezes, Silo sees about 264 frost-free days — roughly Mar 4 through Nov 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 25 to Nov 9, about 229 days.
Is the soil safe to grow vegetables in Silo?
The federal record around Silo is a meaningful one — 177 documented sites, mostly Underground Storage Tanks entries (137), the nearest Underground Storage Tanks record under a tenth of a mile 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 Silo?
From about Oct 24 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 23 (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 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Silo's scale — its 8a band and its 264-day season. Your yard writes its own version of Silo'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 Silo’s own scale
6 of the readings below were taken at Silo's own scale — its own ~264-day season between 28°F freezes, the 333 acres it covers and 177 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Silo's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Silo's own 28°F hard-freeze dates, about Mar 4 and Nov 23 and the ~264-day span between themNOAA 1991–2020 Climate Normals
- 177 documented contamination sites on the federal record near Silo, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Silo's boundary and the 333 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~264-day seasonGrowable Ground crop-matching engine
- Silo sits in the Cross Timbers — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Silo's 333 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 Silo's 333 acreswhy one lot differs from the next →
- Which side of Silo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 333 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Silo-wide figureread your own land →