Symsonia, Kentucky, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Symsonia, 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 Symsonia 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 Symsonia — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Symsonia — the short answer
Symsonia, Kentucky: USDA zone 7a, about 238 days between hard freezes, across 972 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~238
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 972 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 Symsonia's average, not your lot's — a low corner or a tree line moves it. Against Symsonia's 238-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Symsonia
Each reading below is measured for Symsonia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSymsonia runs about 238 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
MeasuredSymsonia 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 Symsonia is in
Symsonia sits in the Mississippi Valley Loess Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Symsonia's own centroid rather than borrowed from Graves County.
What Grows in Symsonia
Every plant below cleared Symsonia's own zone 7a and its 238-day season. Each card opens that plant's Kentucky profile. How we score.
Is it too late to plant in Symsonia?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 13 — 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 Symsonia
Closest first, within ~10 miles of Symsonia. Listing isn't leaking, and distance isn't exposure.
- Symsonia ChevronUnderground Storage Tanks · 950 ft
- Gibson SawmillUnderground Storage Tanks · 1500 ft
- J5B0071Nitrate · 1600 ft
- Symsonia Food & FuelUnderground Storage Tanks · 1800 ft
- E M Bailey Distributing CompanyUnderground Storage Tanks · 0.8 mi
- J5B0025Nitrate · 2.2 mi
- J & M Mart LLCUnderground Storage Tanks · 2.6 mi
- J5B0058Nitrate · 2.6 mi
- J5B0118Nitrate · 2.7 mi
- Symsonia Elementary SchoolUnderground Storage Tanks · 2.7 mi
- J5B0106Nitrate · 2.9 mi
- C B Goodman & Sons Lumber IncUnderground Storage Tanks · 3.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Symsonia'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 Symsonia.
Total Sites
367
within ~10 miles of Symsonia
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Symsonia
Severity Distribution
within ~10 miles of Symsonia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Symsonia, Nitrate runs higher than the national average — 216 sites within ~10 miles of Symsonia. That's not a problem with your land — it's information about it.
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 Symsonia
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 Symsonia average
Your land is one point inside Symsonia
Everything above resolves to Symsonia as a whole — one PHZM band and one 28°F frost record, read across 972 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 Symsonia Average
Symsonia Average
- ●USDA Zones 7a, averaged across Symsonia
- ●One soil character for all of Symsonia
- ●Frost dates read at Symsonia's scale: Mar 20 to Nov 13
YOUR Parcel
- ✓Your exact zone, not Symsonia's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Symsonia
Pull a site-specific report for your exact address in Symsonia, Kentucky — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Symsonia averages can't show:
We read public map data around Symsonia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Symsonia average
How we know this about Symsonia
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 Symsonia’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 Symsonia
When does frost risk typically end in Symsonia?
The last hard freeze (28°F) in Symsonia typically lands around Mar 20, 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 10.
When is the first frost in Symsonia?
The first hard freeze (28°F) in Symsonia typically arrives around Nov 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 30, so the watching starts about Oct 14 — about 238 days after the spring freeze cleared.
How long is the growing season in Symsonia?
Measured between 28°F hard freezes, Symsonia sees about 238 frost-free days — roughly Mar 20 through Nov 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 10 to Oct 30, about 203 days.
Is the soil safe to grow vegetables in Symsonia?
The federal record around Symsonia is a meaningful one — 367 documented sites, mostly Nitrate entries (216), 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 Symsonia?
From about Oct 14 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 13 (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 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Symsonia's scale — its 7a band and its 238-day season. Your yard writes its own version of Symsonia'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 Symsonia’s own scale
6 of the readings below were taken at Symsonia's own scale — its own ~238-day season between 28°F freezes, the 972 acres it covers and 367 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Symsonia's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Symsonia's own 28°F hard-freeze dates, about Mar 20 and Nov 13 and the ~238-day span between themNOAA 1991–2020 Climate Normals
- 367 documented contamination sites on the federal record near Symsonia, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Symsonia's boundary and the 972 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~238-day seasonGrowable Ground crop-matching engine
- The ecoregion at Symsonia's own centroid, the Mississippi Valley Loess PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Symsonia's 972 acres read through its county's SSURGO summaryfrom Graves County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Graves County
- The growing challenges every Kentucky grower plans around — written at state scale, so they stay on the state guidefrom Kentucky
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Graves County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Symsonia's 972 acreswhy one lot differs from the next →
- Which side of Symsonia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 972 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 Symsonia-wide figureread your own land →