Hiram, Georgia, sits in USDA hardiness zone 8a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Hiram, 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 Hiram 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 Hiram — soil, climate, flood, and parcel records. How we handle your address.
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Hiram — the short answer
Hiram, Georgia: USDA zone 8a, about 251 days between hard freezes, across 3K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~251
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City 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 Hiram's average, not your lot's — a low corner or a tree line moves it. Against Hiram's 251-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hiram
Each reading below is measured for Hiram itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHiram runs about 251 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
MeasuredHiram 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 Hiram is in
Hiram sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hiram's own centroid rather than borrowed from Paulding County.
What Grows in Hiram
Every plant below cleared Hiram's own zone 8a and its 251-day season. Each card opens that plant's Georgia profile. How we score.
Is it too late to plant in Hiram?
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 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — 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 Hiram
Closest first, within ~10 miles of Hiram. Listing isn't leaking, and distance isn't exposure.
- RaceTrac #610 - HiramUnderground Storage Tanks · 350 ft
- SAMS CLUB #4802Brownfields · 800 ft
- SAMS #4802Underground Storage Tanks · 850 ft
- HOME DEPOT STORE #151Brownfields · 1100 ft
- CIRCLE M FOOD SHOP #54Underground Storage Tanks · 1200 ft
- WALGREENS #17568Brownfields · 1200 ft
- ALSOBROOKS GARAGEUnderground Storage Tanks · 1300 ft
- BAGWELL & SPEARS #36Underground Storage Tanks · 1500 ft
- WALMART SUPERCENTER #618Brownfields · 0.5 mi
- TARGET STORE T1400Brownfields · 0.5 mi
- SALLY BEAUTY SUPPLY #2767Brownfields · 0.5 mi
- HIRAM FOOD AND FUELUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hiram'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 Hiram.
Total Sites
498
within ~10 miles of Hiram
Risk Level
Elevated
Highest-severity
8 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Hiram
Severity Distribution
within ~10 miles of Hiram
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hiram, two things run higher than the national average within ~10 miles of Hiram — Superfund (8 sites) and Underground Storage Tanks (340 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.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Hiram
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 Hiram average
Your land is one point inside Hiram
Everything above resolves to Hiram 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 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 Hiram Average
Hiram Average
- ●USDA Zones 8a, averaged across Hiram
- ●One soil character for all of Hiram
- ●Frost dates read at Hiram's scale: Mar 14 to Nov 20
YOUR Parcel
- ✓Your exact zone, not Hiram's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hiram
Pull a site-specific report for your exact address in Hiram, Georgia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hiram averages can't show:
We read public map data around Hiram — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hiram average
How we know this about Hiram
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 Hiram’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 Hiram
When does frost risk typically end in Hiram?
The last hard freeze (28°F) in Hiram typically lands around Mar 14, 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 4.
When is the first frost in Hiram?
The first hard freeze (28°F) in Hiram typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 251 days after the spring freeze cleared.
How long is the growing season in Hiram?
Measured between 28°F hard freezes, Hiram sees about 251 frost-free days — roughly Mar 14 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 4 to Nov 6, about 216 days.
Is the soil safe to grow vegetables in Hiram?
The federal record around Hiram is a meaningful one — 498 documented sites, mostly Underground Storage Tanks entries (340), 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 Hiram?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hiram's scale — its 8a band and its 251-day season. Your yard writes its own version of Hiram'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 Hiram’s own scale
6 of the readings below were taken at Hiram's own scale — its own ~251-day season between 28°F freezes, the 2,517 acres it covers and 498 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hiram's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Hiram's own 28°F hard-freeze dates, about Mar 14 and Nov 20 and the ~251-day span between themNOAA 1991–2020 Climate Normals
- 498 documented contamination sites on the federal record near Hiram, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Hiram's boundary and the 2,517 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~251-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hiram's own centroid, the PiedmontUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hiram's 2,517 acres read through its county's SSURGO summaryfrom Paulding County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Paulding County
- The growing challenges every Georgia grower plans around — written at state scale, so they stay on the state guidefrom Georgia
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Paulding County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hiram's 2,517 acreswhy one lot differs from the next →
- Which side of Hiram you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,517 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 Hiram-wide figureread your own land →
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