Stone Mountain, Georgia, 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.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Stone Mountain, 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 Stone Mountain 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 Stone Mountain — soil, climate, flood, and parcel records. How we handle your address.
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Stone Mountain — the short answer
Stone Mountain, Georgia: USDA zone 8a, about 269 days between hard freezes, across 1K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 5
- DeKalb County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 29
- DeKalb County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~269
- DeKalb County normal — NOAA 1991–2020, nearest to this town
- City area
- 1K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are DeKalb County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8a is Stone Mountain's average, not your lot's — a low corner or a tree line moves it. Against Stone Mountain's 269-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Stone Mountain
Each reading below is measured for Stone Mountain itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsStone Mountain runs about 269 days between hard freezes (read from DeKalb County, the closest normal to Stone Mountain) — 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
MeasuredStone Mountain 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 Stone Mountain is in
Stone Mountain sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Stone Mountain's own centroid rather than borrowed from DeKalb County.
What Grows in Stone Mountain
Every plant below cleared Stone Mountain's own zone 8a and its 269-day season. Each card opens that plant's Georgia profile. How we score.
Is it too late to plant in Stone Mountain?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 5 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 29 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Stone Mountain
Closest first, within ~10 miles of Stone Mountain. Listing isn't leaking, and distance isn't exposure.
- WEEYUMS PHILLY STEAK & HOAGIESUnderground Storage Tanks · 650 ft
- FINE ARTS SIGNS INCBrownfields · 750 ft
- STONE MOUNTAIN DRIVER ED RANGEUnderground Storage Tanks · 900 ft
- STONE MOUNTAIN STREETSCAPE IUnderground Storage Tanks · 1100 ft
- STONE MOUNTAIN TEXACOUnderground Storage Tanks · 1500 ft
- GEORGIA STONE MOUNTAIN PARKUnderground Storage Tanks · 1900 ft
- STONE MOUNTAIN PROBATION BOOT CAUnderground Storage Tanks · 2200 ft
- CITY OF STONE MOUNTAIN ABANDONED DRUM SITESuperfund · 2300 ft
- STONE MOUNTAIN MEMORIAL ASSOCIATION - WAREHOUSE NO. 2Brownfields · 0.5 mi
- BASKET BAKERY & GARDEN CAFEUnderground Storage Tanks · 0.5 mi
- Dobbins AFBUnderground Storage Tanks · 0.5 mi
- CITGO FOOD MARTUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Stone Mountain'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 Stone Mountain.
Total Sites
1,912
within ~10 miles of Stone Mountain
Risk Level
Elevated
Highest-severity
26 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Stone Mountain
Severity Distribution
within ~10 miles of Stone Mountain
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Stone Mountain, two things run higher than the national average within ~10 miles of Stone Mountain — Underground Storage Tanks (1,346 sites) and Superfund (26 sites). That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Stone Mountain
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 Stone Mountain average
Your land is one point inside Stone Mountain
Everything above resolves to Stone Mountain as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from DeKalb County’s record because no 30-year normal resolves at this city’s own centroid. 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 Stone Mountain Average
Stone Mountain Average
- ●USDA Zones 8a, averaged across Stone Mountain
- ●One soil character for all of Stone Mountain
- ●Frost dates read at Stone Mountain's scale: Mar 5 to Nov 29
YOUR Parcel
- ✓Your exact zone, not Stone Mountain's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Stone Mountain
Pull a site-specific report for your exact address in Stone Mountain, Georgia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Stone Mountain averages can't show:
We read public map data around Stone Mountain — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Stone Mountain average
How we know this about Stone Mountain
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 DeKalb County’s record, because none resolves here; 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 Stone Mountain
When does frost risk typically end in Stone Mountain?
The last hard freeze (28°F) in Stone Mountain typically lands around Mar 5, 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 26.
When is the first frost in Stone Mountain?
The first hard freeze (28°F) in Stone Mountain typically arrives around Nov 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 15, so the watching starts about Oct 30 — about 269 days after the spring freeze cleared.
How long is the growing season in Stone Mountain?
Measured between 28°F hard freezes, Stone Mountain sees about 269 frost-free days — roughly Mar 5 through Nov 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 26 to Nov 15, about 234 days.
Is the soil safe to grow vegetables in Stone Mountain?
The federal record around Stone Mountain is a meaningful one — 1,912 documented sites, mostly Underground Storage Tanks entries (1,346), the nearest Underground Storage Tanks record about 0.1 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 Stone Mountain?
From about Oct 30 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Stone Mountain's scale — its 8a band and its 269-day season. Your yard writes its own version of Stone Mountain'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 Stone Mountain’s own scale
5 of the readings below were taken at Stone Mountain's own scale — the 1,057 acres it covers and 1,912 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Stone Mountain's own USDA hardiness band, zones 8aUSDA PHZM 2023
- 1,912 documented contamination sites on the federal record near Stone Mountain, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Stone Mountain's boundary and the 1,057 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 Stone Mountain's own centroid, the PiedmontUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Stone Mountain has no normal of its own, so its county's is the closest measured readfrom DeKalb County
- Soil character — no town-scale survey exists, so Stone Mountain's 1,057 acres read through its county's SSURGO summaryfrom DeKalb County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom DeKalb 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 DeKalb County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Stone Mountain's 1,057 acreswhy one lot differs from the next →
- Which side of Stone Mountain you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,057 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Stone Mountain-wide figureread your own land →
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