Alpharetta, Georgia, sits in USDA hardiness zone 8a — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Alpharetta, 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 Alpharetta 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 Alpharetta — soil, climate, flood, and parcel records. How we handle your address.
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Alpharetta — the short answer
Alpharetta, Georgia: USDA zone 8a, about 249 days between hard freezes, across 17K acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~249
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 17K 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 Alpharetta's average, not your lot's — a low corner or a tree line moves it. Against Alpharetta's 249-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Alpharetta
Each reading below is measured for Alpharetta itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAlpharetta runs about 249 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
MeasuredAlpharetta 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 Alpharetta is in
Alpharetta sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Alpharetta's own centroid rather than borrowed from Fulton County.
What Grows in Alpharetta
Every plant below cleared Alpharetta's own zone 8a and its 249-day season. Each card opens that plant's Georgia profile. How we score.
Is it too late to plant in Alpharetta?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 19 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Alpharetta
Closest first, within ~10 miles of Alpharetta. Listing isn't leaking, and distance isn't exposure.
- QUIKTRIP #782Underground Storage Tanks · 1500 ft
- ALPHARETTA FIRE DEPTUnderground Storage Tanks · 1600 ft
- SAM'S MART # 506Underground Storage Tanks · 1800 ft
- NIC - ALPHARETTA LLCBrownfields · 2000 ft
- SIEMENS INDUSTRY INCBrownfields · 2500 ft
- RaceTrac #648 - Old MiltonUnderground Storage Tanks · 0.6 mi
- BANJEE ENTERPRISES LLCUnderground Storage Tanks · 0.7 mi
- CSI LABORATORIESBrownfields · 0.8 mi
- CHEVRON STATION #210390Underground Storage Tanks · 0.9 mi
- FRANK WATKINS PAINT SHOPBrownfields · 0.9 mi
- UPS - SCS ALPHARETTABrownfields · 1.0 mi
- KAISER PERMANENTE ALPHARETTA MEDICAL OFFICEBrownfields · 1.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Alpharetta'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 Alpharetta.
Total Sites
916
within ~10 miles of Alpharetta
Risk Level
Elevated
Highest-severity
10 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Alpharetta
Severity Distribution
within ~10 miles of Alpharetta
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Alpharetta, Toxics Release Inventory runs higher than the national average — 71 sites within ~10 miles of Alpharetta. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Alpharetta
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 Alpharetta average
Your land is one point inside Alpharetta
Everything above resolves to Alpharetta as a whole — one PHZM band and one 28°F frost record, read across 17K 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 Alpharetta Average
Alpharetta Average
- ●USDA Zones 8a, averaged across Alpharetta
- ●One soil character for all of Alpharetta
- ●Frost dates read at Alpharetta's scale: Mar 15 to Nov 19
YOUR Parcel
- ✓Your exact zone, not Alpharetta's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Alpharetta
Pull a site-specific report for your exact address in Alpharetta, Georgia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Alpharetta averages can't show:
We read public map data around Alpharetta — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alpharetta average
How we know this about Alpharetta
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 Alpharetta’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 Alpharetta
When does frost risk typically end in Alpharetta?
The last hard freeze (28°F) in Alpharetta typically lands around Mar 15, 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 5.
When is the first frost in Alpharetta?
The first hard freeze (28°F) in Alpharetta typically arrives around Nov 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 5, so the watching starts about Oct 20 — about 249 days after the spring freeze cleared.
How long is the growing season in Alpharetta?
Measured between 28°F hard freezes, Alpharetta sees about 249 frost-free days — roughly Mar 15 through Nov 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 5 to Nov 5, about 214 days.
Is the soil safe to grow vegetables in Alpharetta?
The federal record around Alpharetta is a meaningful one — 916 documented sites, mostly Underground Storage Tanks entries (529), the nearest Underground Storage Tanks record about 0.3 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 Alpharetta?
From about Oct 20 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 19 (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 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Alpharetta's scale — its 8a band and its 249-day season. Your yard writes its own version of Alpharetta'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 Alpharetta’s own scale
6 of the readings below were taken at Alpharetta's own scale — its own ~249-day season between 28°F freezes, the 17,216 acres it covers and 916 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Alpharetta's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Alpharetta's own 28°F hard-freeze dates, about Mar 15 and Nov 19 and the ~249-day span between themNOAA 1991–2020 Climate Normals
- 916 documented contamination sites on the federal record near Alpharetta, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Alpharetta's boundary and the 17,216 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~249-day seasonGrowable Ground crop-matching engine
- The ecoregion at Alpharetta's own centroid, the PiedmontUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Alpharetta's 17,216 acres read through its county's SSURGO summaryfrom Fulton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Fulton 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 Fulton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Alpharetta's 17,216 acreswhy one lot differs from the next →
- Which side of Alpharetta you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 17,216 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Alpharetta-wide figureread your own land →
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