Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 30080 — Smyrna, GA

ZIP code 30080 (Smyrna, Cobb County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 27 and the first fall frost November 7.

Where ZIP 30080 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 27
First frostNov 7
2012 zone7b

Was 7b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Smyrna, GA…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Smyrna, GA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 27median — 50% chance of a later frost
Safe for tender plantsApril 12only 10% chance of frost after
First fall frostNovember 7median — 10% chance by Oct 27
Growing season225 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 14 and returns around November 19.

From the NOAA station Mableton 1 N, GA — 5 miles away, elevation 981 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 30080

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 13 – Feb 27
SpinachSow outdoors · Feb 13 – Mar 6
Broccoli, cabbageStart indoors · Jan 16 – Jan 30
Broccoli, cabbageTransplant · Mar 6 – Mar 20
Onion setsPlant outdoors · Feb 27 – Mar 13
PotatoesPlant outdoors · Mar 6 – Mar 20
LettuceSow outdoors · Feb 27 – Mar 13
Carrots, beetsSow outdoors · Mar 6 – Mar 20
TomatoesStart indoors · Jan 30 – Feb 13
TomatoesTransplant · Apr 3 – Apr 17
Peppers, eggplantStart indoors · Jan 16 – Jan 30
Peppers, eggplantTransplant · Apr 10 – Apr 24
BeansSow outdoors · Apr 3 – Apr 17
Sweet cornSow outdoors · Apr 3 – Apr 17
Cucumbers, squashSow outdoors · Apr 3 – Apr 17
Fall lettuce, spinachSow outdoors · Sep 12 – Sep 26
GarlicPlant cloves · Oct 24 – Nov 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 27) and first fall frost (Nov 7) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 30080 came on Feb 16 — 3 days later than the 1991–2020 average (Feb 13).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 8a in Georgia

572 plants native to the lower 48 states, recorded in Georgia, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. Each links to its USDA PLANTS profile.

Trees 88

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °FAtlantic white cedar50 ft · blooms spring · medium shade tolerance · to −36 °F

Shrubs 138

Allegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Faloe yucca15 ft · blooms early summer · medium shade tolerance · to −1 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 169

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °FAmerican water horehound1.8 ft · blooms early summer · low shade tolerance · to −38 °F

Grasses 152

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fbig cordgrass8 ft · blooms spring · high shade tolerance · to −3 °F

Vines 13

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Smyrna, GA.

Soil in Smyrna, GA

The soil mapped at the center of ZIP 30080 is Madison — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Madison sandy loam, 10 to 15 percent slopes, eroded.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 30080; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Smyrna, GA

Summer high84 °Faverage high, July
Winter low32 °Faverage low, January
Hot days10days a year at 90 °F or more
Freezing nights64nights a year at 32 °F or less
Growing degree days4,519base 50 °F — the season’s usable heat
Longest day14 h 25 mindaylight on June 21
Shortest day9 h 54 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation51.1 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 53 °F, low 32 °F 53°32° JanFebruary: average high 57 °F, low 35 °F 57°35° FebMarch: average high 65 °F, low 40 °F 65°40° MarApril: average high 72 °F, low 48 °F 72°48° AprMay: average high 77 °F, low 57 °F 77°57° MayJune: average high 82 °F, low 65 °F 82°65° JunJuly: average high 84 °F, low 68 °F 84°68° JulAugust: average high 84 °F, low 68 °F 84°68° AugSeptember: average high 80 °F, low 62 °F 80°62° SepOctober: average high 71 °F, low 51 °F 71°51° OctNovember: average high 63 °F, low 40 °F 63°40° NovDecember: average high 55 °F, low 35 °F 55°35° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.63 in precipitation 4.6 JanFebruary: 4.57 in precipitation 4.6 FebMarch: 4.87 in precipitation 4.9 MarApril: 4.26 in precipitation 4.3 AprMay: 3.79 in precipitation 3.8 MayJune: 4.17 in precipitation 4.2 JunJuly: 4.81 in precipitation 4.8 JulAugust: 3.89 in precipitation 3.9 AugSeptember: 3.89 in precipitation 3.9 SepOctober: 3.49 in precipitation 3.5 OctNovember: 4.13 in precipitation 4.1 NovDecember: 4.56 in precipitation 4.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mableton 1 N, GA (5 mi away); precipitation: Smyrna 2.3 Ne, GA (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

303398a
Atlanta, GA · 2 mi
300828a
Smyrna, GA · 3 mi
303018a
Atlanta, GA · 3 mi
303258a
Atlanta, GA · 3 mi
303488b
Atlanta, GA · 3 mi
303558a
Atlanta, GA · 3 mi
303578a
Atlanta, GA · 3 mi
303618a
Atlanta, GA · 3 mi

All 3 ZIP codes in Smyrna → · Georgia planting zones →

Questions about 30080

What planting zone is ZIP code 30080?

ZIP code 30080 (Smyrna, GA) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Smyrna, GA?

The median last spring frost (32 °F) near 30080 is March 27; after April 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mableton 1 N station.

When is the first frost in Smyrna, GA?

The median first fall frost near 30080 is November 7, giving a median frost-free growing season of 225 days.

When should I plant tomatoes in 30080?

Start tomato seeds indoors around Jan 30 – Feb 13 and set transplants outside around Apr 3 – Apr 17, one to three weeks after the median last frost.

How much rain and snow does 30080 get?

About 51.1 inches of precipitation a year (NOAA 1991–2020 normals, Smyrna 2.3 Ne station).

How hot do summers get in Smyrna, GA?

The average high peaks at 84 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 30080 have?

The USDA soil survey maps Madison at the center of ZIP 30080: sandy loam, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Smyrna, GA in 2026?

Spring leaf-out near 30080 came on Feb 16 in 2026, 3 days later than the 1991–2020 average (Feb 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Smyrna, GA?

Intermediate onions: the longest day near 30080 is 14 h 25 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 30080 change?

Yes. The 2012 USDA map put 30080 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.