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

Planting zone for Marietta, GA

Marietta, GA is in USDA zone 8a across its 13 ZIP codes. The median last spring frost is March 27 and the first fall frost November 7.

Marietta on the zone map

Outlined: its 8 ZIP code areas · 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
ZIP codes13
Last frostMar 27
First frostNov 7
Growing season225 days

8a 13 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Marietta, 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 Marietta, 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, 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 Marietta

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 30090 came on Feb 17 — about the same time as the 1991–2020 average (Feb 15).

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 Marietta, GA.

Soil in Marietta, GA

The soil mapped at the center of ZIP 30090 is Appling — sandy loam, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

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: Urban land-Appling complex, 2 to 10 percent slopes.

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 30090; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Marietta, 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 53 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 (7 mi away); precipitation: Smyrna 2.3 Ne, GA (5 mi away). Daylight is calculated from latitude.

ZIP codes in Marietta

300068a
10 to 15 °F
300078a
10 to 15 °F
300088a
10 to 15 °F
300608a
10 to 15 °F
300618a
10 to 15 °F
300628a
10 to 15 °F
300638a
10 to 15 °F
300648a
10 to 15 °F
300658a
10 to 15 °F
300668a
10 to 15 °F
300678a
10 to 15 °F
300688a
10 to 15 °F
300908a
10 to 15 °F

Georgia planting zones →

Questions about Marietta

What planting zone is Marietta, GA?

Marietta, GA is in USDA hardiness zone 8a on the 2023 map (8a: 10 to 15 °F).

When is the last frost in Marietta, GA?

The median last spring frost is March 27 and the median first fall frost is November 7 (NOAA 1991–2020 normals, Mableton 1 N station).

When can I plant a garden in Marietta, GA?

Cool-season crops like peas and spinach go in around Feb 13 – Mar 6; tomatoes, peppers, beans and squash after about Apr 3, once frost risk has passed.

What kind of onions grow in Marietta, GA?

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

How much rain and snow does Marietta, GA get?

About 51.1 inches of precipitation a year (NOAA 1991–2020 normals).