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

Planting zone for 30471 — Twin City, GA

ZIP code 30471 (Twin City, Emanuel County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 2 and the first fall frost November 27.

Where ZIP 30471 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostMar 2
First frostNov 27
2012 zone8b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Twin City, 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 Twin City, GA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 2median — 50% chance of a later frost
Safe for tender plantsMarch 25only 10% chance of frost after
First fall frostNovember 27median — 10% chance by Nov 7
Growing season269 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 12 and returns around December 16.

From the NOAA station Metter, GA — 12 miles away, elevation 121 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 30471

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 19 – Feb 2
SpinachSow outdoors · Jan 19 – Feb 9
Broccoli, cabbageStart indoors · Dec 22 – Jan 5
Broccoli, cabbageTransplant · Feb 9 – Feb 23
Onion setsPlant outdoors · Feb 2 – Feb 16
PotatoesPlant outdoors · Feb 9 – Feb 23
LettuceSow outdoors · Feb 2 – Feb 16
Carrots, beetsSow outdoors · Feb 9 – Feb 23
TomatoesStart indoors · Jan 5 – Jan 19
TomatoesTransplant · Mar 9 – Mar 23
Peppers, eggplantStart indoors · Dec 22 – Jan 5
Peppers, eggplantTransplant · Mar 16 – Mar 30
BeansSow outdoors · Mar 9 – Mar 23
Sweet cornSow outdoors · Mar 9 – Mar 23
Cucumbers, squashSow outdoors · Mar 9 – Mar 23
Fall lettuce, spinachSow outdoors · Oct 2 – Oct 16
GarlicPlant cloves · Nov 13 – Dec 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 2) and first fall frost (Nov 27) 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 30471 came on Feb 2 — about the same time as the 1991–2020 average (Jan 31).

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).

Soil in Twin City, GA

The soil mapped at the center of ZIP 30471 is Cowarts — loamy sand, well drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Cowarts loamy sand, 2 to 5 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 30471; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Twin City, GA

Summer high92 °Faverage high, July
Winter low39 °Faverage low, January
Hot days82days a year at 90 °F or more
Freezing nights24nights a year at 32 °F or less
Growing degree days6,467base 50 °F — the season’s usable heat
Longest day14 h 17 mindaylight on June 21
Shortest day10 h 00 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation47.5 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 60 °F, low 39 °F 60°39° JanFebruary: average high 65 °F, low 42 °F 65°42° FebMarch: average high 71 °F, low 48 °F 71°48° MarApril: average high 78 °F, low 54 °F 78°54° AprMay: average high 86 °F, low 63 °F 86°63° MayJune: average high 91 °F, low 70 °F 91°70° JunJuly: average high 92 °F, low 73 °F 92°73° JulAugust: average high 91 °F, low 73 °F 91°73° AugSeptember: average high 86 °F, low 68 °F 86°68° SepOctober: average high 78 °F, low 57 °F 78°57° OctNovember: average high 69 °F, low 47 °F 69°47° NovDecember: average high 63 °F, low 41 °F 63°41° Dec

Precipitation by month inches

0″2″4″6″January: 4.20 in precipitation 4.2 JanFebruary: 3.54 in precipitation 3.5 FebMarch: 4.09 in precipitation 4.1 MarApril: 2.87 in precipitation 2.9 AprMay: 3.54 in precipitation 3.5 MayJune: 4.84 in precipitation 4.8 JunJuly: 5.78 in precipitation 5.8 JulAugust: 6.35 in precipitation 6.3 AugSeptember: 3.52 in precipitation 3.5 SepOctober: 2.45 in precipitation 2.5 OctNovember: 2.93 in precipitation 2.9 NovDecember: 3.41 in precipitation, 0.2 in snowfall 3.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Metter, GA (12 mi away); precipitation: Stillmore, GA (7 mi away). 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.

304648b
Stillmore, GA · 8 mi
304018b
Swainsboro, GA · 11 mi
304258b
Garfield, GA · 11 mi
304398b
Metter, GA · 11 mi
304488b
Nunez, GA · 11 mi
304508b
Portal, GA · 15 mi
304209a
Cobbtown, GA · 17 mi
304518b
Pulaski, GA · 17 mi

Georgia planting zones →

Questions about 30471

What planting zone is ZIP code 30471?

ZIP code 30471 (Twin City, GA) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Twin City, GA?

The median last spring frost (32 °F) near 30471 is March 2; after March 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Metter station.

When is the first frost in Twin City, GA?

The median first fall frost near 30471 is November 27, giving a median frost-free growing season of 269 days.

When should I plant tomatoes in 30471?

Start tomato seeds indoors around Jan 5 – Jan 19 and set transplants outside around Mar 9 – Mar 23, one to three weeks after the median last frost.

How much rain and snow does 30471 get?

About 47.5 inches of precipitation a year (NOAA 1991–2020 normals, Stillmore station).

How hot do summers get in Twin City, GA?

The average high peaks at 92 °F in July, with about 82 days a year at 90 °F or more.

What kind of soil does 30471 have?

The USDA soil survey maps Cowarts at the center of ZIP 30471: loamy sand, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Twin City, GA in 2026?

Spring leaf-out near 30471 came on Feb 2 in 2026, about the same as the 1991–2020 average (Jan 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Twin City, GA?

Short-day onions: the longest day near 30471 is 14 h 17 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.