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

Planting zone for 30628 — Colbert, GA

ZIP code 30628 (Colbert, Madison County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is April 2 and the first fall frost November 2.

Where ZIP 30628 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 frostApr 2
First frostNov 2
2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Colbert, 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 Colbert, GA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 2median — 50% chance of a later frost
Safe for tender plantsApril 16only 10% chance of frost after
First fall frostNovember 2median — 10% chance by Oct 21
Growing season217 daysfrost-free, median

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

From the NOAA station Winterville, GA — 6 miles away, elevation 889 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 30628

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 19 – Mar 5
SpinachSow outdoors · Feb 19 – Mar 12
Broccoli, cabbageStart indoors · Jan 22 – Feb 5
Broccoli, cabbageTransplant · Mar 12 – Mar 26
Onion setsPlant outdoors · Mar 5 – Mar 19
PotatoesPlant outdoors · Mar 12 – Mar 26
LettuceSow outdoors · Mar 5 – Mar 19
Carrots, beetsSow outdoors · Mar 12 – Mar 26
TomatoesStart indoors · Feb 5 – Feb 19
TomatoesTransplant · Apr 9 – Apr 23
Peppers, eggplantStart indoors · Jan 22 – Feb 5
Peppers, eggplantTransplant · Apr 16 – Apr 30
BeansSow outdoors · Apr 9 – Apr 23
Sweet cornSow outdoors · Apr 9 – Apr 23
Cucumbers, squashSow outdoors · Apr 9 – Apr 23
Fall lettuce, spinachSow outdoors · Sep 7 – Sep 21
GarlicPlant cloves · Oct 19 – Nov 23
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 2) and first fall frost (Nov 2) 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 30628 came on Feb 16 — 4 days later than the 1991–2020 average (Feb 12).

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 Colbert, GA

The soil mapped at the center of ZIP 30628 is Cecil — 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 matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Cecil sandy loam, 6 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 30628; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Colbert, GA

Summer high88 °Faverage high, July
Winter low30 °Faverage low, January
Hot days41days a year at 90 °F or more
Freezing nights62nights a year at 32 °F or less
Growing degree days4,624base 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
Precipitation50.5 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 54 °F, low 30 °F 54°30° JanFebruary: average high 58 °F, low 33 °F 58°33° FebMarch: average high 66 °F, low 39 °F 66°39° MarApril: average high 74 °F, low 47 °F 74°47° AprMay: average high 80 °F, low 55 °F 80°55° MayJune: average high 85 °F, low 64 °F 85°64° JunJuly: average high 88 °F, low 67 °F 88°67° JulAugust: average high 87 °F, low 67 °F 87°67° AugSeptember: average high 82 °F, low 60 °F 82°60° SepOctober: average high 73 °F, low 48 °F 73°48° OctNovember: average high 63 °F, low 38 °F 63°38° NovDecember: average high 56 °F, low 32 °F 56°32° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.46 in precipitation 4.5 JanFebruary: 4.64 in precipitation 4.6 FebMarch: 4.75 in precipitation 4.8 MarApril: 3.41 in precipitation 3.4 AprMay: 3.76 in precipitation 3.8 MayJune: 4.46 in precipitation 4.5 JunJuly: 4.10 in precipitation 4.1 JulAugust: 4.62 in precipitation 4.6 AugSeptember: 4.02 in precipitation 4.0 SepOctober: 3.44 in precipitation 3.4 OctNovember: 3.90 in precipitation 3.9 NovDecember: 4.91 in precipitation 4.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Winterville, GA (6 mi away); precipitation: Colbert 3.1 Sse, GA (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

306468b
Hull, GA · 6 mi
306838a
Winterville, GA · 6 mi
306298a
Comer, GA · 7 mi
306018b
Athens, GA · 8 mi
306308a
Crawford, GA · 10 mi
306338a
Danielsville, GA · 10 mi
306038b
Athens, GA · 10 mi
306478a
Ila, GA · 11 mi

Georgia planting zones →

Questions about 30628

What planting zone is ZIP code 30628?

ZIP code 30628 (Colbert, 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 Colbert, GA?

The median last spring frost (32 °F) near 30628 is April 2; after April 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Winterville station.

When is the first frost in Colbert, GA?

The median first fall frost near 30628 is November 2, giving a median frost-free growing season of 217 days.

When should I plant tomatoes in 30628?

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

How much rain and snow does 30628 get?

About 50.5 inches of precipitation a year (NOAA 1991–2020 normals, Colbert 3.1 Sse station).

How hot do summers get in Colbert, GA?

The average high peaks at 88 °F in July, with about 41 days a year at 90 °F or more.

What kind of soil does 30628 have?

The USDA soil survey maps Cecil at the center of ZIP 30628: sandy loam, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Colbert, GA in 2026?

Spring leaf-out near 30628 came on Feb 16 in 2026, 4 days later than the 1991–2020 average (Feb 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Colbert, GA?

Intermediate onions: the longest day near 30628 is 14 h 25 min, so day-neutral types bulb best; long-day varieties may not bulb fully.