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

Planting zone for 31735 — Cobb, GA

ZIP code 31735 (Cobb, Sumter County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 9 and the first fall frost November 20.

Where ZIP 31735 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 9
First frostNov 20
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 Cobb, 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 Cobb, GA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 9median — 50% chance of a later frost
Safe for tender plantsMarch 27only 10% chance of frost after
First fall frostNovember 20median — 10% chance by Nov 4
Growing season258 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 23 and returns around December 6.

From the NOAA station Crisp Co. Pwr Dam, GA — 9 miles away, elevation 246 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 31735

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 26 – Feb 9
SpinachSow outdoors · Jan 26 – Feb 16
Broccoli, cabbageStart indoors · Dec 29 – Jan 12
Broccoli, cabbageTransplant · Feb 16 – Mar 2
Onion setsPlant outdoors · Feb 9 – Feb 23
PotatoesPlant outdoors · Feb 16 – Mar 2
LettuceSow outdoors · Feb 9 – Feb 23
Carrots, beetsSow outdoors · Feb 16 – Mar 2
TomatoesStart indoors · Jan 12 – Jan 26
TomatoesTransplant · Mar 16 – Mar 30
Peppers, eggplantStart indoors · Dec 29 – Jan 12
Peppers, eggplantTransplant · Mar 23 – Apr 6
BeansSow outdoors · Mar 16 – Mar 30
Sweet cornSow outdoors · Mar 16 – Mar 30
Cucumbers, squashSow outdoors · Mar 16 – Mar 30
Fall lettuce, spinachSow outdoors · Sep 25 – Oct 9
GarlicPlant cloves · Nov 6 – Dec 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 9) and first fall frost (Nov 20) 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 31735 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 Cobb, GA

The soil mapped at the center of ZIP 31735 is Orangeburg — loamy sand, well drained.

TextureLoamy sanddrains 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 classprime farmlandUSDA classification

Map unit: Orangeburg 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 31735; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cobb, GA

Summer high92 °Faverage high, July
Winter low37 °Faverage low, January
Hot days83days a year at 90 °F or more
Freezing nights36nights a year at 32 °F or less
Growing degree days6,198base 50 °F — the season’s usable heat
Longest day14 h 15 mindaylight on June 21
Shortest day10 h 03 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation48.9 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 59 °F, low 37 °F 59°37° JanFebruary: average high 63 °F, low 40 °F 63°40° FebMarch: average high 70 °F, low 46 °F 70°46° MarApril: average high 77 °F, low 53 °F 77°53° AprMay: average high 85 °F, low 62 °F 85°62° MayJune: average high 90 °F, low 70 °F 90°70° JunJuly: average high 92 °F, low 72 °F 92°72° JulAugust: average high 91 °F, low 72 °F 91°72° AugSeptember: average high 87 °F, low 67 °F 87°67° SepOctober: average high 78 °F, low 56 °F 78°56° OctNovember: average high 68 °F, low 45 °F 68°45° NovDecember: average high 61 °F, low 39 °F 61°39° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.77 in precipitation 4.8 JanFebruary: 4.27 in precipitation 4.3 FebMarch: 4.63 in precipitation 4.6 MarApril: 4.07 in precipitation 4.1 AprMay: 3.07 in precipitation 3.1 MayJune: 4.80 in precipitation 4.8 JunJuly: 4.61 in precipitation 4.6 JulAugust: 4.64 in precipitation 4.6 AugSeptember: 3.47 in precipitation 3.5 SepOctober: 2.43 in precipitation 2.4 OctNovember: 3.39 in precipitation 3.4 NovDecember: 4.71 in precipitation 4.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Crisp Co. Pwr Dam, GA (9 mi away); precipitation: Crisp Co. Pwr Dam, GA (9 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.

317438b
De Soto, GA · 5 mi
317648b
Leslie, GA · 7 mi
310158b
Cordele, GA · 12 mi
310108b
Cordele, GA · 12 mi
317098b
Americus, GA · 12 mi
310518b
Lilly, GA · 13 mi
310928b
Vienna, GA · 14 mi
317969a
Warwick, GA · 15 mi

Georgia planting zones →

Questions about 31735

What planting zone is ZIP code 31735?

ZIP code 31735 (Cobb, 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 Cobb, GA?

The median last spring frost (32 °F) near 31735 is March 9; after March 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Crisp Co. Pwr Dam station.

When is the first frost in Cobb, GA?

The median first fall frost near 31735 is November 20, giving a median frost-free growing season of 258 days.

When should I plant tomatoes in 31735?

Start tomato seeds indoors around Jan 12 – Jan 26 and set transplants outside around Mar 16 – Mar 30, one to three weeks after the median last frost.

How much rain and snow does 31735 get?

About 48.9 inches of precipitation a year (NOAA 1991–2020 normals, Crisp Co. Pwr Dam station).

How hot do summers get in Cobb, GA?

The average high peaks at 92 °F in July, with about 83 days a year at 90 °F or more.

What kind of soil does 31735 have?

The USDA soil survey maps Orangeburg at the center of ZIP 31735: loamy sand, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Cobb, GA in 2026?

Spring leaf-out near 31735 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 Cobb, GA?

Short-day onions: the longest day near 31735 is 14 h 15 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.