Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 39828 — Cairo, GA

ZIP code 39828 (Cairo, Terrell County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 11 and the first fall frost November 21.

Where ZIP 39828 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.

Zone9a20 to 25 °F

Coldest night−6.7 to −3.9 °C

Last frostMar 11

First frostNov 21

2012 zone8b

Was 8b 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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Cairo, 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 Cairo, GA

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMarch 11median — 50% chance of a later frost

Safe for tender plantsMarch 31only 10% chance of frost after

First fall frostNovember 21median — 10% chance by Nov 4

Growing season255 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 25 and returns around December 6.

From the NOAA station Cairo 1sw, GA — 5 miles away, elevation 200 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 39828

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 28 – Feb 11

SpinachSow outdoors · Jan 28 – Feb 18

Broccoli, cabbageStart indoors · Dec 31 – Jan 14

Broccoli, cabbageTransplant · Feb 18 – Mar 4

Onion setsPlant outdoors · Feb 11 – Feb 25

PotatoesPlant outdoors · Feb 18 – Mar 4

LettuceSow outdoors · Feb 11 – Feb 25

Carrots, beetsSow outdoors · Feb 18 – Mar 4

TomatoesStart indoors · Jan 14 – Jan 28

TomatoesTransplant · Mar 18 – Apr 1

Peppers, eggplantStart indoors · Dec 31 – Jan 14

Peppers, eggplantTransplant · Mar 25 – Apr 8

BeansSow outdoors · Mar 18 – Apr 1

Sweet cornSow outdoors · Mar 18 – Apr 1

Cucumbers, squashSow outdoors · Mar 18 – Apr 1

Fall lettuce, spinachSow outdoors · Sep 26 – Oct 10

GarlicPlant cloves · Nov 7 – Dec 12

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 11) and first fall frost (Nov 21) 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 39828 came on Jan 27 — about the same time as the 1991–2020 average (Jan 26).

average
Jan 262026
Jan 27

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 9a in Georgia

603 plants native to the lower 48 states, recorded in Georgia, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

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 Cairo, GA.

Soil in Cairo, GA

The soil mapped at the center of ZIP 39828 is Blanton — 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 groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Blanton loamy sand, 5 to 12 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 39828; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cairo, GA

Summer high90 °Faverage high, June

Winter low38 °Faverage low, January

Hot days78days a year at 90 °F or more

Freezing nights30nights a year at 32 °F or less

Growing degree days6,342base 50 °F — the season’s usable heat

Longest day14 h 09 mindaylight on June 21

Shortest day10 h 09 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation50.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cairo 1sw, GA (5 mi away); precipitation: Cairo 1sw, GA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

Thomasville, GA · 11 mi

323129a

Tallahassee, FL · 13 mi

398349a

Climax, GA · 14 mi

317589a

Thomasville, GA · 15 mi

317999a

Thomasville, GA · 15 mi

All 2 ZIP codes in Cairo → · Georgia planting zones →

Questions about 39828

What planting zone is ZIP code 39828?

ZIP code 39828 (Cairo, GA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Cairo, GA?

The median last spring frost (32 °F) near 39828 is March 11; after March 31 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cairo 1sw station.

When is the first frost in Cairo, GA?

The median first fall frost near 39828 is November 21, giving a median frost-free growing season of 255 days.

When should I plant tomatoes in 39828?

Start tomato seeds indoors around Jan 14 – Jan 28 and set transplants outside around Mar 18 – Apr 1, one to three weeks after the median last frost.

How much rain and snow does 39828 get?

About 50.9 inches of precipitation a year (NOAA 1991–2020 normals, Cairo 1sw station).

How hot do summers get in Cairo, GA?

The average high peaks at 90 °F in June, with about 78 days a year at 90 °F or more.

What kind of soil does 39828 have?

The USDA soil survey maps Blanton at the center of ZIP 39828: loamy sand, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Cairo, GA in 2026?

Spring leaf-out near 39828 came on Jan 27 in 2026, about the same as the 1991–2020 average (Jan 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Cairo, GA?

Short-day onions: the longest day near 39828 is 14 h 09 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 39828 change?

Yes. The 2012 USDA map put 39828 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.