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

Planting zone for 31329 — Springfield, GA

ZIP code 31329 (Springfield, Effingham County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 7 and the first fall frost November 21.

Where ZIP 31329 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 7
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 Springfield, 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 Springfield, GA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 7median — 50% chance of a later frost
Safe for tender plantsMarch 27only 10% chance of frost after
First fall frostNovember 21median — 10% chance by Nov 5
Growing season257 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 22 and returns around December 8.

From the NOAA station Brooklet 1 W, GA — 19 miles away, elevation 180 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 31329

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 24 – Feb 7
SpinachSow outdoors · Jan 24 – Feb 14
Broccoli, cabbageStart indoors · Dec 27 – Jan 10
Broccoli, cabbageTransplant · Feb 14 – Feb 28
Onion setsPlant outdoors · Feb 7 – Feb 21
PotatoesPlant outdoors · Feb 14 – Feb 28
LettuceSow outdoors · Feb 7 – Feb 21
Carrots, beetsSow outdoors · Feb 14 – Feb 28
TomatoesStart indoors · Jan 10 – Jan 24
TomatoesTransplant · Mar 14 – Mar 28
Peppers, eggplantStart indoors · Dec 27 – Jan 10
Peppers, eggplantTransplant · Mar 21 – Apr 4
BeansSow outdoors · Mar 14 – Mar 28
Sweet cornSow outdoors · Mar 14 – Mar 28
Cucumbers, squashSow outdoors · Mar 14 – Mar 28
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 7) 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 31329 came on Feb 2 — 3 days later than the 1991–2020 average (Jan 30).

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 Springfield, GA

The soil mapped at the center of ZIP 31329 is Blanton — sand, somewhat excessively drained.

TextureSanddrains and warms fast; dries out and needs more feeding
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Blanton-Foxworth complex, 0 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 31329; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Springfield, GA

Summer high93 °Faverage high, July
Winter low38 °Faverage low, January
Hot days80days a year at 90 °F or more
Freezing nights28nights a year at 32 °F or less
Growing degree days6,322base 50 °F — the season’s usable heat
Longest day14 h 17 mindaylight on June 21
Shortest day10 h 01 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation52.8 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 61 °F, low 38 °F 61°38° JanFebruary: average high 64 °F, low 40 °F 64°40° FebMarch: average high 71 °F, low 46 °F 71°46° MarApril: average high 79 °F, low 53 °F 79°53° AprMay: average high 86 °F, low 62 °F 86°62° MayJune: average high 91 °F, low 69 °F 91°69° JunJuly: average high 93 °F, low 72 °F 93°72° JulAugust: average high 92 °F, low 71 °F 92°71° AugSeptember: average high 87 °F, low 66 °F 87°66° SepOctober: average high 79 °F, low 56 °F 79°56° OctNovember: average high 70 °F, low 45 °F 70°45° NovDecember: average high 63 °F, low 40 °F 63°40° Dec

Precipitation by month inches

0″2″4″6″8″January: 3.75 in precipitation 3.8 JanFebruary: 4.56 in precipitation 4.6 FebMarch: 3.43 in precipitation 3.4 MarApril: 3.59 in precipitation 3.6 AprMay: 3.26 in precipitation 3.3 MayJune: 7.71 in precipitation 7.7 JunJuly: 5.48 in precipitation 5.5 JulAugust: 6.97 in precipitation 7.0 AugSeptember: 4.40 in precipitation 4.4 SepOctober: 3.16 in precipitation 3.2 OctNovember: 2.73 in precipitation 2.7 NovDecember: 3.80 in precipitation 3.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Brooklet 1 W, GA (19 mi away); precipitation: Springfield, GA (5 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.

313038b
Clyo, GA · 6 mi
313129a
Guyton, GA · 8 mi
304468b
Newington, GA · 11 mi
313269a
Rincon, GA · 12 mi
299228b
Garnett, SC · 12 mi
299439a
Tillman, SC · 13 mi
304499a
Oliver, GA · 13 mi
304159a
Brooklet, GA · 16 mi

Georgia planting zones →

Questions about 31329

What planting zone is ZIP code 31329?

ZIP code 31329 (Springfield, 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 Springfield, GA?

The median last spring frost (32 °F) near 31329 is March 7; after March 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Brooklet 1 W station.

When is the first frost in Springfield, GA?

The median first fall frost near 31329 is November 21, giving a median frost-free growing season of 257 days.

When should I plant tomatoes in 31329?

Start tomato seeds indoors around Jan 10 – Jan 24 and set transplants outside around Mar 14 – Mar 28, one to three weeks after the median last frost.

How much rain and snow does 31329 get?

About 52.8 inches of precipitation a year (NOAA 1991–2020 normals, Springfield station).

How hot do summers get in Springfield, GA?

The average high peaks at 93 °F in July, with about 80 days a year at 90 °F or more.

What kind of soil does 31329 have?

The USDA soil survey maps Blanton at the center of ZIP 31329: sand, somewhat excessively drained, pH about 5.3 (strongly acidic).

Did spring come early in Springfield, GA in 2026?

Spring leaf-out near 31329 came on Feb 2 in 2026, 3 days later than the 1991–2020 average (Jan 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Springfield, GA?

Short-day onions: the longest day near 31329 is 14 h 17 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 31329 change?

Yes. The 2012 USDA map put 31329 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.