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

Planting zone for 29621 — Anderson, SC

ZIP code 29621 (Anderson, Anderson County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 23 and the first fall frost November 11.

Where ZIP 29621 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 frostMar 23

First frostNov 11

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 Anderson, SC…

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 Anderson, SC

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 23median — 50% chance of a later frost

Safe for tender plantsApril 6only 10% chance of frost after

First fall frostNovember 11median — 10% chance by Oct 31

Growing season234 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 11 and returns around November 26.

From the NOAA station Anderson, SC — 4 miles away, elevation 801 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 29621

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 9 – Feb 23

SpinachSow outdoors · Feb 9 – Mar 2

Broccoli, cabbageStart indoors · Jan 12 – Jan 26

Broccoli, cabbageTransplant · Mar 2 – Mar 16

Onion setsPlant outdoors · Feb 23 – Mar 9

PotatoesPlant outdoors · Mar 2 – Mar 16

LettuceSow outdoors · Feb 23 – Mar 9

Carrots, beetsSow outdoors · Mar 2 – Mar 16

TomatoesStart indoors · Jan 26 – Feb 9

TomatoesTransplant · Mar 30 – Apr 13

Peppers, eggplantStart indoors · Jan 12 – Jan 26

Peppers, eggplantTransplant · Apr 6 – Apr 20

BeansSow outdoors · Mar 30 – Apr 13

Sweet cornSow outdoors · Mar 30 – Apr 13

Cucumbers, squashSow outdoors · Mar 30 – Apr 13

Fall lettuce, spinachSow outdoors · Sep 16 – Sep 30

GarlicPlant cloves · Oct 28 – Dec 2

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 23) and first fall frost (Nov 11) 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 29621 came on Feb 18 — 6 days later than the 1991–2020 average (Feb 12).

average
Feb 122026
Feb 18

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 8a in South Carolina

550 plants native to the lower 48 states, recorded in South Carolina, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 Anderson, SC.

Soil in Anderson, SC

The soil mapped at the center of ZIP 29621 is Cecil — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.5%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Cecil sandy loam, 2 to 6 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 29621; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Anderson, SC

Summer high91 °Faverage high, July

Winter low33 °Faverage low, January

Hot days61days a year at 90 °F or more

Freezing nights57nights a year at 32 °F or less

Growing degree days5,164base 50 °F — the season’s usable heat

Longest day14 h 28 mindaylight on June 21

Shortest day9 h 50 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation50.8 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: Anderson, SC (4 mi away); precipitation: Belton 3.5 W, SC (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Williamston, SC · 9 mi

Sandy Springs, SC · 11 mi

296848a

Starr, SC · 11 mi

All 6 ZIP codes in Anderson → · South Carolina planting zones →

Questions about 29621

What planting zone is ZIP code 29621?

ZIP code 29621 (Anderson, SC) 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 Anderson, SC?

The median last spring frost (32 °F) near 29621 is March 23; after April 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Anderson station.

When is the first frost in Anderson, SC?

The median first fall frost near 29621 is November 11, giving a median frost-free growing season of 234 days.

When should I plant tomatoes in 29621?

Start tomato seeds indoors around Jan 26 – Feb 9 and set transplants outside around Mar 30 – Apr 13, one to three weeks after the median last frost.

How much rain and snow does 29621 get?

About 50.8 inches of precipitation a year (NOAA 1991–2020 normals, Belton 3.5 W station).

How hot do summers get in Anderson, SC?

The average high peaks at 91 °F in July, with about 61 days a year at 90 °F or more.

What kind of soil does 29621 have?

The USDA soil survey maps Cecil at the center of ZIP 29621: sandy loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Anderson, SC in 2026?

Spring leaf-out near 29621 came on Feb 18 in 2026, 6 days later than the 1991–2020 average (Feb 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Anderson, SC?

Intermediate onions: the longest day near 29621 is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.