Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for 27577 — Smithfield, NC

ZIP code 27577 (Smithfield, Johnston County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 29 and the first fall frost November 5.

Where ZIP 27577 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 29

First frostNov 5

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 Smithfield, NC…

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 Smithfield, NC

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 29median — 50% chance of a later frost

Safe for tender plantsApril 14only 10% chance of frost after

First fall frostNovember 5median — 10% chance by Oct 22

Growing season220 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 16 and returns around November 17.

From the NOAA station Smithfield, NC — 2 miles away, elevation 151 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 27577

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 15 – Mar 1

SpinachSow outdoors · Feb 15 – Mar 8

Broccoli, cabbageStart indoors · Jan 18 – Feb 1

Broccoli, cabbageTransplant · Mar 8 – Mar 22

Onion setsPlant outdoors · Mar 1 – Mar 15

PotatoesPlant outdoors · Mar 8 – Mar 22

LettuceSow outdoors · Mar 1 – Mar 15

Carrots, beetsSow outdoors · Mar 8 – Mar 22

TomatoesStart indoors · Feb 1 – Feb 15

TomatoesTransplant · Apr 5 – Apr 19

Peppers, eggplantStart indoors · Jan 18 – Feb 1

Peppers, eggplantTransplant · Apr 12 – Apr 26

BeansSow outdoors · Apr 5 – Apr 19

Sweet cornSow outdoors · Apr 5 – Apr 19

Cucumbers, squashSow outdoors · Apr 5 – Apr 19

Fall lettuce, spinachSow outdoors · Sep 10 – Sep 24

GarlicPlant cloves · Oct 22 – Nov 26

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 5) 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 27577 came on Feb 22 — 6 days later than the 1991–2020 average (Feb 16).

average
Feb 162026
Feb 22

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 North Carolina

619 plants native to the lower 48 states, recorded in North 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 Smithfield, NC.

Soil in Smithfield, NC

The soil mapped at the center of ZIP 27577 is Udorthents — sandy clay loam, well drained.

TextureSandy clay loamholds water and nutrients; slow to drain and warm up

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

DrainageWell drainednatural drainage class

Organic matter0.1%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Udorthents, loamy.

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 27577; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Smithfield, NC

Summer high92 °Faverage high, July

Winter low31 °Faverage low, January

Hot days53days a year at 90 °F or more

Freezing nights76nights a year at 32 °F or less

Growing degree days5,127base 50 °F — the season’s usable heat

Longest day14 h 33 mindaylight on June 21

Shortest day9 h 45 mindaylight on December 21

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

Precipitation49.4 inper year, rain and melted snow

Snowfall1 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Smithfield, NC (2 mi away); precipitation: Smithfield, NC (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

275688a

Pine Level, NC · 6 mi

275938a

Wilsons Mills, NC · 7 mi

Princeton, NC · 11 mi

North Carolina planting zones →

Questions about 27577

What planting zone is ZIP code 27577?

ZIP code 27577 (Smithfield, NC) 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 Smithfield, NC?

The median last spring frost (32 °F) near 27577 is March 29; after April 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Smithfield station.

When is the first frost in Smithfield, NC?

The median first fall frost near 27577 is November 5, giving a median frost-free growing season of 220 days.

When should I plant tomatoes in 27577?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 27577 get?

About 49.4 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, Smithfield station).

How hot do summers get in Smithfield, NC?

The average high peaks at 92 °F in July, with about 53 days a year at 90 °F or more.

What kind of soil does 27577 have?

The USDA soil survey maps Udorthents at the center of ZIP 27577: sandy clay loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Smithfield, NC in 2026?

Spring leaf-out near 27577 came on Feb 22 in 2026, 6 days later than the 1991–2020 average (Feb 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Smithfield, NC?

Intermediate onions: the longest day near 27577 is 14 h 33 min, so day-neutral types bulb best; long-day varieties may not bulb fully.