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

Planting zone for 08880 — South Bound Brook, NJ

ZIP code 08880 (South Bound Brook, Somerset County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 11 and the first fall frost October 28.

Where ZIP 08880 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 11

First frostOct 28

2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for South Bound Brook, NJ…

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 South Bound Brook, NJ

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsApril 27only 10% chance of frost after

First fall frostOctober 28median — 10% chance by Oct 13

Growing season198 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 7.

From the NOAA station Plainfield, NJ — 7 miles away, elevation 89 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 08880

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 28 – Mar 14

SpinachSow outdoors · Feb 28 – Mar 21

Broccoli, cabbageStart indoors · Jan 31 – Feb 14

Broccoli, cabbageTransplant · Mar 21 – Apr 4

Onion setsPlant outdoors · Mar 14 – Mar 28

PotatoesPlant outdoors · Mar 21 – Apr 4

LettuceSow outdoors · Mar 14 – Mar 28

Carrots, beetsSow outdoors · Mar 21 – Apr 4

TomatoesStart indoors · Feb 14 – Feb 28

TomatoesTransplant · Apr 18 – May 2

Peppers, eggplantStart indoors · Jan 31 – Feb 14

Peppers, eggplantTransplant · Apr 25 – May 9

BeansSow outdoors · Apr 18 – May 2

Sweet cornSow outdoors · Apr 18 – May 2

Cucumbers, squashSow outdoors · Apr 18 – May 2

Fall lettuce, spinachSow outdoors · Sep 2 – Sep 16

GarlicPlant cloves · Oct 14 – Nov 18

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 28) 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 08880 came on Mar 24 — about the same time as the 1991–2020 average (Mar 25).

average
Mar 252026
Mar 24

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 7a in New Jersey

600 plants native to the lower 48 states, recorded in New Jersey, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 South Bound Brook, NJ.

Soil in South Bound Brook, NJ

The soil mapped at the center of ZIP 08880 is Dunellen — sandy loam, well drained.

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

pH5.0strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupAwater soaks in fast

Farmland classprime farmlandUSDA classification

Map unit: Dunellen sandy loam, 3 to 8 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 08880; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in South Bound Brook, NJ

Summer high88 °Faverage high, July

Winter low24 °Faverage low, January

Hot days29days a year at 90 °F or more

Freezing nights103nights a year at 32 °F or less

Growing degree days3,713base 50 °F — the season’s usable heat

Longest day15 h 05 mindaylight on June 21

Shortest day9 h 16 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation49.6 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: Plainfield, NJ (7 mi away); precipitation: Franklin Twp 4.6 Nnw, NJ (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

088057a

Bound Brook, NJ · 1 mi

Martinsville, NJ · 3 mi

088547a

Piscataway, NJ · 4 mi

New Jersey planting zones →

Questions about 08880

What planting zone is ZIP code 08880?

ZIP code 08880 (South Bound Brook, NJ) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in South Bound Brook, NJ?

The median last spring frost (32 °F) near 08880 is April 11; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Plainfield station.

When is the first frost in South Bound Brook, NJ?

The median first fall frost near 08880 is October 28, giving a median frost-free growing season of 198 days.

When should I plant tomatoes in 08880?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 08880 get?

About 49.6 inches of precipitation a year (NOAA 1991–2020 normals, Franklin Twp 4.6 Nnw station).

How hot do summers get in South Bound Brook, NJ?

The average high peaks at 88 °F in July, with about 29 days a year at 90 °F or more.

What kind of soil does 08880 have?

The USDA soil survey maps Dunellen at the center of ZIP 08880: sandy loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in South Bound Brook, NJ in 2026?

Spring leaf-out near 08880 came on Mar 24 in 2026, about the same as the 1991–2020 average (Mar 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in South Bound Brook, NJ?

Long-day onions: the longest day near 08880 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 08880 change?

Yes. The 2012 USDA map put 08880 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.