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

Planting zone for 08323 — Greenwich, NJ

ZIP code 08323 (Greenwich, Cumberland County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 10 and the first fall frost November 1.

Where ZIP 08323 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostApr 10

First frostNov 1

2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Greenwich, 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 Greenwich, NJ

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 10median — 50% chance of a later frost

Safe for tender plantsApril 25only 10% chance of frost after

First fall frostNovember 1median — 10% chance by Oct 16

Growing season205 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 29 and returns around November 13.

From the NOAA station Seabrook Farms, NJ — 10 miles away, elevation 105 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 08323

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 27 – Mar 13

SpinachSow outdoors · Feb 27 – Mar 20

Broccoli, cabbageStart indoors · Jan 30 – Feb 13

Broccoli, cabbageTransplant · Mar 20 – Apr 3

Onion setsPlant outdoors · Mar 13 – Mar 27

PotatoesPlant outdoors · Mar 20 – Apr 3

LettuceSow outdoors · Mar 13 – Mar 27

Carrots, beetsSow outdoors · Mar 20 – Apr 3

TomatoesStart indoors · Feb 13 – Feb 27

TomatoesTransplant · Apr 17 – May 1

Peppers, eggplantStart indoors · Jan 30 – Feb 13

Peppers, eggplantTransplant · Apr 24 – May 8

BeansSow outdoors · Apr 17 – May 1

Sweet cornSow outdoors · Apr 17 – May 1

Cucumbers, squashSow outdoors · Apr 17 – May 1

Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20

GarlicPlant cloves · Oct 18 – Nov 22

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 10) and first fall frost (Nov 1) 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 08323 came on Mar 18 — about the same time as the 1991–2020 average (Mar 17).

average
Mar 172026
Mar 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 7b in New Jersey

605 plants native to the lower 48 states, recorded in New Jersey, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Greenwich, NJ.

Soil in Greenwich, NJ

The soil mapped at the center of ZIP 08323 is Mattapex — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH6.0slightly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.75%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Mattapex silt loam, 2 to 5 percent slopes, Northern Coastal Plain.

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 08323; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Greenwich, NJ

Summer high86 °Faverage high, July

Winter low25 °Faverage low, January

Hot days25days a year at 90 °F or more

Freezing nights87nights a year at 32 °F or less

Growing degree days3,698base 50 °F — the season’s usable heat

Longest day14 h 57 mindaylight on June 21

Shortest day9 h 23 mindaylight on December 21

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

Precipitation46.8 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: Seabrook Farms, NJ (10 mi away); precipitation: Upper Deerfield Twp 1.7 Sw, NJ (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Hancocks Bridge, NJ · 8 mi

083117b

Cedarville, NJ · 10 mi

New Jersey planting zones →

Questions about 08323

What planting zone is ZIP code 08323?

ZIP code 08323 (Greenwich, NJ) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Greenwich, NJ?

The median last spring frost (32 °F) near 08323 is April 10; after April 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Seabrook Farms station.

When is the first frost in Greenwich, NJ?

The median first fall frost near 08323 is November 1, giving a median frost-free growing season of 205 days.

When should I plant tomatoes in 08323?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 08323 get?

About 46.8 inches of precipitation a year (NOAA 1991–2020 normals, Upper Deerfield Twp 1.7 Sw station).

How hot do summers get in Greenwich, NJ?

The average high peaks at 86 °F in July, with about 25 days a year at 90 °F or more.

What kind of soil does 08323 have?

The USDA soil survey maps Mattapex at the center of ZIP 08323: silt loam, moderately well drained, pH about 6.0 (slightly acidic).

Did spring come early in Greenwich, NJ in 2026?

Spring leaf-out near 08323 came on Mar 18 in 2026, about the same as the 1991–2020 average (Mar 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Greenwich, NJ?

Intermediate onions: the longest day near 08323 is 14 h 57 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 08323 change?

Yes. The 2012 USDA map put 08323 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.