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

Planting zone for 08094 — Williamstown, NJ

ZIP code 08094 (Williamstown, Gloucester County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 14 and the first fall frost October 27.

Where ZIP 08094 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 14
First frostOct 27
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Williamstown, 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 Williamstown, NJ

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 14median — 50% chance of a later frost
Safe for tender plantsApril 27only 10% chance of frost after
First fall frostOctober 27median — 10% chance by Oct 13
Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 5.

From the NOAA station Hammonton 1 Ne, NJ — 8 miles away, elevation 125 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 08094

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 3 – Mar 17
SpinachSow outdoors · Mar 3 – Mar 24
Broccoli, cabbageStart indoors · Feb 3 – Feb 17
Broccoli, cabbageTransplant · Mar 24 – Apr 7
Onion setsPlant outdoors · Mar 17 – Mar 31
PotatoesPlant outdoors · Mar 24 – Apr 7
LettuceSow outdoors · Mar 17 – Mar 31
Carrots, beetsSow outdoors · Mar 24 – Apr 7
TomatoesStart indoors · Feb 17 – Mar 3
TomatoesTransplant · Apr 21 – May 5
Peppers, eggplantStart indoors · Feb 3 – Feb 17
Peppers, eggplantTransplant · Apr 28 – May 12
BeansSow outdoors · Apr 21 – May 5
Sweet cornSow outdoors · Apr 21 – May 5
Cucumbers, squashSow outdoors · Apr 21 – May 5
Fall lettuce, spinachSow outdoors · Sep 1 – Sep 15
GarlicPlant cloves · Oct 13 – Nov 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 14) and first fall frost (Oct 27) 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 08094 came on Mar 13 — 6 days earlier than the 1991–2020 average (Mar 19).

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.

Trees 80

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 119

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 201

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °F

Grasses 175

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °FAtlantic mannagrass3 ft · blooms summer · low shade tolerance · to −8 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °F

Vines 10

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °F

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 Williamstown, NJ.

Soil in Williamstown, NJ

The soil mapped at the center of ZIP 08094 is Aura — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH4.0strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.6%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Aura-Sassafras sandy loams, 5 to 10 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 08094; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Williamstown, NJ

Summer high87 °Faverage high, July
Winter low24 °Faverage low, January
Hot days28days a year at 90 °F or more
Freezing nights105nights a year at 32 °F or less
Growing degree days3,643base 50 °F — the season’s usable heat
Longest day14 h 59 mindaylight on June 21
Shortest day9 h 22 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation47.4 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 24 °F 42°24° JanFebruary: average high 45 °F, low 25 °F 45°25° FebMarch: average high 52 °F, low 31 °F 52°31° MarApril: average high 64 °F, low 41 °F 64°41° AprMay: average high 73 °F, low 51 °F 73°51° MayJune: average high 82 °F, low 61 °F 82°61° JunJuly: average high 87 °F, low 67 °F 87°67° JulAugust: average high 85 °F, low 64 °F 85°64° AugSeptember: average high 79 °F, low 57 °F 79°57° SepOctober: average high 67 °F, low 45 °F 67°45° OctNovember: average high 56 °F, low 35 °F 56°35° NovDecember: average high 47 °F, low 29 °F 47°29° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.52 in precipitation 3.5 JanFebruary: 3.00 in precipitation 3.0 FebMarch: 4.40 in precipitation 4.4 MarApril: 3.51 in precipitation 3.5 AprMay: 3.63 in precipitation 3.6 MayJune: 4.40 in precipitation 4.4 JunJuly: 4.62 in precipitation 4.6 JulAugust: 4.91 in precipitation 4.9 AugSeptember: 4.29 in precipitation 4.3 SepOctober: 3.89 in precipitation 3.9 OctNovember: 3.16 in precipitation 3.2 NovDecember: 4.11 in precipitation 4.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hammonton 1 Ne, NJ (8 mi away); precipitation: Winslow Twp 3.5 W, NJ (4 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.

080957a
Winslow, NJ · 5 mi
080187a
Cedar Brook, NJ · 5 mi
083227b
Franklinville, NJ · 5 mi
080817a
Sicklerville, NJ · 6 mi
083447a
Newfield, NJ · 6 mi
083127b
Clayton, NJ · 7 mi
083287b
Malaga, NJ · 7 mi
080097a
Berlin, NJ · 8 mi

New Jersey planting zones →

Questions about 08094

What planting zone is ZIP code 08094?

ZIP code 08094 (Williamstown, 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 Williamstown, NJ?

The median last spring frost (32 °F) near 08094 is April 14; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hammonton 1 Ne station.

When is the first frost in Williamstown, NJ?

The median first fall frost near 08094 is October 27, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 08094?

Start tomato seeds indoors around Feb 17 – Mar 3 and set transplants outside around Apr 21 – May 5, one to three weeks after the median last frost.

How much rain and snow does 08094 get?

About 47.4 inches of precipitation a year (NOAA 1991–2020 normals, Winslow Twp 3.5 W station).

How hot do summers get in Williamstown, NJ?

The average high peaks at 87 °F in July, with about 28 days a year at 90 °F or more.

What kind of soil does 08094 have?

The USDA soil survey maps Aura at the center of ZIP 08094: sandy loam, well drained, pH about 4.0 (strongly acidic).

Did spring come early in Williamstown, NJ in 2026?

Spring leaf-out near 08094 came on Mar 13 in 2026, 6 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Williamstown, NJ?

Intermediate onions: the longest day near 08094 is 14 h 59 min, so day-neutral types bulb best; long-day varieties may not bulb fully.