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

Planting zone for 08807 — Bridgewater, NJ

ZIP code 08807 (Bridgewater, Somerset County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 30 and the first fall frost October 20.

Where ZIP 08807 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 30
First frostOct 20
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 Bridgewater, 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 Bridgewater, NJ

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 14only 10% chance of frost after
First fall frostOctober 20median — 10% chance by Oct 5
Growing season172 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around October 31.

From the NOAA station Somerville 4 Nw, NJ — 2 miles away, elevation 135 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 08807

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 25 – Sep 8
GarlicPlant cloves · Oct 6 – Nov 10
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 20) 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 08807 came on Mar 24 — 4 days earlier than the 1991–2020 average (Mar 28).

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).

Soil in Bridgewater, NJ

The soil mapped at the center of ZIP 08807 is Lansdowne — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Lansdowne silt loam, 0 to 2 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 08807; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bridgewater, NJ

Summer high86 °Faverage high, July
Winter low19 °Faverage low, January
Hot days16days a year at 90 °F or more
Freezing nights137nights a year at 32 °F or less
Growing degree days2,964base 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)
Precipitation46.7 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 39 °F, low 19 °F 39°19° JanFebruary: average high 41 °F, low 20 °F 41°20° FebMarch: average high 50 °F, low 27 °F 50°27° MarApril: average high 62 °F, low 36 °F 62°36° AprMay: average high 72 °F, low 46 °F 72°46° MayJune: average high 81 °F, low 56 °F 81°56° JunJuly: average high 86 °F, low 62 °F 86°62° JulAugust: average high 83 °F, low 60 °F 83°60° AugSeptember: average high 77 °F, low 53 °F 77°53° SepOctober: average high 64 °F, low 41 °F 64°41° OctNovember: average high 54 °F, low 31 °F 54°31° NovDecember: average high 43 °F, low 24 °F 43°24° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.55 in precipitation 3.5 JanFebruary: 2.79 in precipitation 2.8 FebMarch: 4.11 in precipitation 4.1 MarApril: 3.96 in precipitation 4.0 AprMay: 3.44 in precipitation 3.4 MayJune: 4.25 in precipitation 4.3 JunJuly: 4.68 in precipitation 4.7 JulAugust: 3.74 in precipitation 3.7 AugSeptember: 4.26 in precipitation 4.3 SepOctober: 4.27 in precipitation 4.3 OctNovember: 3.20 in precipitation 3.2 NovDecember: 4.42 in precipitation 4.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Somerville 4 Nw, NJ (2 mi away); precipitation: Somerville 4 Nw, NJ (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

088697a
Raritan, NJ · 2 mi
088367a
Martinsville, NJ · 3 mi
088767a
Somerville, NJ · 3 mi
079787a
Pluckemin, NJ · 4 mi
088357a
Manville, NJ · 4 mi
088907a
Zarephath, NJ · 4 mi
088057a
Bound Brook, NJ · 5 mi
079387a
Liberty Corner, NJ · 5 mi

New Jersey planting zones →

Questions about 08807

What planting zone is ZIP code 08807?

ZIP code 08807 (Bridgewater, 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 Bridgewater, NJ?

The median last spring frost (32 °F) near 08807 is April 30; after May 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Somerville 4 Nw station.

When is the first frost in Bridgewater, NJ?

The median first fall frost near 08807 is October 20, giving a median frost-free growing season of 172 days.

When should I plant tomatoes in 08807?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 08807 get?

About 46.7 inches of precipitation a year (NOAA 1991–2020 normals, Somerville 4 Nw station).

How hot do summers get in Bridgewater, NJ?

The average high peaks at 86 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 08807 have?

The USDA soil survey maps Lansdowne at the center of ZIP 08807: silt loam, somewhat poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Bridgewater, NJ in 2026?

Spring leaf-out near 08807 came on Mar 24 in 2026, 4 days earlier than the 1991–2020 average (Mar 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bridgewater, NJ?

Long-day onions: the longest day near 08807 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 08807 change?

Yes. The 2012 USDA map put 08807 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.