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

Planting zone for 07023 — Fanwood, NJ

ZIP code 07023 (Fanwood, Union 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 07023 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 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 Fanwood, 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 Fanwood, 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 — 2 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 07023

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 07023 came on Mar 22 — about the same time as the 1991–2020 average (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.

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 Fanwood, NJ.

Soil in Fanwood, NJ

The soil mapped at the center of ZIP 07023 is Haledon — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Haledon-Urban land-Hasbrouck complex, 0 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 07023; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fanwood, 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 15 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation48.7 inper year, rain and melted snow
Snowfall21 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 41 °F, low 24 °F 41°24° JanFebruary: average high 44 °F, low 26 °F 44°26° FebMarch: average high 53 °F, low 32 °F 53°32° MarApril: average high 66 °F, low 42 °F 66°42° AprMay: average high 75 °F, low 51 °F 75°51° MayJune: average high 84 °F, low 60 °F 84°60° JunJuly: average high 88 °F, low 66 °F 88°66° JulAugust: average high 86 °F, low 64 °F 86°64° AugSeptember: average high 79 °F, low 58 °F 79°58° SepOctober: average high 66 °F, low 46 °F 66°46° OctNovember: average high 56 °F, low 36 °F 56°36° NovDecember: average high 46 °F, low 29 °F 46°29° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.79 in precipitation, 5.1 in snowfall 3.8❄5 JanFebruary: 3.14 in precipitation, 8.3 in snowfall 3.1❄8 FebMarch: 4.27 in precipitation, 5.3 in snowfall 4.3❄5 MarApril: 3.60 in precipitation, 0.1 in snowfall 3.6 AprMay: 4.01 in precipitation 4.0 MayJune: 4.33 in precipitation 4.3 JunJuly: 5.34 in precipitation 5.3 JulAugust: 3.99 in precipitation 4.0 AugSeptember: 4.27 in precipitation 4.3 SepOctober: 4.31 in precipitation 4.3 OctNovember: 3.48 in precipitation, 0.2 in snowfall 3.5 NovDecember: 4.19 in precipitation, 2.4 in snowfall 4.2❄2 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

070767a
Scotch Plains, NJ · <1 mi
070627a
Plainfield, NJ · 1 mi
070907a
Westfield, NJ · 2 mi
070607a
Plainfield, NJ · 3 mi
070697a
Watchung, NJ · 3 mi
070927a
Mountainside, NJ · 3 mi
079227a
Berkeley Heights, NJ · 3 mi
070277a
Garwood, NJ · 3 mi

New Jersey planting zones →

Questions about 07023

What planting zone is ZIP code 07023?

ZIP code 07023 (Fanwood, 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 Fanwood, NJ?

The median last spring frost (32 °F) near 07023 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 Fanwood, NJ?

The median first fall frost near 07023 is October 28, giving a median frost-free growing season of 198 days.

When should I plant tomatoes in 07023?

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 07023 get?

About 48.7 inches of precipitation a year and 21 inches of snowfall (NOAA 1991–2020 normals, Plainfield station).

How hot do summers get in Fanwood, 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 07023 have?

The USDA soil survey maps Haledon at the center of ZIP 07023: loam, somewhat poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Fanwood, NJ in 2026?

Spring leaf-out near 07023 came on Mar 22 in 2026, about the same as the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Fanwood, NJ?

Long-day onions: the longest day near 07023 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).