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

Planting zone for 19137 — Philadelphia, PA

ZIP code 19137 (Philadelphia, Philadelphia County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 15 and the first fall frost October 31.

Where ZIP 19137 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 15
First frostOct 31
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 Philadelphia, PA…

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 Philadelphia, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 15median — 50% chance of a later frost
Safe for tender plantsMay 1only 10% chance of frost after
First fall frostOctober 31median — 10% chance by Oct 16
Growing season199 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around November 10.

From the NOAA station Pennsauken 1n, NJ — 3 miles away, elevation 46 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 19137

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 4 – Mar 18
SpinachSow outdoors · Mar 4 – Mar 25
Broccoli, cabbageStart indoors · Feb 4 – Feb 18
Broccoli, cabbageTransplant · Mar 25 – Apr 8
Onion setsPlant outdoors · Mar 18 – Apr 1
PotatoesPlant outdoors · Mar 25 – Apr 8
LettuceSow outdoors · Mar 18 – Apr 1
Carrots, beetsSow outdoors · Mar 25 – Apr 8
TomatoesStart indoors · Feb 18 – Mar 4
TomatoesTransplant · Apr 22 – May 6
Peppers, eggplantStart indoors · Feb 4 – Feb 18
Peppers, eggplantTransplant · Apr 29 – May 13
BeansSow outdoors · Apr 22 – May 6
Sweet cornSow outdoors · Apr 22 – May 6
Cucumbers, squashSow outdoors · Apr 22 – May 6
Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19
GarlicPlant cloves · Oct 17 – Nov 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Oct 31) 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 19137 came on Mar 13 — 4 days earlier than the 1991–2020 average (Mar 17).

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 Pennsylvania

625 plants native to the lower 48 states, recorded in Pennsylvania, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

Trees 79

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 123

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 215

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 licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 182

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °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 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °F

Vines 11

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °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 Philadelphia, PA.

Soil in Philadelphia, PA

The center of ZIP 19137 is mapped as Urban land: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 19137; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Philadelphia, PA

Summer high87 °Faverage high, July
Winter low25 °Faverage low, January
Hot days33days a year at 90 °F or more
Freezing nights103nights a year at 32 °F or less
Growing degree days3,711base 50 °F — the season’s usable heat
Longest day15 h 01 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation48.1 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 40 °F, low 25 °F 40°25° JanFebruary: average high 43 °F, low 26 °F 43°26° FebMarch: average high 52 °F, low 33 °F 52°33° MarApril: average high 64 °F, low 43 °F 64°43° AprMay: average high 73 °F, low 52 °F 73°52° MayJune: average high 82 °F, low 62 °F 82°62° JunJuly: average high 87 °F, low 68 °F 87°68° JulAugust: average high 85 °F, low 66 °F 85°66° AugSeptember: average high 78 °F, low 59 °F 78°59° SepOctober: average high 66 °F, low 47 °F 66°47° OctNovember: average high 55 °F, low 37 °F 55°37° NovDecember: average high 45 °F, low 30 °F 45°30° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.46 in precipitation 3.5 JanFebruary: 2.62 in precipitation 2.6 FebMarch: 4.39 in precipitation 4.4 MarApril: 3.94 in precipitation 3.9 AprMay: 3.88 in precipitation 3.9 MayJune: 4.56 in precipitation 4.6 JunJuly: 5.04 in precipitation 5.0 JulAugust: 4.07 in precipitation 4.1 AugSeptember: 4.32 in precipitation 4.3 SepOctober: 4.07 in precipitation 4.1 OctNovember: 3.29 in precipitation 3.3 NovDecember: 4.49 in precipitation 4.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pennsauken 1n, NJ (3 mi away); precipitation: Pennsauken 1n, NJ (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

081107b
Pennsauken, NJ · 2 mi
191347b
Philadelphia, PA · 2 mi
080657b
Palmyra, NJ · 2 mi
191247b
Philadelphia, PA · 2 mi
191357b
Philadelphia, PA · 2 mi
190197b
Philadelphia, PA · 2 mi
190927b
Philadelphia, PA · 2 mi
190937b
Philadelphia, PA · 2 mi

All 87 ZIP codes in Philadelphia → · Pennsylvania planting zones →

Questions about 19137

What planting zone is ZIP code 19137?

ZIP code 19137 (Philadelphia, PA) 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 Philadelphia, PA?

The median last spring frost (32 °F) near 19137 is April 15; after May 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pennsauken 1n station.

When is the first frost in Philadelphia, PA?

The median first fall frost near 19137 is October 31, giving a median frost-free growing season of 199 days.

When should I plant tomatoes in 19137?

Start tomato seeds indoors around Feb 18 – Mar 4 and set transplants outside around Apr 22 – May 6, one to three weeks after the median last frost.

How much rain and snow does 19137 get?

About 48.1 inches of precipitation a year (NOAA 1991–2020 normals, Pennsauken 1n station).

How hot do summers get in Philadelphia, PA?

The average high peaks at 87 °F in July, with about 33 days a year at 90 °F or more.

Did spring come early in Philadelphia, PA in 2026?

Spring leaf-out near 19137 came on Mar 13 in 2026, 4 days earlier than the 1991–2020 average (Mar 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Philadelphia, PA?

Long-day onions: the longest day near 19137 is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 19137 change?

Yes. The 2012 USDA map put 19137 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.