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

Planting zone for 15201 — Pittsburgh, PA

ZIP code 15201 (Pittsburgh, Allegheny County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 16 and the first fall frost November 1.

Where ZIP 15201 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 16
First frostNov 1
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 Pittsburgh, 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 Pittsburgh, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 4only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 18
Growing season197 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 11.

From the NOAA station Acmetonia Lock 3, PA — 7 miles away, elevation 748 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 15201

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
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 16) 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 15201 came on Mar 10 — 16 days earlier than the 1991–2020 average (Mar 26).

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 Pennsylvania

620 plants native to the lower 48 states, recorded in Pennsylvania, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 78

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 212

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 181

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 Pittsburgh, PA.

Soil in Pittsburgh, PA

The soil mapped at the center of ZIP 15201 is Rainsboro — silt loam, moderately well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureSilt loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Rainsboro complex, sloping.

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 15201; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pittsburgh, PA

Summer high83 °Faverage high, July
Winter low19 °Faverage low, January
Hot days15days a year at 90 °F or more
Freezing nights117nights a year at 32 °F or less
Growing degree days3,002base 50 °F — the season’s usable heat
Longest day15 h 04 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)
Precipitation44.5 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 36 °F, low 19 °F 36°19° JanFebruary: average high 40 °F, low 21 °F 40°21° FebMarch: average high 49 °F, low 28 °F 49°28° MarApril: average high 62 °F, low 38 °F 62°38° AprMay: average high 72 °F, low 49 °F 72°49° MayJune: average high 79 °F, low 58 °F 79°58° JunJuly: average high 83 °F, low 62 °F 83°62° JulAugust: average high 82 °F, low 61 °F 82°61° AugSeptember: average high 76 °F, low 54 °F 76°54° SepOctober: average high 64 °F, low 43 °F 64°43° OctNovember: average high 51 °F, low 32 °F 51°32° NovDecember: average high 42 °F, low 26 °F 42°26° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.38 in precipitation 3.4 JanFebruary: 2.87 in precipitation 2.9 FebMarch: 3.68 in precipitation 3.7 MarApril: 3.70 in precipitation 3.7 AprMay: 3.91 in precipitation 3.9 MayJune: 4.45 in precipitation 4.5 JunJuly: 4.54 in precipitation 4.5 JulAugust: 3.56 in precipitation 3.6 AugSeptember: 4.18 in precipitation 4.2 SepOctober: 3.32 in precipitation 3.3 OctNovember: 3.26 in precipitation 3.3 NovDecember: 3.66 in precipitation 3.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Acmetonia Lock 3, PA (7 mi away); precipitation: Acmetonia Lock 3, PA (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

152246b
Pittsburgh, PA · 1 mi
152236b
Pittsburgh, PA · 2 mi
152066b
Pittsburgh, PA · 2 mi
152096b
Pittsburgh, PA · 2 mi
152156b
Pittsburgh, PA · 2 mi
152326b
Pittsburgh, PA · 2 mi
152896b
Pittsburgh, PA · 3 mi
152606b
Pittsburgh, PA · 3 mi

All 72 ZIP codes in Pittsburgh → · Pennsylvania planting zones →

Questions about 15201

What planting zone is ZIP code 15201?

ZIP code 15201 (Pittsburgh, PA) 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 Pittsburgh, PA?

The median last spring frost (32 °F) near 15201 is April 16; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Acmetonia Lock 3 station.

When is the first frost in Pittsburgh, PA?

The median first fall frost near 15201 is November 1, giving a median frost-free growing season of 197 days.

When should I plant tomatoes in 15201?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 15201 get?

About 44.5 inches of precipitation a year (NOAA 1991–2020 normals, Acmetonia Lock 3 station).

How hot do summers get in Pittsburgh, PA?

The average high peaks at 83 °F in July, with about 15 days a year at 90 °F or more.

What kind of soil does 15201 have?

The USDA soil survey maps Rainsboro at the center of ZIP 15201: silt loam, moderately well drained, pH about 5.9 (moderately acidic).

Did spring come early in Pittsburgh, PA in 2026?

Spring leaf-out near 15201 came on Mar 10 in 2026, 16 days earlier than the 1991–2020 average (Mar 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pittsburgh, PA?

Long-day onions: the longest day near 15201 is 15 h 04 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 15201 change?

Yes. The 2012 USDA map put 15201 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.