Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 16136 — Koppel, PA

ZIP code 16136 (Koppel, Beaver County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 27 and the first fall frost October 25.

Where ZIP 16136 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.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostApr 27

First frostOct 25

2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Koppel, 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 Koppel, PA

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 27median — 50% chance of a later frost

Safe for tender plantsMay 16only 10% chance of frost after

First fall frostOctober 25median — 10% chance by Oct 7

Growing season178 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 17 and returns around November 5.

From the NOAA station Beaver Falls 1 Ne, PA — 5 miles away, elevation 761 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 16136

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 16 – Mar 30

SpinachSow outdoors · Mar 16 – Apr 6

Broccoli, cabbageStart indoors · Feb 16 – Mar 2

Broccoli, cabbageTransplant · Apr 6 – Apr 20

Onion setsPlant outdoors · Mar 30 – Apr 13

PotatoesPlant outdoors · Apr 6 – Apr 20

LettuceSow outdoors · Mar 30 – Apr 13

Carrots, beetsSow outdoors · Apr 6 – Apr 20

TomatoesStart indoors · Mar 2 – Mar 16

TomatoesTransplant · May 4 – May 18

Peppers, eggplantStart indoors · Feb 16 – Mar 2

Peppers, eggplantTransplant · May 11 – May 25

BeansSow outdoors · May 4 – May 18

Sweet cornSow outdoors · May 4 – May 18

Cucumbers, squashSow outdoors · May 4 – May 18

Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13

GarlicPlant cloves · Oct 11 – Nov 15

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Oct 25) 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 16136 came on Mar 11 — 20 days earlier than the 1991–2020 average (Mar 31).

average
Mar 312026
Mar 11

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 6b in Pennsylvania

605 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 6b. Each links to its USDA PLANTS profile.

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 Koppel, PA.

Soil in Koppel, PA

The soil mapped at the center of ZIP 16136 is Conotton — gravelly loam, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureGravelly loama good balance for most vegetables

pH5.6moderately acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.75%moderate

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Conotton 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 16136; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Koppel, PA

Summer high83 °Faverage high, July

Winter low19 °Faverage low, January

Hot days10days a year at 90 °F or more

Freezing nights131nights a year at 32 °F or less

Growing degree days2,906base 50 °F — the season’s usable heat

Longest day15 h 06 mindaylight on June 21

Shortest day9 h 14 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation40.3 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Beaver Falls 1 Ne, PA (5 mi away); precipitation: Beaver Falls 1 Ne, PA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

161576b

Wampum, PA · 4 mi

161176b

Ellwood City, PA · 4 mi

150106b

Beaver Falls, PA · 5 mi

161416b

New Galilee, PA · 5 mi

161236b

Fombell, PA · 7 mi

161606b

West Pittsburg, PA · 7 mi

150666b

New Brighton, PA · 7 mi

161156b

Darlington, PA · 8 mi

Pennsylvania planting zones →

Questions about 16136

What planting zone is ZIP code 16136?

ZIP code 16136 (Koppel, PA) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Koppel, PA?

The median last spring frost (32 °F) near 16136 is April 27; after May 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Beaver Falls 1 Ne station.

When is the first frost in Koppel, PA?

The median first fall frost near 16136 is October 25, giving a median frost-free growing season of 178 days.

When should I plant tomatoes in 16136?

Start tomato seeds indoors around Mar 2 – Mar 16 and set transplants outside around May 4 – May 18, one to three weeks after the median last frost.

How much rain and snow does 16136 get?

About 40.3 inches of precipitation a year (NOAA 1991–2020 normals, Beaver Falls 1 Ne station).

How hot do summers get in Koppel, PA?

The average high peaks at 83 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 16136 have?

The USDA soil survey maps Conotton at the center of ZIP 16136: gravelly loam, well drained, pH about 5.6 (moderately acidic).

Did spring come early in Koppel, PA in 2026?

Spring leaf-out near 16136 came on Mar 11 in 2026, 20 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Koppel, PA?

Long-day onions: the longest day near 16136 is 15 h 06 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 16136 change?

Yes. The 2012 USDA map put 16136 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.