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

Planting zone for 17778 — Westport, PA

ZIP code 17778 (Westport, Clinton County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 29 and the first fall frost October 21.

Where ZIP 17778 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 29
First frostOct 21
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Westport, 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 Westport, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 29median — 50% chance of a later frost
Safe for tender plantsMay 14only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 6
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around November 2.

From the NOAA station Alvin R Bush Dam, PA — 5 miles away, elevation 932 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 17778

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 18 – Apr 1
SpinachSow outdoors · Mar 18 – Apr 8
Broccoli, cabbageStart indoors · Feb 18 – Mar 4
Broccoli, cabbageTransplant · Apr 8 – Apr 22
Onion setsPlant outdoors · Apr 1 – Apr 15
PotatoesPlant outdoors · Apr 8 – Apr 22
LettuceSow outdoors · Apr 1 – Apr 15
Carrots, beetsSow outdoors · Apr 8 – Apr 22
TomatoesStart indoors · Mar 4 – Mar 18
TomatoesTransplant · May 6 – May 20
Peppers, eggplantStart indoors · Feb 18 – Mar 4
Peppers, eggplantTransplant · May 13 – May 27
BeansSow outdoors · May 6 – May 20
Sweet cornSow outdoors · May 6 – May 20
Cucumbers, squashSow outdoors · May 6 – May 20
Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Oct 21) 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 17778 came on Apr 1 — 9 days earlier than the 1991–2020 average (Apr 10).

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 6a in Pennsylvania

598 plants native to the lower 48 states, recorded in Pennsylvania, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Trees 76

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 121

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 207

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 170

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 9

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °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 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °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 Westport, PA.

Soil in Westport, PA

The soil mapped at the center of ZIP 17778 is Linden — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupAwater soaks in fast
Farmland classprime farmlandUSDA classification

Map unit: Linden silt loam, rarely flooded.

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 17778; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Westport, PA

Summer high82 °Faverage high, July
Winter low18 °Faverage low, January
Hot days9days a year at 90 °F or more
Freezing nights135nights a year at 32 °F or less
Growing degree days2,554base 50 °F — the season’s usable heat
Longest day15 h 10 mindaylight on June 21
Shortest day9 h 11 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation43.5 inper year, rain and melted snow
Snowfall38 inper year; 53 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 34 °F, low 18 °F 34°18° JanFebruary: average high 38 °F, low 18 °F 38°18° FebMarch: average high 47 °F, low 25 °F 47°25° MarApril: average high 59 °F, low 35 °F 59°35° AprMay: average high 70 °F, low 47 °F 70°47° MayJune: average high 78 °F, low 55 °F 78°55° JunJuly: average high 82 °F, low 60 °F 82°60° JulAugust: average high 80 °F, low 59 °F 80°59° AugSeptember: average high 74 °F, low 52 °F 74°52° SepOctober: average high 61 °F, low 42 °F 61°42° OctNovember: average high 49 °F, low 31 °F 49°31° NovDecember: average high 38 °F, low 26 °F 38°26° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.03 in precipitation, 11.7 in snowfall 3.0❄12 JanFebruary: 2.56 in precipitation, 10.2 in snowfall 2.6❄10 FebMarch: 3.55 in precipitation, 5.6 in snowfall 3.5❄6 MarApril: 3.95 in precipitation, 0.5 in snowfall 4.0❄1 AprMay: 3.73 in precipitation 3.7 MayJune: 3.73 in precipitation 3.7 JunJuly: 4.29 in precipitation 4.3 JulAugust: 4.22 in precipitation 4.2 AugSeptember: 4.02 in precipitation 4.0 SepOctober: 3.70 in precipitation 3.7 OctNovember: 3.39 in precipitation, 2.1 in snowfall 3.4❄2 NovDecember: 3.34 in precipitation, 7.6 in snowfall 3.3❄8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Alvin R Bush Dam, PA (5 mi away); precipitation: Sinnemahoning, PA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

158616a
Sinnamahoning, PA · 5 mi
168716a
Pottersdale, PA · 8 mi
177646a
Renovo, PA · 9 mi
158326a
Driftwood, PA · 12 mi
168456a
Karthaus, PA · 13 mi
168646b
Orviston, PA · 14 mi
168296a
Clarence, PA · 15 mi
168596a
Moshannon, PA · 18 mi

Pennsylvania planting zones →

Questions about 17778

What planting zone is ZIP code 17778?

ZIP code 17778 (Westport, PA) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Westport, PA?

The median last spring frost (32 °F) near 17778 is April 29; after May 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Alvin R Bush Dam station.

When is the first frost in Westport, PA?

The median first fall frost near 17778 is October 21, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 17778?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 17778 get?

About 43.5 inches of precipitation a year and 38 inches of snowfall (NOAA 1991–2020 normals, Sinnemahoning station).

How hot do summers get in Westport, PA?

The average high peaks at 82 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 17778 have?

The USDA soil survey maps Linden at the center of ZIP 17778: silt loam, well drained, pH about 5.8 (moderately acidic).

Did spring come early in Westport, PA in 2026?

Spring leaf-out near 17778 came on Apr 1 in 2026, 9 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Westport, PA?

Long-day onions: the longest day near 17778 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).