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

Planting zone for 17271 — Willow Hill, PA

ZIP code 17271 (Willow Hill, Franklin County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 18 and the first fall frost October 25.

Where ZIP 17271 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 18

First frostOct 25

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 Willow Hill, 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 Willow Hill, PA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 18median — 50% chance of a later frost

Safe for tender plantsMay 5only 10% chance of frost after

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

Growing season188 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 6.

From the NOAA station Chambersburg 1 Ese, PA — 14 miles away, elevation 640 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 17271

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 7 – Mar 21

SpinachSow outdoors · Mar 7 – Mar 28

Broccoli, cabbageStart indoors · Feb 7 – Feb 21

Broccoli, cabbageTransplant · Mar 28 – Apr 11

Onion setsPlant outdoors · Mar 21 – Apr 4

PotatoesPlant outdoors · Mar 28 – Apr 11

LettuceSow outdoors · Mar 21 – Apr 4

Carrots, beetsSow outdoors · Mar 28 – Apr 11

TomatoesStart indoors · Feb 21 – Mar 7

TomatoesTransplant · Apr 25 – May 9

Peppers, eggplantStart indoors · Feb 7 – Feb 21

Peppers, eggplantTransplant · May 2 – May 16

BeansSow outdoors · Apr 25 – May 9

Sweet cornSow outdoors · Apr 25 – May 9

Cucumbers, squashSow outdoors · Apr 25 – May 9

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 18) 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 17271 came on Mar 22 — 9 days earlier than the 1991–2020 average (Mar 31).

average
Mar 312026
Mar 22

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).

Soil in Willow Hill, PA

The soil mapped at the center of ZIP 17271 is Hagerstown — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Hagerstown-Carbo silty clay loams, 8 to 15 percent slopes, very rocky.

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 17271; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Willow Hill, PA

Summer high85 °Faverage high, July

Winter low23 °Faverage low, January

Hot days19days a year at 90 °F or more

Freezing nights109nights a year at 32 °F or less

Growing degree days3,351base 50 °F — the season’s usable heat

Longest day15 h 02 mindaylight on June 21

Shortest day9 h 19 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

Snowfall31 inper year; 31 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Chambersburg 1 Ese, PA (14 mi away); precipitation: Chambersburg 1 Ese, PA (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

172627a

Spring Run, PA · 3 mi

172397a

Neelyton, PA · 3 mi

172217a

Fannettsburg, PA · 4 mi

172157a

Burnt Cabins, PA · 4 mi

172557a

Shade Gap, PA · 5 mi

172657a

Upperstrasburg, PA · 5 mi

Pennsylvania planting zones →

Questions about 17271

What planting zone is ZIP code 17271?

ZIP code 17271 (Willow Hill, 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 Willow Hill, PA?

The median last spring frost (32 °F) near 17271 is April 18; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Chambersburg 1 Ese station.

When is the first frost in Willow Hill, PA?

The median first fall frost near 17271 is October 25, giving a median frost-free growing season of 188 days.

When should I plant tomatoes in 17271?

Start tomato seeds indoors around Feb 21 – Mar 7 and set transplants outside around Apr 25 – May 9, one to three weeks after the median last frost.

How much rain and snow does 17271 get?

About 43.5 inches of precipitation a year and 31 inches of snowfall (NOAA 1991–2020 normals, Chambersburg 1 Ese station).

How hot do summers get in Willow Hill, PA?

The average high peaks at 85 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 17271 have?

The USDA soil survey maps Hagerstown at the center of ZIP 17271: silty clay loam, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Willow Hill, PA in 2026?

Spring leaf-out near 17271 came on Mar 22 in 2026, 9 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Willow Hill, PA?

Long-day onions: the longest day near 17271 is 15 h 02 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 17271 change?

Yes. The 2012 USDA map put 17271 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.