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

Planting zone for 15728 — Clymer, PA

ZIP code 15728 (Clymer, Indiana County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 8 and the first fall frost October 13.

Where ZIP 15728 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 frostMay 8

First frostOct 13

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 Clymer, 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 Clymer, PA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 8median — 50% chance of a later frost

Safe for tender plantsMay 24only 10% chance of frost after

First fall frostOctober 13median — 10% chance by Oct 1

Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 27 and returns around October 25.

From the NOAA station Indiana 3 Se, PA — 10 miles away, elevation 1,102 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 15728

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 27 – Apr 10

SpinachSow outdoors · Mar 27 – Apr 17

Broccoli, cabbageStart indoors · Feb 27 – Mar 13

Broccoli, cabbageTransplant · Apr 17 – May 1

Onion setsPlant outdoors · Apr 10 – Apr 24

PotatoesPlant outdoors · Apr 17 – May 1

LettuceSow outdoors · Apr 10 – Apr 24

Carrots, beetsSow outdoors · Apr 17 – May 1

TomatoesStart indoors · Mar 13 – Mar 27

TomatoesTransplant · May 15 – May 29

Peppers, eggplantStart indoors · Feb 27 – Mar 13

Peppers, eggplantTransplant · May 22 – Jun 5

BeansSow outdoors · May 15 – May 29

Sweet cornSow outdoors · May 15 – May 29

Cucumbers, squashSow outdoors · May 15 – May 29

Fall lettuce, spinachSow outdoors · Aug 18 – Sep 1

GarlicPlant cloves · Sep 29 – Nov 3

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 8) and first fall frost (Oct 13) 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 15728 came on Mar 12 — 21 days earlier than the 1991–2020 average (Apr 2).

average
Apr 22026
Mar 12

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 Clymer, PA

The soil mapped at the center of ZIP 15728 is Gilpin — channery silt loam, well drained.

TextureChannery silt loama good balance for most vegetables

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.9%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Gilpin channery silt loam, 15 to 25 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 15728; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Clymer, PA

Summer high83 °Faverage high, July

Winter low18 °Faverage low, January

Hot days8days a year at 90 °F or more

Freezing nights131nights a year at 32 °F or less

Growing degree days2,703base 50 °F — the season’s usable heat

Longest day15 h 05 mindaylight on June 21

Shortest day9 h 15 mindaylight on December 21

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

Precipitation47.9 inper year, rain and melted snow

Snowfall46 inper year; 49 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: Indiana 3 Se, PA (10 mi away); precipitation: Indiana 3 Se, PA (10 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.

Dixonville, PA · 4 mi

Pennsylvania planting zones →

Questions about 15728

What planting zone is ZIP code 15728?

ZIP code 15728 (Clymer, 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 Clymer, PA?

The median last spring frost (32 °F) near 15728 is May 8; after May 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Indiana 3 Se station.

When is the first frost in Clymer, PA?

The median first fall frost near 15728 is October 13, giving a median frost-free growing season of 157 days.

When should I plant tomatoes in 15728?

Start tomato seeds indoors around Mar 13 – Mar 27 and set transplants outside around May 15 – May 29, one to three weeks after the median last frost.

How much rain and snow does 15728 get?

About 47.9 inches of precipitation a year and 46 inches of snowfall (NOAA 1991–2020 normals, Indiana 3 Se station).

How hot do summers get in Clymer, PA?

The average high peaks at 83 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 15728 have?

The USDA soil survey maps Gilpin at the center of ZIP 15728: channery silt loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Clymer, PA in 2026?

Spring leaf-out near 15728 came on Mar 12 in 2026, 21 days earlier than the 1991–2020 average (Apr 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Clymer, PA?

Long-day onions: the longest day near 15728 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).