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

Planting zone for 15476 — Ronco, PA

ZIP code 15476 (Ronco, Fayette County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 28 and the first fall frost October 21.

Where ZIP 15476 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 28
First frostOct 21
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Ronco, 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 Ronco, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 28median — 50% chance of a later frost
Safe for tender plantsMay 14only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 9
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around October 31.

From the NOAA station Grays Landing, PA — 6 miles away, elevation 801 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 15476

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 17 – Mar 31
SpinachSow outdoors · Mar 17 – Apr 7
Broccoli, cabbageStart indoors · Feb 17 – Mar 3
Broccoli, cabbageTransplant · Apr 7 – Apr 21
Onion setsPlant outdoors · Mar 31 – Apr 14
PotatoesPlant outdoors · Apr 7 – Apr 21
LettuceSow outdoors · Mar 31 – Apr 14
Carrots, beetsSow outdoors · Apr 7 – Apr 21
TomatoesStart indoors · Mar 3 – Mar 17
TomatoesTransplant · May 5 – May 19
Peppers, eggplantStart indoors · Feb 17 – Mar 3
Peppers, eggplantTransplant · May 12 – May 26
BeansSow outdoors · May 5 – May 19
Sweet cornSow outdoors · May 5 – May 19
Cucumbers, squashSow outdoors · May 5 – May 19
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 28) 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 15476 came on Mar 9 — 14 days earlier than the 1991–2020 average (Mar 23).

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.

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 122

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 209

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 173

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 10

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 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °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 Ronco, PA.

Soil in Ronco, PA

The soil mapped at the center of ZIP 15476 is Dormont — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH6.2slightly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2.6%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Dormont-Culleoka complex, 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 15476; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ronco, PA

Summer high84 °Faverage high, July
Winter low21 °Faverage low, January
Hot days14days a year at 90 °F or more
Freezing nights124nights a year at 32 °F or less
Growing degree days3,105base 50 °F — the season’s usable heat
Longest day15 h 00 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation42.1 inper year, rain and melted snow
Snowfall18 inper year; 25 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 39 °F, low 21 °F 39°21° JanFebruary: average high 42 °F, low 22 °F 42°22° FebMarch: average high 51 °F, low 28 °F 51°28° MarApril: average high 64 °F, low 37 °F 64°37° AprMay: average high 73 °F, low 48 °F 73°48° MayJune: average high 81 °F, low 57 °F 81°57° JunJuly: average high 84 °F, low 62 °F 84°62° JulAugust: average high 83 °F, low 61 °F 83°61° AugSeptember: average high 77 °F, low 54 °F 77°54° SepOctober: average high 65 °F, low 42 °F 65°42° OctNovember: average high 53 °F, low 31 °F 53°31° NovDecember: average high 43 °F, low 25 °F 43°25° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.25 in precipitation, 6.1 in snowfall 3.3❄6 JanFebruary: 2.56 in precipitation, 5.9 in snowfall 2.6❄6 FebMarch: 3.63 in precipitation, 1.9 in snowfall 3.6❄2 MarApril: 3.77 in precipitation, 0.1 in snowfall 3.8 AprMay: 4.09 in precipitation 4.1 MayJune: 4.33 in precipitation 4.3 JunJuly: 4.22 in precipitation 4.2 JulAugust: 3.65 in precipitation 3.6 AugSeptember: 3.44 in precipitation 3.4 SepOctober: 3.00 in precipitation 3.0 OctNovember: 2.98 in precipitation, 0.3 in snowfall 3.0 NovDecember: 3.23 in precipitation, 4.1 in snowfall 3.2❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Grays Landing, PA (6 mi away); precipitation: Grays Landing, PA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

153517a
Nemacolin, PA · <1 mi
154616b
Masontown, PA · 2 mi
154107a
Adah, PA · 3 mi
154546b
Leckrone, PA · 3 mi
153206b
Carmichaels, PA · 4 mi
153386b
Greensboro, PA · 4 mi
154586b
Mc Clellandtown, PA · 4 mi
154437a
Hibbs, PA · 4 mi

Pennsylvania planting zones →

Questions about 15476

What planting zone is ZIP code 15476?

ZIP code 15476 (Ronco, 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 Ronco, PA?

The median last spring frost (32 °F) near 15476 is April 28; after May 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Grays Landing station.

When is the first frost in Ronco, PA?

The median first fall frost near 15476 is October 21, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 15476?

Start tomato seeds indoors around Mar 3 – Mar 17 and set transplants outside around May 5 – May 19, one to three weeks after the median last frost.

How much rain and snow does 15476 get?

About 42.1 inches of precipitation a year and 18 inches of snowfall (NOAA 1991–2020 normals, Grays Landing station).

How hot do summers get in Ronco, PA?

The average high peaks at 84 °F in July, with about 14 days a year at 90 °F or more.

What kind of soil does 15476 have?

The USDA soil survey maps Dormont at the center of ZIP 15476: silt loam, moderately well drained, pH about 6.2 (slightly acidic).

Did spring come early in Ronco, PA in 2026?

Spring leaf-out near 15476 came on Mar 9 in 2026, 14 days earlier than the 1991–2020 average (Mar 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ronco, PA?

Long-day onions: the longest day near 15476 is 15 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).