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

Planting zone for 16257 — Snydersburg, PA

ZIP code 16257 (Snydersburg, Clarion County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 13 and the first fall frost October 7.

Where ZIP 16257 is

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 13
First frostOct 7
2012 zone5b

Was 5b 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 6a means →

Frost forecast — next 7 nights

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Loading the forecast for Snydersburg, 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 Snydersburg, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 13median — 50% chance of a later frost
Safe for tender plantsMay 28only 10% chance of frost after
First fall frostOctober 7median — 10% chance by Sep 27
Growing season143 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 2 and returns around October 20.

From the NOAA station Cooksburg 2 Nw, PA — 7 miles away, elevation 1,450 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 16257

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 1 – Apr 15
SpinachSow outdoors · Apr 1 – Apr 22
Broccoli, cabbageStart indoors · Mar 4 – Mar 18
Broccoli, cabbageTransplant · Apr 22 – May 6
Onion setsPlant outdoors · Apr 15 – Apr 29
PotatoesPlant outdoors · Apr 22 – May 6
LettuceSow outdoors · Apr 15 – Apr 29
Carrots, beetsSow outdoors · Apr 22 – May 6
TomatoesStart indoors · Mar 18 – Apr 1
TomatoesTransplant · May 20 – Jun 3
Peppers, eggplantStart indoors · Mar 4 – Mar 18
Peppers, eggplantTransplant · May 27 – Jun 10
BeansSow outdoors · May 20 – Jun 3
Sweet cornSow outdoors · May 20 – Jun 3
Cucumbers, squashSow outdoors · May 20 – Jun 3
Fall lettuce, spinachSow outdoors · Aug 12 – Aug 26
GarlicPlant cloves · Sep 23 – Oct 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 13) and first fall frost (Oct 7) 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 16257 came on Mar 25 — 16 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 Snydersburg, PA.

Soil in Snydersburg, PA

The soil mapped at the center of ZIP 16257 is Cavode — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Cavode silt loam, 3 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 16257; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Snydersburg, PA

Summer high80 °Faverage high, July
Winter low13 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights166nights a year at 32 °F or less
Growing degree days2,126base 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)
Precipitation46.4 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 31 °F, low 13 °F 31°13° JanFebruary: average high 35 °F, low 14 °F 35°14° FebMarch: average high 44 °F, low 21 °F 44°21° MarApril: average high 59 °F, low 31 °F 59°31° AprMay: average high 69 °F, low 42 °F 69°42° MayJune: average high 76 °F, low 52 °F 76°52° JunJuly: average high 80 °F, low 55 °F 80°55° JulAugust: average high 79 °F, low 54 °F 79°54° AugSeptember: average high 72 °F, low 47 °F 72°47° SepOctober: average high 60 °F, low 37 °F 60°37° OctNovember: average high 48 °F, low 28 °F 48°28° NovDecember: average high 37 °F, low 20 °F 37°20° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.45 in precipitation 3.5 JanFebruary: 2.58 in precipitation 2.6 FebMarch: 3.41 in precipitation 3.4 MarApril: 3.94 in precipitation 3.9 AprMay: 4.28 in precipitation 4.3 MayJune: 5.25 in precipitation 5.3 JunJuly: 4.74 in precipitation 4.7 JulAugust: 3.97 in precipitation 4.0 AugSeptember: 4.01 in precipitation 4.0 SepOctober: 4.00 in precipitation 4.0 OctNovember: 3.48 in precipitation 3.5 NovDecember: 3.24 in precipitation 3.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cooksburg 2 Nw, PA (7 mi away); precipitation: Tionesta 7.3 Sse, PA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

163326a
Lickingville, PA · 2 mi
162356a
Lucinda, PA · 2 mi
163616a
Tylersburg, PA · 4 mi
162336a
Leeper, PA · 4 mi
163266a
Fryburg, PA · 5 mi
163346a
Marble, PA · 5 mi
162546a
Shippenville, PA · 7 mi
162206a
Crown, PA · 7 mi

Pennsylvania planting zones →

Questions about 16257

What planting zone is ZIP code 16257?

ZIP code 16257 (Snydersburg, 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 Snydersburg, PA?

The median last spring frost (32 °F) near 16257 is May 13; after May 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cooksburg 2 Nw station.

When is the first frost in Snydersburg, PA?

The median first fall frost near 16257 is October 7, giving a median frost-free growing season of 143 days.

When should I plant tomatoes in 16257?

Start tomato seeds indoors around Mar 18 – Apr 1 and set transplants outside around May 20 – Jun 3, one to three weeks after the median last frost.

How much rain and snow does 16257 get?

About 46.4 inches of precipitation a year (NOAA 1991–2020 normals, Tionesta 7.3 Sse station).

How hot do summers get in Snydersburg, PA?

The average high peaks at 80 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 16257 have?

The USDA soil survey maps Cavode at the center of ZIP 16257: silt loam, somewhat poorly drained, pH about 5.6 (moderately acidic).

Did spring come early in Snydersburg, PA in 2026?

Spring leaf-out near 16257 came on Mar 25 in 2026, 16 days earlier than the 1991–2020 average (Apr 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Snydersburg, PA?

Long-day onions: the longest day near 16257 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 16257 change?

Yes. The 2012 USDA map put 16257 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.