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

Planting zone for 18847 — Susquehanna, PA

ZIP code 18847 (Susquehanna, Susquehanna County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 12 and the first fall frost October 9.

Where ZIP 18847 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 12
First frostOct 9
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Susquehanna, 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 Susquehanna, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 12median — 50% chance of a later frost
Safe for tender plantsMay 27only 10% chance of frost after
First fall frostOctober 9median — 10% chance by Sep 26
Growing season152 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 29 and returns around October 24.

From the NOAA station Deposit, NY — 12 miles away, elevation 1,001 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 18847

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 31 – Apr 14
SpinachSow outdoors · Mar 31 – Apr 21
Broccoli, cabbageStart indoors · Mar 3 – Mar 17
Broccoli, cabbageTransplant · Apr 21 – May 5
Onion setsPlant outdoors · Apr 14 – Apr 28
PotatoesPlant outdoors · Apr 21 – May 5
LettuceSow outdoors · Apr 14 – Apr 28
Carrots, beetsSow outdoors · Apr 21 – May 5
TomatoesStart indoors · Mar 17 – Mar 31
TomatoesTransplant · May 19 – Jun 2
Peppers, eggplantStart indoors · Mar 3 – Mar 17
Peppers, eggplantTransplant · May 26 – Jun 9
BeansSow outdoors · May 19 – Jun 2
Sweet cornSow outdoors · May 19 – Jun 2
Cucumbers, squashSow outdoors · May 19 – Jun 2
Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28
GarlicPlant cloves · Sep 25 – Oct 30
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 12) and first fall frost (Oct 9) 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 18847 came on Apr 9 — 6 days earlier than the 1991–2020 average (Apr 15).

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 5b in Pennsylvania

572 plants native to the lower 48 states, recorded in Pennsylvania, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 75

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 113

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 198

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 166

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 8

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 honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Susquehanna, PA.

Soil in Susquehanna, PA

The soil mapped at the center of ZIP 18847 is Mardin — channery silt loam, moderately well drained.

TextureChannery silt loama good balance for most vegetables
pH6.6neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter10%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Mardin channery silt loam, 8 to 25 percent slopes, very stony.

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 18847; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Susquehanna, PA

Summer high82 °Faverage high, July
Winter low16 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights151nights a year at 32 °F or less
Growing degree days2,565base 50 °F — the season’s usable heat
Longest day15 h 14 mindaylight on June 21
Shortest day9 h 07 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation45.4 inper year, rain and melted snow
Snowfall69 inper year; 72 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 33 °F, low 16 °F 33°16° JanFebruary: average high 36 °F, low 17 °F 36°17° FebMarch: average high 45 °F, low 25 °F 45°25° MarApril: average high 59 °F, low 35 °F 59°35° AprMay: average high 71 °F, low 45 °F 71°45° MayJune: average high 78 °F, low 55 °F 78°55° JunJuly: average high 82 °F, low 59 °F 82°59° JulAugust: average high 80 °F, low 58 °F 80°58° AugSeptember: average high 73 °F, low 51 °F 73°51° SepOctober: average high 62 °F, low 40 °F 62°40° OctNovember: average high 48 °F, low 31 °F 48°31° NovDecember: average high 37 °F, low 23 °F 37°23° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.04 in precipitation, 17.5 in snowfall 3.0❄18 JanFebruary: 2.52 in precipitation, 14.6 in snowfall 2.5❄15 FebMarch: 3.39 in precipitation, 14.5 in snowfall 3.4❄15 MarApril: 3.72 in precipitation, 3.2 in snowfall 3.7❄3 AprMay: 3.93 in precipitation 3.9 MayJune: 4.71 in precipitation 4.7 JunJuly: 4.43 in precipitation 4.4 JulAugust: 4.38 in precipitation 4.4 AugSeptember: 4.50 in precipitation 4.5 SepOctober: 4.27 in precipitation, 0.3 in snowfall 4.3 OctNovember: 3.20 in precipitation, 4.5 in snowfall 3.2❄5 NovDecember: 3.32 in precipitation, 14.4 in snowfall 3.3❄14 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Deposit, NY (12 mi away); precipitation: Susquehanna, PA (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

188276a
Lanesboro, PA · 2 mi
188255b
Jackson, PA · 7 mi
184655b
Thompson, PA · 7 mi
184625b
Starrucca, PA · 8 mi
188216a
Great Bend, PA · 8 mi
138655b
Windsor, NY · 9 mi
188345b
New Milford, PA · 10 mi
184495b
Orson, PA · 10 mi

Pennsylvania planting zones →

Questions about 18847

What planting zone is ZIP code 18847?

ZIP code 18847 (Susquehanna, PA) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Susquehanna, PA?

The median last spring frost (32 °F) near 18847 is May 12; after May 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Deposit station.

When is the first frost in Susquehanna, PA?

The median first fall frost near 18847 is October 9, giving a median frost-free growing season of 152 days.

When should I plant tomatoes in 18847?

Start tomato seeds indoors around Mar 17 – Mar 31 and set transplants outside around May 19 – Jun 2, one to three weeks after the median last frost.

How much rain and snow does 18847 get?

About 45.4 inches of precipitation a year and 69 inches of snowfall (NOAA 1991–2020 normals, Susquehanna station).

How hot do summers get in Susquehanna, PA?

The average high peaks at 82 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 18847 have?

The USDA soil survey maps Mardin at the center of ZIP 18847: channery silt loam, moderately well drained, pH about 6.6 (neutral).

Did spring come early in Susquehanna, PA in 2026?

Spring leaf-out near 18847 came on Apr 9 in 2026, 6 days earlier than the 1991–2020 average (Apr 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Susquehanna, PA?

Long-day onions: the longest day near 18847 is 15 h 14 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).