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

Planting zone for Conshohocken, PA

Conshohocken, PA is in USDA zone 7b across its 2 ZIP codes. The median last spring frost is April 8 and the first fall frost October 31.

Conshohocken on the zone map

Outlined: its 1 ZIP code areas · 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.

Zone7b5 to 10 °F
ZIP codes2
Last frostApr 8
First frostOct 31
Growing season203 days

7b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Conshohocken, 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 Conshohocken, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 8median — 50% chance of a later frost
Safe for tender plantsApril 23only 10% chance of frost after
First fall frostOctober 31median — 10% chance by Oct 14
Growing season203 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 10.

From the NOAA station Norristown, PA, elevation 62 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 Conshohocken

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 25 – Mar 11
SpinachSow outdoors · Feb 25 – Mar 18
Broccoli, cabbageStart indoors · Jan 28 – Feb 11
Broccoli, cabbageTransplant · Mar 18 – Apr 1
Onion setsPlant outdoors · Mar 11 – Mar 25
PotatoesPlant outdoors · Mar 18 – Apr 1
LettuceSow outdoors · Mar 11 – Mar 25
Carrots, beetsSow outdoors · Mar 18 – Apr 1
TomatoesStart indoors · Feb 11 – Feb 25
TomatoesTransplant · Apr 15 – Apr 29
Peppers, eggplantStart indoors · Jan 28 – Feb 11
Peppers, eggplantTransplant · Apr 22 – May 6
BeansSow outdoors · Apr 15 – Apr 29
Sweet cornSow outdoors · Apr 15 – Apr 29
Cucumbers, squashSow outdoors · Apr 15 – Apr 29
Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19
GarlicPlant cloves · Oct 17 – Nov 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 8) and first fall frost (Oct 31) 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 19428 came on Mar 15 — 6 days earlier than the 1991–2020 average (Mar 21).

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 7b in Pennsylvania

625 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 7b. Each links to its USDA PLANTS profile.

Trees 79

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 123

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 215

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 182

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 11

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °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 °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 Conshohocken, PA.

Soil in Conshohocken, PA

The soil mapped at the center of ZIP 19428 is Udorthents — clay loam, moderately well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureClay loamholds water and nutrients; slow to drain and warm up
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Udorthents, limestone complex, 8 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 19428; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Conshohocken, PA

Summer high89 °Faverage high, July
Winter low23 °Faverage low, January
Hot days39days a year at 90 °F or more
Freezing nights107nights a year at 32 °F or less
Growing degree days3,815base 50 °F — the season’s usable heat
Longest day15 h 01 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)
Precipitation49.7 inper year, rain and melted snow
Snowfall8 inper year; 9 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 23 °F 42°23° JanFebruary: average high 44 °F, low 25 °F 44°25° FebMarch: average high 52 °F, low 32 °F 52°32° MarApril: average high 65 °F, low 42 °F 65°42° AprMay: average high 75 °F, low 52 °F 75°52° MayJune: average high 84 °F, low 62 °F 84°62° JunJuly: average high 89 °F, low 67 °F 89°67° JulAugust: average high 87 °F, low 65 °F 87°65° AugSeptember: average high 80 °F, low 58 °F 80°58° SepOctober: average high 68 °F, low 45 °F 68°45° OctNovember: average high 57 °F, low 35 °F 57°35° NovDecember: average high 46 °F, low 28 °F 46°28° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.75 in precipitation, 2.7 in snowfall 3.8❄3 JanFebruary: 2.76 in precipitation, 2.4 in snowfall 2.8❄2 FebMarch: 4.58 in precipitation, 0.6 in snowfall 4.6❄1 MarApril: 3.68 in precipitation, 0.1 in snowfall 3.7 AprMay: 4.01 in precipitation 4.0 MayJune: 4.24 in precipitation 4.2 JunJuly: 4.50 in precipitation 4.5 JulAugust: 5.06 in precipitation 5.1 AugSeptember: 4.57 in precipitation 4.6 SepOctober: 4.37 in precipitation 4.4 OctNovember: 3.56 in precipitation, 0.2 in snowfall 3.6 NovDecember: 4.62 in precipitation, 1.6 in snowfall 4.6❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Norristown, PA (2 mi away); precipitation: Conshohocken, PA (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Conshohocken

194287b
5 to 10 °F
194297b
5 to 10 °F

Pennsylvania planting zones →

Questions about Conshohocken

What planting zone is Conshohocken, PA?

Conshohocken, PA is in USDA hardiness zone 7b on the 2023 map (7b: 5 to 10 °F).

When is the last frost in Conshohocken, PA?

The median last spring frost is April 8 and the median first fall frost is October 31 (NOAA 1991–2020 normals, Norristown station).

When can I plant a garden in Conshohocken, PA?

Cool-season crops like peas and spinach go in around Feb 25 – Mar 18; tomatoes, peppers, beans and squash after about Apr 15, once frost risk has passed.

What kind of onions grow in Conshohocken, PA?

Long-day onions: the longest day is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Conshohocken, PA get?

About 49.7 inches of precipitation a year and 8 inches of snowfall (NOAA 1991–2020 normals).