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

Planting zone for 19464 — Pottstown, PA

ZIP code 19464 (Pottstown, Montgomery County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 20 and the first fall frost October 23.

Where ZIP 19464 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 20

First frostOct 23

2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Pottstown, 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 Pottstown, PA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 20median — 50% chance of a later frost

Safe for tender plantsMay 6only 10% chance of frost after

First fall frostOctober 23median — 10% chance by Oct 9

Growing season186 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 6 and returns around November 3.

From the NOAA station Pottstown Limerick Airport, PA — 3 miles away, elevation 292 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 19464

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 9 – Mar 23

SpinachSow outdoors · Mar 9 – Mar 30

Broccoli, cabbageStart indoors · Feb 9 – Feb 23

Broccoli, cabbageTransplant · Mar 30 – Apr 13

Onion setsPlant outdoors · Mar 23 – Apr 6

PotatoesPlant outdoors · Mar 30 – Apr 13

LettuceSow outdoors · Mar 23 – Apr 6

Carrots, beetsSow outdoors · Mar 30 – Apr 13

TomatoesStart indoors · Feb 23 – Mar 9

TomatoesTransplant · Apr 27 – May 11

Peppers, eggplantStart indoors · Feb 9 – Feb 23

Peppers, eggplantTransplant · May 4 – May 18

BeansSow outdoors · Apr 27 – May 11

Sweet cornSow outdoors · Apr 27 – May 11

Cucumbers, squashSow outdoors · Apr 27 – May 11

Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11

GarlicPlant cloves · Oct 9 – Nov 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 20) and first fall frost (Oct 23) 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 19464 came on Mar 24 — about the same time as the 1991–2020 average (Mar 25).

average
Mar 252026
Mar 24

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 7a in Pennsylvania

620 plants native to the lower 48 states, recorded in Pennsylvania, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

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 Pottstown, PA.

Soil in Pottstown, PA

The soil mapped at the center of ZIP 19464 is Penn — channery silt loam, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureChannery silt loama good balance for most vegetables

pH5.4strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Penn complex, 0 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 19464; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pottstown, PA

Summer high84 °Faverage high, July

Winter low22 °Faverage low, January

Hot days17days a year at 90 °F or more

Freezing nights111nights a year at 32 °F or less

Growing degree days3,108base 50 °F — the season’s usable heat

Longest day15 h 03 mindaylight on June 21

Shortest day9 h 18 mindaylight on December 21

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

Precipitation45.3 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pottstown Limerick Airport, PA (3 mi away); precipitation: Pottstown Limerick Airport, PA (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

195257a

Gilbertsville, PA · 4 mi

194577a

Parker Ford, PA · 4 mi

195487a

Pine Forge, PA · 4 mi

194357a

Frederick, PA · 5 mi

194687a

Royersford, PA · 6 mi

195457a

New Berlinville, PA · 6 mi

194727a

Sassamansville, PA · 6 mi

194657a

Pottstown, PA · 6 mi

All 2 ZIP codes in Pottstown → · Pennsylvania planting zones →

Questions about 19464

What planting zone is ZIP code 19464?

ZIP code 19464 (Pottstown, PA) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Pottstown, PA?

The median last spring frost (32 °F) near 19464 is April 20; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pottstown Limerick Airport station.

When is the first frost in Pottstown, PA?

The median first fall frost near 19464 is October 23, giving a median frost-free growing season of 186 days.

When should I plant tomatoes in 19464?

Start tomato seeds indoors around Feb 23 – Mar 9 and set transplants outside around Apr 27 – May 11, one to three weeks after the median last frost.

How much rain and snow does 19464 get?

About 45.3 inches of precipitation a year (NOAA 1991–2020 normals, Pottstown Limerick Airport station).

How hot do summers get in Pottstown, PA?

The average high peaks at 84 °F in July, with about 17 days a year at 90 °F or more.

What kind of soil does 19464 have?

The USDA soil survey maps Penn at the center of ZIP 19464: channery silt loam, well drained, pH about 5.4 (strongly acidic).

Did spring come early in Pottstown, PA in 2026?

Spring leaf-out near 19464 came on Mar 24 in 2026, about the same as the 1991–2020 average (Mar 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pottstown, PA?

Long-day onions: the longest day near 19464 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 19464 change?

Yes. The 2012 USDA map put 19464 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.