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

Planting zone for 19342 — Glen Mills, PA

ZIP code 19342 (Glen Mills, Delaware County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is March 30 and the first fall frost November 16.

Where ZIP 19342 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 frostMar 30
First frostNov 16
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Glen Mills, 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 Glen Mills, PA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 30median — 50% chance of a later frost
Safe for tender plantsApril 9only 10% chance of frost after
First fall frostNovember 16median — 10% chance by Nov 2
Growing season230 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 20 and returns around November 28.

From the NOAA station Marcus Hook, PA — 7 miles away, elevation 10 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 19342

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 16 – Mar 2
SpinachSow outdoors · Feb 16 – Mar 9
Broccoli, cabbageStart indoors · Jan 19 – Feb 2
Broccoli, cabbageTransplant · Mar 9 – Mar 23
Onion setsPlant outdoors · Mar 2 – Mar 16
PotatoesPlant outdoors · Mar 9 – Mar 23
LettuceSow outdoors · Mar 2 – Mar 16
Carrots, beetsSow outdoors · Mar 9 – Mar 23
TomatoesStart indoors · Feb 2 – Feb 16
TomatoesTransplant · Apr 6 – Apr 20
Peppers, eggplantStart indoors · Jan 19 – Feb 2
Peppers, eggplantTransplant · Apr 13 – Apr 27
BeansSow outdoors · Apr 6 – Apr 20
Sweet cornSow outdoors · Apr 6 – Apr 20
Cucumbers, squashSow outdoors · Apr 6 – Apr 20
Fall lettuce, spinachSow outdoors · Sep 21 – Oct 5
GarlicPlant cloves · Nov 2 – Dec 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 30) and first fall frost (Nov 16) 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 19342 came on Mar 24 — about the same time as the 1991–2020 average (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.

Trees 78

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 212

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 181

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 Glen Mills, PA.

Soil in Glen Mills, PA

The soil mapped at the center of ZIP 19342 is Gaila — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.5%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Gaila silt loam, 8 to 15 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 19342; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glen Mills, PA

Summer high89 °Faverage high, July
Winter low27 °Faverage low, January
Hot days27days a year at 90 °F or more
Freezing nights65nights a year at 32 °F or less
Growing degree days4,198base 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)
Precipitation48.7 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 43 °F, low 27 °F 43°27° JanFebruary: average high 46 °F, low 28 °F 46°28° FebMarch: average high 53 °F, low 35 °F 53°35° MarApril: average high 66 °F, low 45 °F 66°45° AprMay: average high 75 °F, low 55 °F 75°55° MayJune: average high 84 °F, low 65 °F 84°65° JunJuly: average high 89 °F, low 70 °F 89°70° JulAugust: average high 87 °F, low 69 °F 87°69° AugSeptember: average high 80 °F, low 61 °F 80°61° SepOctober: average high 68 °F, low 50 °F 68°50° OctNovember: average high 57 °F, low 40 °F 57°40° NovDecember: average high 48 °F, low 32 °F 48°32° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.50 in precipitation 3.5 JanFebruary: 2.78 in precipitation 2.8 FebMarch: 4.42 in precipitation 4.4 MarApril: 3.84 in precipitation 3.8 AprMay: 3.88 in precipitation 3.9 MayJune: 4.38 in precipitation 4.4 JunJuly: 4.97 in precipitation 5.0 JulAugust: 4.42 in precipitation 4.4 AugSeptember: 4.83 in precipitation 4.8 SepOctober: 4.38 in precipitation 4.4 OctNovember: 2.99 in precipitation 3.0 NovDecember: 4.33 in precipitation 4.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Marcus Hook, PA (7 mi away); precipitation: West Chester 2.4 Sse, PA (5 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.

193737a
Thornton, PA · 2 mi
193197a
Cheyney, PA · 2 mi
193407a
Concordville, PA · 2 mi
193317a
Concordville, PA · 2 mi
190177b
Chester Heights, PA · 2 mi
193957a
Westtown, PA · 3 mi
190397b
Gradyville, PA · 3 mi
190527b
Lenni, PA · 3 mi

Pennsylvania planting zones →

Questions about 19342

What planting zone is ZIP code 19342?

ZIP code 19342 (Glen Mills, 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 Glen Mills, PA?

The median last spring frost (32 °F) near 19342 is March 30; after April 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Marcus Hook station.

When is the first frost in Glen Mills, PA?

The median first fall frost near 19342 is November 16, giving a median frost-free growing season of 230 days.

When should I plant tomatoes in 19342?

Start tomato seeds indoors around Feb 2 – Feb 16 and set transplants outside around Apr 6 – Apr 20, one to three weeks after the median last frost.

How much rain and snow does 19342 get?

About 48.7 inches of precipitation a year (NOAA 1991–2020 normals, West Chester 2.4 Sse station).

How hot do summers get in Glen Mills, PA?

The average high peaks at 89 °F in July, with about 27 days a year at 90 °F or more.

What kind of soil does 19342 have?

The USDA soil survey maps Gaila at the center of ZIP 19342: silt loam, well drained, pH about 5.8 (moderately acidic).

Did spring come early in Glen Mills, PA in 2026?

Spring leaf-out near 19342 came on Mar 24 in 2026, about the same as the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glen Mills, PA?

Long-day onions: the longest day near 19342 is 15 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).