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

Planting zone for 19952 — Harrington, DE

ZIP code 19952 (Harrington, Kent County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 11 and the first fall frost October 30.

Where ZIP 19952 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.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostApr 11
First frostOct 30
2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Harrington, DE…

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 Harrington, DE

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 11median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostOctober 30median — 10% chance by Oct 14
Growing season200 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 11.

From the NOAA station Greenwood 2ne, DE — 7 miles away, elevation 46 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 19952

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 28 – Mar 14
SpinachSow outdoors · Feb 28 – Mar 21
Broccoli, cabbageStart indoors · Jan 31 – Feb 14
Broccoli, cabbageTransplant · Mar 21 – Apr 4
Onion setsPlant outdoors · Mar 14 – Mar 28
PotatoesPlant outdoors · Mar 21 – Apr 4
LettuceSow outdoors · Mar 14 – Mar 28
Carrots, beetsSow outdoors · Mar 21 – Apr 4
TomatoesStart indoors · Feb 14 – Feb 28
TomatoesTransplant · Apr 18 – May 2
Peppers, eggplantStart indoors · Jan 31 – Feb 14
Peppers, eggplantTransplant · Apr 25 – May 9
BeansSow outdoors · Apr 18 – May 2
Sweet cornSow outdoors · Apr 18 – May 2
Cucumbers, squashSow outdoors · Apr 18 – May 2
Fall lettuce, spinachSow outdoors · Sep 4 – Sep 18
GarlicPlant cloves · Oct 16 – Nov 20
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 30) 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 19952 came on Mar 11 — about the same time as the 1991–2020 average (Mar 13).

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 Delaware

503 plants native to the lower 48 states, recorded in Delaware, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

Trees 65

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 °FAtlantic white cedar50 ft · blooms spring · medium shade tolerance · to −36 °F

Shrubs 103

Allegheny 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 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 170

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 143

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °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 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °F

Vines 10

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 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °Fmuscadine30 ft · blooms late spring · medium shade tolerance · to −18 °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 Harrington, DE.

Soil in Harrington, DE

The soil mapped at the center of ZIP 19952 is Mullica — mucky sandy loam, very poorly drained.

TextureMucky sandy loamdrains and warms fast; dries out and needs more feeding
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter15.7%high
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Mullica mucky sandy loam, 0 to 2 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 19952; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Harrington, DE

Summer high87 °Faverage high, July
Winter low25 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights96nights a year at 32 °F or less
Growing degree days3,757base 50 °F — the season’s usable heat
Longest day14 h 54 mindaylight on June 21
Shortest day9 h 26 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation46.3 inper year, rain and melted snow
Snowfall13 inper year; 12 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 44 °F, low 25 °F 44°25° JanFebruary: average high 46 °F, low 26 °F 46°26° FebMarch: average high 54 °F, low 33 °F 54°33° MarApril: average high 65 °F, low 42 °F 65°42° AprMay: average high 73 °F, low 52 °F 73°52° MayJune: average high 82 °F, low 62 °F 82°62° JunJuly: average high 87 °F, low 67 °F 87°67° JulAugust: average high 85 °F, low 65 °F 85°65° AugSeptember: average high 79 °F, low 58 °F 79°58° SepOctober: average high 68 °F, low 46 °F 68°46° OctNovember: average high 57 °F, low 37 °F 57°37° NovDecember: average high 48 °F, low 29 °F 48°29° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.61 in precipitation, 3.3 in snowfall 3.6❄3 JanFebruary: 2.91 in precipitation, 5.9 in snowfall 2.9❄6 FebMarch: 4.01 in precipitation, 1.6 in snowfall 4.0❄2 MarApril: 3.44 in precipitation, 0.2 in snowfall 3.4 AprMay: 3.67 in precipitation 3.7 MayJune: 4.19 in precipitation 4.2 JunJuly: 4.01 in precipitation 4.0 JulAugust: 4.50 in precipitation 4.5 AugSeptember: 4.77 in precipitation 4.8 SepOctober: 4.23 in precipitation 4.2 OctNovember: 3.19 in precipitation 3.2 NovDecember: 3.78 in precipitation, 1.8 in snowfall 3.8❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Greenwood 2ne, DE (7 mi away); precipitation: Greenwood 2ne, DE (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

199547b
Houston, DE · 5 mi
199437b
Felton, DE · 6 mi
199507b
Greenwood, DE · 7 mi
199797b
Viola, DE · 9 mi
216397b
Greensboro, MD · 10 mi
199347b
Camden Wyoming, DE · 12 mi
199607b
Lincoln, DE · 12 mi
199467b
Frederica, DE · 12 mi

Delaware planting zones →

Questions about 19952

What planting zone is ZIP code 19952?

ZIP code 19952 (Harrington, DE) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Harrington, DE?

The median last spring frost (32 °F) near 19952 is April 11; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Greenwood 2ne station.

When is the first frost in Harrington, DE?

The median first fall frost near 19952 is October 30, giving a median frost-free growing season of 200 days.

When should I plant tomatoes in 19952?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 19952 get?

About 46.3 inches of precipitation a year and 13 inches of snowfall (NOAA 1991–2020 normals, Greenwood 2ne station).

How hot do summers get in Harrington, DE?

The average high peaks at 87 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 19952 have?

The USDA soil survey maps Mullica at the center of ZIP 19952: mucky sandy loam, very poorly drained, pH about 6.0 (slightly acidic).

Did spring come early in Harrington, DE in 2026?

Spring leaf-out near 19952 came on Mar 11 in 2026, about the same as the 1991–2020 average (Mar 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Harrington, DE?

Intermediate onions: the longest day near 19952 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 19952 change?

Yes. The 2012 USDA map put 19952 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.