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

Planting zone for 19964 — Marydel, DE

ZIP code 19964 (Marydel, Kent County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 4 and the first fall frost November 4.

Where ZIP 19964 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 4
First frostNov 4
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 Marydel, 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 Marydel, DE

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 4median — 50% chance of a later frost
Safe for tender plantsApril 17only 10% chance of frost after
First fall frostNovember 4median — 10% chance by Oct 23
Growing season214 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 25 and returns around November 16.

From the NOAA station Dover, DE — 12 miles away, elevation 30 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 19964

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 21 – Mar 7
SpinachSow outdoors · Feb 21 – Mar 14
Broccoli, cabbageStart indoors · Jan 24 – Feb 7
Broccoli, cabbageTransplant · Mar 14 – Mar 28
Onion setsPlant outdoors · Mar 7 – Mar 21
PotatoesPlant outdoors · Mar 14 – Mar 28
LettuceSow outdoors · Mar 7 – Mar 21
Carrots, beetsSow outdoors · Mar 14 – Mar 28
TomatoesStart indoors · Feb 7 – Feb 21
TomatoesTransplant · Apr 11 – Apr 25
Peppers, eggplantStart indoors · Jan 24 – Feb 7
Peppers, eggplantTransplant · Apr 18 – May 2
BeansSow outdoors · Apr 11 – Apr 25
Sweet cornSow outdoors · Apr 11 – Apr 25
Cucumbers, squashSow outdoors · Apr 11 – Apr 25
Fall lettuce, spinachSow outdoors · Sep 9 – Sep 23
GarlicPlant cloves · Oct 21 – Nov 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 4) and first fall frost (Nov 4) 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 19964 came on Mar 12 — 3 days earlier than the 1991–2020 average (Mar 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).

Soil in Marydel, DE

The soil mapped at the center of ZIP 19964 is Glassboro — sandy loam, somewhat poorly drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH6.4slightly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter1.5%low — add compost
Hydrologic groupA/Ddrains fast once dried out; wet otherwise
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Glassboro 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 19964; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Marydel, DE

Summer high87 °Faverage high, July
Winter low28 °Faverage low, January
Hot days25days a year at 90 °F or more
Freezing nights79nights a year at 32 °F or less
Growing degree days4,118base 50 °F — the season’s usable heat
Longest day14 h 55 mindaylight on June 21
Shortest day9 h 25 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation50 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 44 °F, low 28 °F 44°28° JanFebruary: average high 47 °F, low 29 °F 47°29° FebMarch: average high 55 °F, low 35 °F 55°35° MarApril: average high 66 °F, low 45 °F 66°45° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 64 °F 83°64° JunJuly: average high 87 °F, low 69 °F 87°69° JulAugust: average high 85 °F, low 67 °F 85°67° AugSeptember: average high 79 °F, low 61 °F 79°61° SepOctober: average high 69 °F, low 50 °F 69°50° OctNovember: average high 58 °F, low 39 °F 58°39° NovDecember: average high 49 °F, low 32 °F 49°32° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.71 in precipitation 3.7 JanFebruary: 3.19 in precipitation 3.2 FebMarch: 4.36 in precipitation 4.4 MarApril: 3.58 in precipitation 3.6 AprMay: 4.08 in precipitation 4.1 MayJune: 4.33 in precipitation 4.3 JunJuly: 4.47 in precipitation 4.5 JulAugust: 5.15 in precipitation 5.2 AugSeptember: 5.18 in precipitation 5.2 SepOctober: 4.35 in precipitation 4.3 OctNovember: 3.27 in precipitation 3.3 NovDecember: 4.30 in precipitation 4.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Dover, DE (12 mi away); precipitation: Greensboro 1.4 Ene, MD (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

216707b
Templeville, MD · 4 mi
199537b
Hartly, DE · 4 mi
216497b
Marydel, MD · 5 mi
199347b
Camden Wyoming, DE · 5 mi
216407b
Henderson, MD · 5 mi
216367b
Goldsboro, MD · 7 mi
216077b
Barclay, MD · 7 mi
216447b
Ingleside, MD · 8 mi

Delaware planting zones →

Questions about 19964

What planting zone is ZIP code 19964?

ZIP code 19964 (Marydel, 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 Marydel, DE?

The median last spring frost (32 °F) near 19964 is April 4; after April 17 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Dover station.

When is the first frost in Marydel, DE?

The median first fall frost near 19964 is November 4, giving a median frost-free growing season of 214 days.

When should I plant tomatoes in 19964?

Start tomato seeds indoors around Feb 7 – Feb 21 and set transplants outside around Apr 11 – Apr 25, one to three weeks after the median last frost.

How much rain and snow does 19964 get?

About 50 inches of precipitation a year (NOAA 1991–2020 normals, Greensboro 1.4 Ene station).

How hot do summers get in Marydel, DE?

The average high peaks at 87 °F in July, with about 25 days a year at 90 °F or more.

What kind of soil does 19964 have?

The USDA soil survey maps Glassboro at the center of ZIP 19964: sandy loam, somewhat poorly drained, pH about 6.4 (slightly acidic).

Did spring come early in Marydel, DE in 2026?

Spring leaf-out near 19964 came on Mar 12 in 2026, 3 days earlier than the 1991–2020 average (Mar 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Marydel, DE?

Intermediate onions: the longest day near 19964 is 14 h 55 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 19964 change?

Yes. The 2012 USDA map put 19964 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.