Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for 21804 — Salisbury, MD

ZIP code 21804 (Salisbury, Wicomico County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 10 and the first fall frost October 30.

Where ZIP 21804 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 10

First frostOct 30

2012 zone7b

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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Salisbury, MD…

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 Salisbury, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 10median — 50% chance of a later frost

Safe for tender plantsApril 30only 10% chance of frost after

First fall frostOctober 30median — 10% chance by Oct 15

Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 9.

From the NOAA station Salisbury Wicomico Regional Airport, MD — 2 miles away, elevation 49 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 21804

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 27 – Mar 13

SpinachSow outdoors · Feb 27 – Mar 20

Broccoli, cabbageStart indoors · Jan 30 – Feb 13

Broccoli, cabbageTransplant · Mar 20 – Apr 3

Onion setsPlant outdoors · Mar 13 – Mar 27

PotatoesPlant outdoors · Mar 20 – Apr 3

LettuceSow outdoors · Mar 13 – Mar 27

Carrots, beetsSow outdoors · Mar 20 – Apr 3

TomatoesStart indoors · Feb 13 – Feb 27

TomatoesTransplant · Apr 17 – May 1

Peppers, eggplantStart indoors · Jan 30 – Feb 13

Peppers, eggplantTransplant · Apr 24 – May 8

BeansSow outdoors · Apr 17 – May 1

Sweet cornSow outdoors · Apr 17 – May 1

Cucumbers, squashSow outdoors · Apr 17 – May 1

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 10) 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 21804 came on Mar 10 — 3 days later than the 1991–2020 average (Mar 7).

average
Mar 72026
Mar 10

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 Maryland

618 plants native to the lower 48 states, recorded in Maryland, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Salisbury, MD.

Soil in Salisbury, MD

The soil mapped at the center of ZIP 21804 is Lenni — moderately decomposed plant material, poorly drained.

TextureModerately decomposed plant materialtop layer

pH4.5strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter94%high

Hydrologic groupDwater soaks in very slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Lenni 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 21804; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Salisbury, MD

Summer high88 °Faverage high, July

Winter low28 °Faverage low, January

Hot days30days a year at 90 °F or more

Freezing nights94nights a year at 32 °F or less

Growing degree days4,056base 50 °F — the season’s usable heat

Longest day14 h 50 mindaylight on June 21

Shortest day9 h 30 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation47.5 inper year, rain and melted snow

Snowfall8 inper year; 4 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Salisbury Wicomico Regional Airport, MD (2 mi away); precipitation: Salisbury Wicomico Regional Airport, MD (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

218267b

Fruitland, MD · 5 mi

218497b

Parsonsburg, MD · 5 mi

Pittsville, MD · 8 mi

218017b

Salisbury, MD · 8 mi

218527b

Powellville, MD · 9 mi

All 4 ZIP codes in Salisbury → · Maryland planting zones →

Questions about 21804

What planting zone is ZIP code 21804?

ZIP code 21804 (Salisbury, MD) 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 Salisbury, MD?

The median last spring frost (32 °F) near 21804 is April 10; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Salisbury Wicomico Regional Airport station.

When is the first frost in Salisbury, MD?

The median first fall frost near 21804 is October 30, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 21804?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 21804 get?

About 47.5 inches of precipitation a year and 8 inches of snowfall (NOAA 1991–2020 normals, Salisbury Wicomico Regional Airport station).

How hot do summers get in Salisbury, MD?

The average high peaks at 88 °F in July, with about 30 days a year at 90 °F or more.

What kind of soil does 21804 have?

The USDA soil survey maps Lenni at the center of ZIP 21804: moderately decomposed plant material, poorly drained, pH about 4.5 (strongly acidic).

Did spring come early in Salisbury, MD in 2026?

Spring leaf-out near 21804 came on Mar 10 in 2026, 3 days later than the 1991–2020 average (Mar 7), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Salisbury, MD?

Intermediate onions: the longest day near 21804 is 14 h 50 min, so day-neutral types bulb best; long-day varieties may not bulb fully.