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

Planting zone for 21154 — Street, MD

ZIP code 21154 (Street, Harford County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 3 and the first fall frost November 6.

Where ZIP 21154 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 3

First frostNov 6

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 Street, 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 Street, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 3median — 50% chance of a later frost

Safe for tender plantsApril 18only 10% chance of frost after

First fall frostNovember 6median — 10% chance by Oct 26

Growing season217 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 24 and returns around November 17.

From the NOAA station Conowingo Dam, MD — 10 miles away, elevation 39 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 21154

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 20 – Mar 6

SpinachSow outdoors · Feb 20 – Mar 13

Broccoli, cabbageStart indoors · Jan 23 – Feb 6

Broccoli, cabbageTransplant · Mar 13 – Mar 27

Onion setsPlant outdoors · Mar 6 – Mar 20

PotatoesPlant outdoors · Mar 13 – Mar 27

LettuceSow outdoors · Mar 6 – Mar 20

Carrots, beetsSow outdoors · Mar 13 – Mar 27

TomatoesStart indoors · Feb 6 – Feb 20

TomatoesTransplant · Apr 10 – Apr 24

Peppers, eggplantStart indoors · Jan 23 – Feb 6

Peppers, eggplantTransplant · Apr 17 – May 1

BeansSow outdoors · Apr 10 – Apr 24

Sweet cornSow outdoors · Apr 10 – Apr 24

Cucumbers, squashSow outdoors · Apr 10 – Apr 24

Fall lettuce, spinachSow outdoors · Sep 11 – Sep 25

GarlicPlant cloves · Oct 23 – Nov 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 3) and first fall frost (Nov 6) 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 21154 came on Mar 19 — 3 days earlier than the 1991–2020 average (Mar 22).

average
Mar 222026
Mar 19

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 Maryland

612 plants native to the lower 48 states, recorded in Maryland, 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 Street, MD.

Soil in Street, MD

The soil mapped at the center of ZIP 21154 is Manor — channery loam, well drained.

TextureChannery loama good balance for most vegetables

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Manor channery loam, 15 to 25 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 21154; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Street, MD

Summer high88 °Faverage high, July

Winter low25 °Faverage low, January

Hot days37days a year at 90 °F or more

Freezing nights106nights a year at 32 °F or less

Growing degree days3,882base 50 °F — the season’s usable heat

Longest day14 h 59 mindaylight on June 21

Shortest day9 h 22 mindaylight on December 21

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

Precipitation47.9 inper year, rain and melted snow

Snowfall29 inper year; 25 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: Conowingo Dam, MD (10 mi away); precipitation: New Park, PA (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

2 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

211607a

Whiteford, MD · 4 mi

211327a

Pylesville, MD · 4 mi

210507b

Forest Hill, MD · 5 mi

210847a

Jarrettsville, MD · 6 mi

173147a

Delta, PA · 7 mi

210347a

Darlington, MD · 7 mi

173217a

Fawn Grove, PA · 8 mi

210147b

Bel Air, MD · 8 mi

Maryland planting zones →

Questions about 21154

What planting zone is ZIP code 21154?

ZIP code 21154 (Street, MD) 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 Street, MD?

The median last spring frost (32 °F) near 21154 is April 3; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Conowingo Dam station.

When is the first frost in Street, MD?

The median first fall frost near 21154 is November 6, giving a median frost-free growing season of 217 days.

When should I plant tomatoes in 21154?

Start tomato seeds indoors around Feb 6 – Feb 20 and set transplants outside around Apr 10 – Apr 24, one to three weeks after the median last frost.

How much rain and snow does 21154 get?

About 47.9 inches of precipitation a year and 29 inches of snowfall (NOAA 1991–2020 normals, New Park station).

How hot do summers get in Street, MD?

The average high peaks at 88 °F in July, with about 37 days a year at 90 °F or more.

What kind of soil does 21154 have?

The USDA soil survey maps Manor at the center of ZIP 21154: channery loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Street, MD in 2026?

Spring leaf-out near 21154 came on Mar 19 in 2026, 3 days earlier than the 1991–2020 average (Mar 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Street, MD?

Intermediate onions: the longest day near 21154 is 14 h 59 min, so day-neutral types bulb best; long-day varieties may not bulb fully.