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

Planting zone for 21013 — Baldwin, MD

ZIP code 21013 (Baldwin, Baltimore County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 2 and the first fall frost November 7.

Where ZIP 21013 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 2
First frostNov 7
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 Baldwin, 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 Baldwin, MD

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 2median — 50% chance of a later frost
Safe for tender plantsApril 13only 10% chance of frost after
First fall frostNovember 7median — 10% chance by Oct 27
Growing season220 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 22 and returns around November 20.

From the NOAA station Cylburn, MD — 14 miles away, elevation 236 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 21013

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 19 – Mar 5
SpinachSow outdoors · Feb 19 – Mar 12
Broccoli, cabbageStart indoors · Jan 22 – Feb 5
Broccoli, cabbageTransplant · Mar 12 – Mar 26
Onion setsPlant outdoors · Mar 5 – Mar 19
PotatoesPlant outdoors · Mar 12 – Mar 26
LettuceSow outdoors · Mar 5 – Mar 19
Carrots, beetsSow outdoors · Mar 12 – Mar 26
TomatoesStart indoors · Feb 5 – Feb 19
TomatoesTransplant · Apr 9 – Apr 23
Peppers, eggplantStart indoors · Jan 22 – Feb 5
Peppers, eggplantTransplant · Apr 16 – Apr 30
BeansSow outdoors · Apr 9 – Apr 23
Sweet cornSow outdoors · Apr 9 – Apr 23
Cucumbers, squashSow outdoors · Apr 9 – Apr 23
Fall lettuce, spinachSow outdoors · Sep 12 – Sep 26
GarlicPlant cloves · Oct 24 – Nov 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 2) and first fall frost (Nov 7) 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 21013 came on Mar 15 — 4 days earlier than the 1991–2020 average (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 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.

Trees 83

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 127

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 beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °F

Wildflowers & perennials 206

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 176

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

Vines 12

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 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °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 Baldwin, MD.

Soil in Baldwin, MD

The soil mapped at the center of ZIP 21013 is Manor — loam, well drained.

TextureLoama 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 classFarmland of statewide importanceUSDA classification

Map unit: Manor 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 21013; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Baldwin, MD

Summer high87 °Faverage high, July
Winter low27 °Faverage low, January
Hot days18days a year at 90 °F or more
Freezing nights92nights a year at 32 °F or less
Growing degree days3,925base 50 °F — the season’s usable heat
Longest day14 h 58 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
Precipitation47.8 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 42 °F, low 27 °F 42°27° JanFebruary: average high 46 °F, low 28 °F 46°28° FebMarch: average high 54 °F, low 34 °F 54°34° MarApril: average high 66 °F, low 45 °F 66°45° AprMay: average high 73 °F, low 55 °F 73°55° MayJune: average high 82 °F, low 64 °F 82°64° JunJuly: average high 87 °F, low 69 °F 87°69° JulAugust: average high 84 °F, low 67 °F 84°67° AugSeptember: average high 77 °F, low 60 °F 77°60° SepOctober: average high 66 °F, low 49 °F 66°49° OctNovember: average high 56 °F, low 39 °F 56°39° NovDecember: average high 46 °F, low 32 °F 46°32° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.54 in precipitation 3.5 JanFebruary: 2.77 in precipitation 2.8 FebMarch: 4.13 in precipitation 4.1 MarApril: 3.60 in precipitation 3.6 AprMay: 4.44 in precipitation 4.4 MayJune: 4.20 in precipitation 4.2 JunJuly: 4.65 in precipitation 4.7 JulAugust: 4.16 in precipitation 4.2 AugSeptember: 4.77 in precipitation 4.8 SepOctober: 4.25 in precipitation 4.3 OctNovember: 3.28 in precipitation 3.3 NovDecember: 3.97 in precipitation 4.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cylburn, MD (14 mi away); precipitation: Jacksonville 1.5 Ne, MD (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

210827b
Hydes, MD · 2 mi
210477b
Fallston, MD · 3 mi
210927b
Long Green, MD · 3 mi
210517b
Fork, MD · 3 mi
210577b
Glen Arm, MD · 4 mi
211317b
Phoenix, MD · 5 mi
210187b
Benson, MD · 6 mi
210877b
Kingsville, MD · 6 mi

Maryland planting zones →

Questions about 21013

What planting zone is ZIP code 21013?

ZIP code 21013 (Baldwin, 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 Baldwin, MD?

The median last spring frost (32 °F) near 21013 is April 2; after April 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cylburn station.

When is the first frost in Baldwin, MD?

The median first fall frost near 21013 is November 7, giving a median frost-free growing season of 220 days.

When should I plant tomatoes in 21013?

Start tomato seeds indoors around Feb 5 – Feb 19 and set transplants outside around Apr 9 – Apr 23, one to three weeks after the median last frost.

How much rain and snow does 21013 get?

About 47.8 inches of precipitation a year (NOAA 1991–2020 normals, Jacksonville 1.5 Ne station).

How hot do summers get in Baldwin, MD?

The average high peaks at 87 °F in July, with about 18 days a year at 90 °F or more.

What kind of soil does 21013 have?

The USDA soil survey maps Manor at the center of ZIP 21013: loam, well drained, pH about 5.3 (strongly acidic).

Did spring come early in Baldwin, MD in 2026?

Spring leaf-out near 21013 came on Mar 15 in 2026, 4 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Baldwin, MD?

Intermediate onions: the longest day near 21013 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 21013 change?

Yes. The 2012 USDA map put 21013 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.