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

Planting zone for 21545 — Mount Savage, MD

ZIP code 21545 (Mount Savage, Allegany County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 29 and the first fall frost October 18.

Where ZIP 21545 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.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostApr 29

First frostOct 18

2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mount Savage, 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 Mount Savage, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 29median — 50% chance of a later frost

Safe for tender plantsMay 15only 10% chance of frost after

First fall frostOctober 18median — 10% chance by Oct 5

Growing season171 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 17 and returns around October 29.

From the NOAA station Frostburg 2, MD — 6 miles away, elevation 2,169 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 21545

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 18 – Apr 1

SpinachSow outdoors · Mar 18 – Apr 8

Broccoli, cabbageStart indoors · Feb 18 – Mar 4

Broccoli, cabbageTransplant · Apr 8 – Apr 22

Onion setsPlant outdoors · Apr 1 – Apr 15

PotatoesPlant outdoors · Apr 8 – Apr 22

LettuceSow outdoors · Apr 1 – Apr 15

Carrots, beetsSow outdoors · Apr 8 – Apr 22

TomatoesStart indoors · Mar 4 – Mar 18

TomatoesTransplant · May 6 – May 20

Peppers, eggplantStart indoors · Feb 18 – Mar 4

Peppers, eggplantTransplant · May 13 – May 27

BeansSow outdoors · May 6 – May 20

Sweet cornSow outdoors · May 6 – May 20

Cucumbers, squashSow outdoors · May 6 – May 20

Fall lettuce, spinachSow outdoors · Aug 23 – Sep 6

GarlicPlant cloves · Oct 4 – Nov 8

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Oct 18) 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 21545 came on Mar 12 — 18 days earlier than the 1991–2020 average (Mar 30).

average
Mar 302026
Mar 12

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 6b in Maryland

590 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 6b. 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 Mount Savage, MD.

Soil in Mount Savage, MD

The soil mapped at the center of ZIP 21545 is Cedarcreek — channery loam, well drained.

TextureChannery loama good balance for most vegetables

pH4.6strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Cedarcreek channery loam, 0 to 8 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 21545; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mount Savage, MD

Summer high79 °Faverage high, July

Winter low19 °Faverage low, January

Hot days1days a year at 90 °F or more

Freezing nights132nights a year at 32 °F or less

Growing degree days2,508base 50 °F — the season’s usable heat

Longest day14 h 59 mindaylight on June 21

Shortest day9 h 21 mindaylight on December 21

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

Precipitation45.2 inper year, rain and melted snow

Snowfall72 inper year; 70 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: Frostburg 2, MD (6 mi away); precipitation: Frostburg 2, MD (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

155646b

Wellersburg, PA · 2 mi

215247a

Corriganville, MD · 3 mi

215297a

Ellerslie, MD · 4 mi

215286b

Eckhart Mines, MD · 4 mi

215017a

Cumberland, MD · 6 mi

215037a

Cumberland, MD · 6 mi

215027a

Cumberland, MD · 7 mi

215436b

Midlothian, MD · 7 mi

Maryland planting zones →

Questions about 21545

What planting zone is ZIP code 21545?

ZIP code 21545 (Mount Savage, MD) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Mount Savage, MD?

The median last spring frost (32 °F) near 21545 is April 29; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Frostburg 2 station.

When is the first frost in Mount Savage, MD?

The median first fall frost near 21545 is October 18, giving a median frost-free growing season of 171 days.

When should I plant tomatoes in 21545?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 21545 get?

About 45.2 inches of precipitation a year and 72 inches of snowfall (NOAA 1991–2020 normals, Frostburg 2 station).

How hot do summers get in Mount Savage, MD?

The average high peaks at 79 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 21545 have?

The USDA soil survey maps Cedarcreek at the center of ZIP 21545: channery loam, well drained, pH about 4.6 (strongly acidic).

Did spring come early in Mount Savage, MD in 2026?

Spring leaf-out near 21545 came on Mar 12 in 2026, 18 days earlier than the 1991–2020 average (Mar 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mount Savage, MD?

Intermediate onions: the longest day near 21545 is 14 h 59 min, so day-neutral types bulb best; long-day varieties may not bulb fully.