Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 21773 — Myersville, MD

ZIP code 21773 (Myersville, Frederick County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 14 and the first fall frost October 30.

Where ZIP 21773 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 14

First frostOct 30

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 Myersville, 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 Myersville, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 14median — 50% chance of a later frost

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

First fall frostOctober 30median — 10% chance by Oct 14

Growing season197 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 8.

From the NOAA station Catoctin Mtn Park, MD — 8 miles away, elevation 1,611 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 21773

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 3 – Mar 17

SpinachSow outdoors · Mar 3 – Mar 24

Broccoli, cabbageStart indoors · Feb 3 – Feb 17

Broccoli, cabbageTransplant · Mar 24 – Apr 7

Onion setsPlant outdoors · Mar 17 – Mar 31

PotatoesPlant outdoors · Mar 24 – Apr 7

LettuceSow outdoors · Mar 17 – Mar 31

Carrots, beetsSow outdoors · Mar 24 – Apr 7

TomatoesStart indoors · Feb 17 – Mar 3

TomatoesTransplant · Apr 21 – May 5

Peppers, eggplantStart indoors · Feb 3 – Feb 17

Peppers, eggplantTransplant · Apr 28 – May 12

BeansSow outdoors · Apr 21 – May 5

Sweet cornSow outdoors · Apr 21 – May 5

Cucumbers, squashSow outdoors · Apr 21 – May 5

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 14) 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 21773 came on Mar 12 — 11 days earlier than the 1991–2020 average (Mar 23).

average
Mar 232026
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 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 Myersville, MD.

Soil in Myersville, MD

The soil mapped at the center of ZIP 21773 is Highfield — very stony silt loam, well drained.

TextureVery stony silt loama good balance for most vegetables

pH5.0strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Highfield gravelly silt loam, 8 to 15 percent slopes, very stony.

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 21773; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Myersville, MD

Summer high84 °Faverage high, July

Winter low23 °Faverage low, January

Hot days7days a year at 90 °F or more

Freezing nights106nights a year at 32 °F or less

Growing degree days3,429base 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

Precipitation46.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Catoctin Mtn Park, MD (8 mi away); precipitation: Middletown 1.8 Nne, MD (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

217137a

Boonsboro, MD · 6 mi

217697a

Middletown, MD · 7 mi

Smithsburg, MD · 8 mi

217887a

Thurmont, MD · 8 mi

217217a

Chewsville, MD · 8 mi

217467a

Hagerstown, MD · 9 mi

Maryland planting zones →

Questions about 21773

What planting zone is ZIP code 21773?

ZIP code 21773 (Myersville, 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 Myersville, MD?

The median last spring frost (32 °F) near 21773 is April 14; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Catoctin Mtn Park station.

When is the first frost in Myersville, MD?

The median first fall frost near 21773 is October 30, giving a median frost-free growing season of 197 days.

When should I plant tomatoes in 21773?

Start tomato seeds indoors around Feb 17 – Mar 3 and set transplants outside around Apr 21 – May 5, one to three weeks after the median last frost.

How much rain and snow does 21773 get?

About 46.1 inches of precipitation a year (NOAA 1991–2020 normals, Middletown 1.8 Nne station).

How hot do summers get in Myersville, MD?

The average high peaks at 84 °F in July, with about 7 days a year at 90 °F or more.

What kind of soil does 21773 have?

The USDA soil survey maps Highfield at the center of ZIP 21773: very stony silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Myersville, MD in 2026?

Spring leaf-out near 21773 came on Mar 12 in 2026, 11 days earlier than the 1991–2020 average (Mar 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Myersville, MD?

Intermediate onions: the longest day near 21773 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.