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

Planting zone for 20769 — Glenn Dale, MD

ZIP code 20769 (Glenn Dale, Prince George's County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 22 and the first fall frost October 22.

Where ZIP 20769 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 22
First frostOct 22
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 Glenn Dale, 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 Glenn Dale, MD

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 22median — 50% chance of a later frost
Safe for tender plantsMay 9only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 7
Growing season183 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 7 and returns around November 1.

From the NOAA station Glenn Dale Bell Stn, MD — 2 miles away, elevation 151 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 20769

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 11 – Mar 25
SpinachSow outdoors · Mar 11 – Apr 1
Broccoli, cabbageStart indoors · Feb 11 – Feb 25
Broccoli, cabbageTransplant · Apr 1 – Apr 15
Onion setsPlant outdoors · Mar 25 – Apr 8
PotatoesPlant outdoors · Apr 1 – Apr 15
LettuceSow outdoors · Mar 25 – Apr 8
Carrots, beetsSow outdoors · Apr 1 – Apr 15
TomatoesStart indoors · Feb 25 – Mar 11
TomatoesTransplant · Apr 29 – May 13
Peppers, eggplantStart indoors · Feb 11 – Feb 25
Peppers, eggplantTransplant · May 6 – May 20
BeansSow outdoors · Apr 29 – May 13
Sweet cornSow outdoors · Apr 29 – May 13
Cucumbers, squashSow outdoors · Apr 29 – May 13
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 22) and first fall frost (Oct 22) 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 20769 came on Mar 12 — 5 days earlier than the 1991–2020 average (Mar 17).

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 Glenn Dale, MD.

Soil in Glenn Dale, MD

The soil mapped at the center of ZIP 20769 is Christiana — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH4.3strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Christiana-Downer complex, 5 to 10 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 20769; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glenn Dale, MD

Summer high89 °Faverage high, July
Winter low22 °Faverage low, January
Hot days39days a year at 90 °F or more
Freezing nights112nights a year at 32 °F or less
Growing degree days3,762base 50 °F — the season’s usable heat
Longest day14 h 54 mindaylight on June 21
Shortest day9 h 26 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation44 inper year, rain and melted snow
Snowfall16 inper year; 14 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 44 °F, low 22 °F 44°22° JanFebruary: average high 47 °F, low 23 °F 47°23° FebMarch: average high 55 °F, low 31 °F 55°31° MarApril: average high 66 °F, low 41 °F 66°41° AprMay: average high 75 °F, low 51 °F 75°51° MayJune: average high 83 °F, low 61 °F 83°61° JunJuly: average high 89 °F, low 66 °F 89°66° JulAugust: average high 87 °F, low 65 °F 87°65° AugSeptember: average high 79 °F, low 57 °F 79°57° SepOctober: average high 68 °F, low 44 °F 68°44° OctNovember: average high 57 °F, low 33 °F 57°33° NovDecember: average high 48 °F, low 27 °F 48°27° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.87 in precipitation, 5.7 in snowfall 2.9❄6 JanFebruary: 2.40 in precipitation, 5 in snowfall 2.4❄5 FebMarch: 3.72 in precipitation, 2.5 in snowfall 3.7❄3 MarApril: 3.28 in precipitation, 0.1 in snowfall 3.3 AprMay: 4.27 in precipitation 4.3 MayJune: 4.23 in precipitation 4.2 JunJuly: 4.51 in precipitation 4.5 JulAugust: 3.88 in precipitation 3.9 AugSeptember: 4.42 in precipitation 4.4 SepOctober: 4.04 in precipitation 4.0 OctNovember: 2.92 in precipitation, 0.2 in snowfall 2.9 NovDecember: 3.48 in precipitation, 2.3 in snowfall 3.5❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Glenn Dale Bell Stn, MD (2 mi away); precipitation: Beltsville, MD (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

207207b
Bowie, MD · 1 mi
207717b
Greenbelt, MD · 3 mi
207067b
Lanham, MD · 3 mi
207087b
Laurel, MD · 4 mi
207687b
Greenbelt, MD · 4 mi
207157a
Bowie, MD · 4 mi
207707b
Greenbelt, MD · 4 mi
207847b
Hyattsville, MD · 5 mi

Maryland planting zones →

Questions about 20769

What planting zone is ZIP code 20769?

ZIP code 20769 (Glenn Dale, 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 Glenn Dale, MD?

The median last spring frost (32 °F) near 20769 is April 22; after May 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Glenn Dale Bell Stn station.

When is the first frost in Glenn Dale, MD?

The median first fall frost near 20769 is October 22, giving a median frost-free growing season of 183 days.

When should I plant tomatoes in 20769?

Start tomato seeds indoors around Feb 25 – Mar 11 and set transplants outside around Apr 29 – May 13, one to three weeks after the median last frost.

How much rain and snow does 20769 get?

About 44 inches of precipitation a year and 16 inches of snowfall (NOAA 1991–2020 normals, Beltsville station).

How hot do summers get in Glenn Dale, MD?

The average high peaks at 89 °F in July, with about 39 days a year at 90 °F or more.

What kind of soil does 20769 have?

The USDA soil survey maps Christiana at the center of ZIP 20769: silt loam, moderately well drained, pH about 4.3 (strongly acidic).

Did spring come early in Glenn Dale, MD in 2026?

Spring leaf-out near 20769 came on Mar 12 in 2026, 5 days earlier than the 1991–2020 average (Mar 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glenn Dale, MD?

Intermediate onions: the longest day near 20769 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 20769 change?

Yes. The 2012 USDA map put 20769 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.