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

Planting zone for 20608 — Aquasco, MD

ZIP code 20608 (Aquasco, 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 17 and the first fall frost October 27.

Where ZIP 20608 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 17

First frostOct 27

2012 zone7b

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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Aquasco, 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 Aquasco, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 17median — 50% chance of a later frost

Safe for tender plantsMay 2only 10% chance of frost after

First fall frostOctober 27median — 10% chance by Oct 12

Growing season195 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 6.

From the NOAA station Mechanicsville 5 Ne, MD — 6 miles away, elevation 102 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 20608

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 6 – Mar 20

SpinachSow outdoors · Mar 6 – Mar 27

Broccoli, cabbageStart indoors · Feb 6 – Feb 20

Broccoli, cabbageTransplant · Mar 27 – Apr 10

Onion setsPlant outdoors · Mar 20 – Apr 3

PotatoesPlant outdoors · Mar 27 – Apr 10

LettuceSow outdoors · Mar 20 – Apr 3

Carrots, beetsSow outdoors · Mar 27 – Apr 10

TomatoesStart indoors · Feb 20 – Mar 6

TomatoesTransplant · Apr 24 – May 8

Peppers, eggplantStart indoors · Feb 6 – Feb 20

Peppers, eggplantTransplant · May 1 – May 15

BeansSow outdoors · Apr 24 – May 8

Sweet cornSow outdoors · Apr 24 – May 8

Cucumbers, squashSow outdoors · Apr 24 – May 8

Fall lettuce, spinachSow outdoors · Sep 1 – Sep 15

GarlicPlant cloves · Oct 13 – Nov 17

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 17) and first fall frost (Oct 27) 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 20608 came on Mar 11 — about the same time as the 1991–2020 average (Mar 9).

average
Mar 92026
Mar 11

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.

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 Aquasco, MD.

Soil in Aquasco, MD

The soil mapped at the center of ZIP 20608 is Marr — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding

pH5.1strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter4.42%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Marr-Dodon complex, 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 20608; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Aquasco, MD

Summer high85 °Faverage high, July

Winter low25 °Faverage low, January

Hot days16days a year at 90 °F or more

Freezing nights98nights a year at 32 °F or less

Growing degree days3,649base 50 °F — the season’s usable heat

Longest day14 h 52 mindaylight on June 21

Shortest day9 h 28 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

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mechanicsville 5 Ne, MD (6 mi away); precipitation: Huntingtown 2.9 Nnw, MD (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

206377b

Hughesville, MD · 5 mi

206127b

Benedict, MD · 5 mi

206397b

Huntingtown, MD · 5 mi

206107b

Barstow, MD · 6 mi

206787b

Prince Frederick, MD · 7 mi

206137b

Brandywine, MD · 8 mi

206177b

Bryantown, MD · 9 mi

206897b

Sunderland, MD · 9 mi

Maryland planting zones →

Questions about 20608

What planting zone is ZIP code 20608?

ZIP code 20608 (Aquasco, 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 Aquasco, MD?

The median last spring frost (32 °F) near 20608 is April 17; after May 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mechanicsville 5 Ne station.

When is the first frost in Aquasco, MD?

The median first fall frost near 20608 is October 27, giving a median frost-free growing season of 195 days.

When should I plant tomatoes in 20608?

Start tomato seeds indoors around Feb 20 – Mar 6 and set transplants outside around Apr 24 – May 8, one to three weeks after the median last frost.

How much rain and snow does 20608 get?

About 47.8 inches of precipitation a year (NOAA 1991–2020 normals, Huntingtown 2.9 Nnw station).

How hot do summers get in Aquasco, MD?

The average high peaks at 85 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 20608 have?

The USDA soil survey maps Marr at the center of ZIP 20608: fine sandy loam, well drained, pH about 5.1 (strongly acidic).

Did spring come early in Aquasco, MD in 2026?

Spring leaf-out near 20608 came on Mar 11 in 2026, about the same as the 1991–2020 average (Mar 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Aquasco, MD?

Intermediate onions: the longest day near 20608 is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.