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

Planting zone for Oxon Hill, MD

Oxon Hill, MD is in USDA zones 7b to 8a across its 2 ZIP codes. The median last spring frost is April 3 and the first fall frost November 8.

Oxon Hill on the zone map

Outlined: its 1 ZIP code areas · 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.

Zones7b–8a5 to 15 °F

ZIP codes2

Last frostApr 3

First frostNov 8

Growing season217 days

7b 1 ZIP 8a 1 ZIP

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Oxon Hill, 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 Oxon Hill, MD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 3median — 50% chance of a later frost

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

First fall frostNovember 8median — 10% chance by Oct 24

Growing season217 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 21 and returns around November 19.

From the NOAA station Oxon Hill, MD, elevation 190 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 Oxon Hill

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 20 – Mar 6

SpinachSow outdoors · Feb 20 – Mar 13

Broccoli, cabbageStart indoors · Jan 23 – Feb 6

Broccoli, cabbageTransplant · Mar 13 – Mar 27

Onion setsPlant outdoors · Mar 6 – Mar 20

PotatoesPlant outdoors · Mar 13 – Mar 27

LettuceSow outdoors · Mar 6 – Mar 20

Carrots, beetsSow outdoors · Mar 13 – Mar 27

TomatoesStart indoors · Feb 6 – Feb 20

TomatoesTransplant · Apr 10 – Apr 24

Peppers, eggplantStart indoors · Jan 23 – Feb 6

Peppers, eggplantTransplant · Apr 17 – May 1

BeansSow outdoors · Apr 10 – Apr 24

Sweet cornSow outdoors · Apr 10 – Apr 24

Cucumbers, squashSow outdoors · Apr 10 – Apr 24

Fall lettuce, spinachSow outdoors · Sep 13 – Sep 27

GarlicPlant cloves · Oct 25 – Nov 29

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 3) and first fall frost (Nov 8) 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 20745 came on Mar 6 — about the same time as the 1991–2020 average (Mar 8).

average
Mar 82026
Mar 6

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 Oxon Hill, MD.

Soil in Oxon Hill, MD

The soil mapped at the center of ZIP 20745 is Udorthents, well drained.

DrainageWell drainednatural drainage class

Farmland classNot prime farmlandUSDA classification

Map unit: Udorthents, highway, 0 to 65 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 20745; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Oxon Hill, MD

Summer high88 °Faverage high, July

Winter low27 °Faverage low, January

Hot days38days a year at 90 °F or more

Freezing nights80nights a year at 32 °F or less

Growing degree days4,190base 50 °F — the season’s usable heat

Longest day14 h 53 mindaylight on June 21

Shortest day9 h 27 mindaylight on December 21

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

Precipitation46.8 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: Oxon Hill, MD (within 1 mile); precipitation: Oxon Hill, MD (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Oxon Hill

Maryland planting zones →

Questions about Oxon Hill

What planting zone is Oxon Hill, MD?

Oxon Hill, MD is in USDA hardiness zones 7b to 8a on the 2023 map (7b: 5 to 10 °F; 8a: 10 to 15 °F).

When is the last frost in Oxon Hill, MD?

The median last spring frost is April 3 and the median first fall frost is November 8 (NOAA 1991–2020 normals, Oxon Hill station).

When can I plant a garden in Oxon Hill, MD?

Cool-season crops like peas and spinach go in around Feb 20 – Mar 13; tomatoes, peppers, beans and squash after about Apr 10, once frost risk has passed.

What kind of onions grow in Oxon Hill, MD?

Intermediate onions: the longest day is 14 h 53 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Oxon Hill, MD get?

About 46.8 inches of precipitation a year (NOAA 1991–2020 normals).