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

Planting zone for 20527 — Washington, DC

ZIP code 20527 (Washington, District of Columbia County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 29 and the first fall frost November 8.

Where ZIP 20527 is

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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 29
First frostNov 8
2012 zone7a

Was 7a on the 2012 map — a full zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Washington, DC…

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 Washington, DC

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 29median — 50% chance of a later frost
Safe for tender plantsApril 11only 10% chance of frost after
First fall frostNovember 8median — 10% chance by Oct 26
Growing season224 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 17 and returns around November 20.

From the NOAA station Natl Arboretum Dc, MD — 4 miles away, elevation 49 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 20527

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 15 – Mar 1
SpinachSow outdoors · Feb 15 – Mar 8
Broccoli, cabbageStart indoors · Jan 18 – Feb 1
Broccoli, cabbageTransplant · Mar 8 – Mar 22
Onion setsPlant outdoors · Mar 1 – Mar 15
PotatoesPlant outdoors · Mar 8 – Mar 22
LettuceSow outdoors · Mar 1 – Mar 15
Carrots, beetsSow outdoors · Mar 8 – Mar 22
TomatoesStart indoors · Feb 1 – Feb 15
TomatoesTransplant · Apr 5 – Apr 19
Peppers, eggplantStart indoors · Jan 18 – Feb 1
Peppers, eggplantTransplant · Apr 12 – Apr 26
BeansSow outdoors · Apr 5 – Apr 19
Sweet cornSow outdoors · Apr 5 – Apr 19
Cucumbers, squashSow outdoors · Apr 5 – Apr 19
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 (Mar 29) 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 20527 came on Mar 10 — about the same time as the 1991–2020 average (Mar 9).

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 8a in District of Columbia

427 plants native to the lower 48 states, recorded in District of Columbia, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. Each links to its USDA PLANTS profile.

Trees 59

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 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °F

Shrubs 80

Allegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °F

Wildflowers & perennials 144

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican vetch1.3 ft · blooms late spring · high shade tolerance · to −38 °FAmerican water horehound1.8 ft · blooms early summer · low shade tolerance · to −38 °FAmerican water plantain0.5 ft · blooms late spring · high shade tolerance · to −33 °F

Grasses 123

arctic 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 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblunt broom sedge3 ft · blooms late spring · low shade tolerance · to −28 °F

Vines 9

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °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 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °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 Washington, DC.

Soil in Washington, DC

The center of ZIP 20527 is mapped as Urban land: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 20527; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Washington, DC

Summer high90 °Faverage high, July
Winter low28 °Faverage low, January
Hot days48days a year at 90 °F or more
Freezing nights84nights a year at 32 °F or less
Growing degree days4,518base 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
Precipitation45.6 inper year, rain and melted snow
Snowfall10 inper year; 12 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 45 °F, low 28 °F 45°28° JanFebruary: average high 48 °F, low 30 °F 48°30° FebMarch: average high 56 °F, low 37 °F 56°37° MarApril: average high 68 °F, low 46 °F 68°46° AprMay: average high 77 °F, low 57 °F 77°57° MayJune: average high 85 °F, low 66 °F 85°66° JunJuly: average high 90 °F, low 71 °F 90°71° JulAugust: average high 88 °F, low 69 °F 88°69° AugSeptember: average high 82 °F, low 62 °F 82°62° SepOctober: average high 70 °F, low 49 °F 70°49° OctNovember: average high 58 °F, low 39 °F 58°39° NovDecember: average high 49 °F, low 32 °F 49°32° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.03 in precipitation, 4.7 in snowfall 3.0❄5 JanFebruary: 2.77 in precipitation, 2.3 in snowfall 2.8❄2 FebMarch: 3.96 in precipitation, 1.4 in snowfall 4.0❄1 MarApril: 3.44 in precipitation 3.4 AprMay: 4.32 in precipitation 4.3 MayJune: 4.56 in precipitation 4.6 JunJuly: 4.62 in precipitation 4.6 JulAugust: 3.67 in precipitation 3.7 AugSeptember: 4.12 in precipitation 4.1 SepOctober: 4.23 in precipitation 4.2 OctNovember: 3.20 in precipitation 3.2 NovDecember: 3.67 in precipitation, 1.3 in snowfall 3.7❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Natl Arboretum Dc, MD (4 mi away); precipitation: Natl Arboretum Dc, MD (4 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.

205778a
Washington, DC · <1 mi
205718a
Washington, DC · <1 mi
205248a
Washington, DC · <1 mi
200628a
Washington, DC · <1 mi
205338a
Washington, DC · <1 mi
202327b
Washington, DC · <1 mi
205068a
Washington, DC · <1 mi
200058a
Washington, DC · <1 mi

All 266 ZIP codes in Washington → · District of Columbia planting zones →

Questions about 20527

What planting zone is ZIP code 20527?

ZIP code 20527 (Washington, DC) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Washington, DC?

The median last spring frost (32 °F) near 20527 is March 29; after April 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Natl Arboretum Dc station.

When is the first frost in Washington, DC?

The median first fall frost near 20527 is November 8, giving a median frost-free growing season of 224 days.

When should I plant tomatoes in 20527?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 20527 get?

About 45.6 inches of precipitation a year and 10 inches of snowfall (NOAA 1991–2020 normals, Natl Arboretum Dc station).

How hot do summers get in Washington, DC?

The average high peaks at 90 °F in July, with about 48 days a year at 90 °F or more.

Did spring come early in Washington, DC in 2026?

Spring leaf-out near 20527 came on Mar 10 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 Washington, DC?

Intermediate onions: the longest day near 20527 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 20527 change?

Yes. The 2012 USDA map put 20527 in zone 7a; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.