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

Planting zone for 20143 — Catharpin, VA

ZIP code 20143 (Catharpin, Prince William County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 15 and the first fall frost October 24.

Where ZIP 20143 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 15
First frostOct 24
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 Catharpin, VA…

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 Catharpin, VA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 15median — 50% chance of a later frost
Safe for tender plantsApril 30only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 10
Growing season194 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around November 4.

From the NOAA station Washington Dc Dulles Airport, VA — 7 miles away, elevation 289 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 20143

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 4 – Mar 18
SpinachSow outdoors · Mar 4 – Mar 25
Broccoli, cabbageStart indoors · Feb 4 – Feb 18
Broccoli, cabbageTransplant · Mar 25 – Apr 8
Onion setsPlant outdoors · Mar 18 – Apr 1
PotatoesPlant outdoors · Mar 25 – Apr 8
LettuceSow outdoors · Mar 18 – Apr 1
Carrots, beetsSow outdoors · Mar 25 – Apr 8
TomatoesStart indoors · Feb 18 – Mar 4
TomatoesTransplant · Apr 22 – May 6
Peppers, eggplantStart indoors · Feb 4 – Feb 18
Peppers, eggplantTransplant · Apr 29 – May 13
BeansSow outdoors · Apr 22 – May 6
Sweet cornSow outdoors · Apr 22 – May 6
Cucumbers, squashSow outdoors · Apr 22 – May 6
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Oct 24) 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 20143 came on Mar 11 — 5 days earlier than the 1991–2020 average (Mar 16).

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 Virginia

618 plants native to the lower 48 states, recorded in Virginia, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 87

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 129

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 197

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °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 °F

Grasses 179

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 Catharpin, VA.

Soil in Catharpin, VA

The soil mapped at the center of ZIP 20143 is Sycoline — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classprime farmlandUSDA classification

Map unit: Sycoline-Kelly complex, 2 to 7 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 20143; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Catharpin, VA

Summer high88 °Faverage high, July
Winter low25 °Faverage low, January
Hot days33days a year at 90 °F or more
Freezing nights102nights a year at 32 °F or less
Growing degree days3,886base 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
Precipitation43.2 inper year, rain and melted snow
Snowfall21 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 43 °F, low 25 °F 43°25° JanFebruary: average high 46 °F, low 27 °F 46°27° FebMarch: average high 55 °F, low 34 °F 55°34° MarApril: average high 67 °F, low 43 °F 67°43° AprMay: average high 75 °F, low 53 °F 75°53° MayJune: average high 83 °F, low 62 °F 83°62° JunJuly: average high 88 °F, low 67 °F 88°67° JulAugust: average high 86 °F, low 65 °F 86°65° AugSeptember: average high 79 °F, low 58 °F 79°58° SepOctober: average high 68 °F, low 45 °F 68°45° OctNovember: average high 57 °F, low 36 °F 57°36° NovDecember: average high 47 °F, low 29 °F 47°29° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.94 in precipitation, 6.9 in snowfall 2.9❄7 JanFebruary: 2.61 in precipitation, 7 in snowfall 2.6❄7 FebMarch: 3.50 in precipitation, 3.9 in snowfall 3.5❄4 MarApril: 3.47 in precipitation, 0.1 in snowfall 3.5 AprMay: 4.72 in precipitation 4.7 MayJune: 4.30 in precipitation 4.3 JunJuly: 4.15 in precipitation 4.2 JulAugust: 3.53 in precipitation 3.5 AugSeptember: 3.94 in precipitation 3.9 SepOctober: 3.65 in precipitation 3.6 OctNovember: 3.13 in precipitation, 0.3 in snowfall 3.1 NovDecember: 3.30 in precipitation, 2.8 in snowfall 3.3❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Washington Dc Dulles Airport, VA (7 mi away); precipitation: Washington Dc Dulles Airport, VA (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.

201527a
Chantilly, VA · 3 mi
201697a
Haymarket, VA · 4 mi
201207a
Centreville, VA · 4 mi
201557a
Gainesville, VA · 6 mi
201057a
Aldie, VA · 6 mi
201097a
Manassas, VA · 6 mi
201687a
Haymarket, VA · 6 mi
201517b
Chantilly, VA · 7 mi

Virginia planting zones →

Questions about 20143

What planting zone is ZIP code 20143?

ZIP code 20143 (Catharpin, VA) 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 Catharpin, VA?

The median last spring frost (32 °F) near 20143 is April 15; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Washington Dc Dulles Airport station.

When is the first frost in Catharpin, VA?

The median first fall frost near 20143 is October 24, giving a median frost-free growing season of 194 days.

When should I plant tomatoes in 20143?

Start tomato seeds indoors around Feb 18 – Mar 4 and set transplants outside around Apr 22 – May 6, one to three weeks after the median last frost.

How much rain and snow does 20143 get?

About 43.2 inches of precipitation a year and 21 inches of snowfall (NOAA 1991–2020 normals, Washington Dc Dulles Airport station).

How hot do summers get in Catharpin, VA?

The average high peaks at 88 °F in July, with about 33 days a year at 90 °F or more.

What kind of soil does 20143 have?

The USDA soil survey maps Sycoline at the center of ZIP 20143: silt loam, moderately well drained, pH about 5.0 (strongly acidic).

Did spring come early in Catharpin, VA in 2026?

Spring leaf-out near 20143 came on Mar 11 in 2026, 5 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Catharpin, VA?

Intermediate onions: the longest day near 20143 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.