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

Planting zone for 20138 — Calverton, VA

ZIP code 20138 (Calverton, Fauquier County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 9 and the first fall frost November 1.

Where ZIP 20138 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 9
First frostNov 1
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 Calverton, 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 Calverton, VA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 9median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 18
Growing season205 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 29 and returns around November 14.

From the NOAA station Warrenton 3 Se, VA — 6 miles away, elevation 499 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 20138

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 26 – Mar 12
SpinachSow outdoors · Feb 26 – Mar 19
Broccoli, cabbageStart indoors · Jan 29 – Feb 12
Broccoli, cabbageTransplant · Mar 19 – Apr 2
Onion setsPlant outdoors · Mar 12 – Mar 26
PotatoesPlant outdoors · Mar 19 – Apr 2
LettuceSow outdoors · Mar 12 – Mar 26
Carrots, beetsSow outdoors · Mar 19 – Apr 2
TomatoesStart indoors · Feb 12 – Feb 26
TomatoesTransplant · Apr 16 – Apr 30
Peppers, eggplantStart indoors · Jan 29 – Feb 12
Peppers, eggplantTransplant · Apr 23 – May 7
BeansSow outdoors · Apr 16 – Apr 30
Sweet cornSow outdoors · Apr 16 – Apr 30
Cucumbers, squashSow outdoors · Apr 16 – Apr 30
Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20
GarlicPlant cloves · Oct 18 – Nov 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 9) and first fall frost (Nov 1) 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 20138 came on Mar 9 — about the same time as the 1991–2020 average (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 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 Calverton, VA.

Soil in Calverton, VA

The soil mapped at the center of ZIP 20138 is Albano — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter1.5%low — add compost
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Albano silt loam, 0 to 2 percent slopes, frequently flooded.

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 20138; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Calverton, VA

Summer high85 °Faverage high, July
Winter low25 °Faverage low, January
Hot days21days a year at 90 °F or more
Freezing nights98nights a year at 32 °F or less
Growing degree days3,630base 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
Precipitation46 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 25 °F 42°25° JanFebruary: average high 46 °F, low 27 °F 46°27° FebMarch: average high 54 °F, low 34 °F 54°34° MarApril: average high 66 °F, low 44 °F 66°44° AprMay: average high 73 °F, low 52 °F 73°52° MayJune: average high 81 °F, low 61 °F 81°61° JunJuly: average high 85 °F, low 66 °F 85°66° JulAugust: average high 84 °F, low 64 °F 84°64° AugSeptember: average high 78 °F, low 58 °F 78°58° SepOctober: average high 67 °F, low 46 °F 67°46° OctNovember: average high 56 °F, low 37 °F 56°37° NovDecember: average high 46 °F, low 29 °F 46°29° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.12 in precipitation 3.1 JanFebruary: 2.75 in precipitation 2.8 FebMarch: 3.76 in precipitation 3.8 MarApril: 3.48 in precipitation 3.5 AprMay: 4.45 in precipitation 4.5 MayJune: 4.51 in precipitation 4.5 JunJuly: 4.89 in precipitation 4.9 JulAugust: 4.03 in precipitation 4.0 AugSeptember: 4.56 in precipitation 4.6 SepOctober: 3.78 in precipitation 3.8 OctNovember: 3.22 in precipitation 3.2 NovDecember: 3.49 in precipitation 3.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Warrenton 3 Se, VA (6 mi away); precipitation: Nokesville 4.0 S, VA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

201397a
Casanova, VA · 2 mi
201197a
Catlett, VA · 3 mi
227287a
Midland, VA · 4 mi
227127a
Bealeton, VA · 7 mi
201877a
Warrenton, VA · 7 mi
201827a
Nokesville, VA · 7 mi
201817a
Nokesville, VA · 8 mi
201867a
Warrenton, VA · 9 mi

Virginia planting zones →

Questions about 20138

What planting zone is ZIP code 20138?

ZIP code 20138 (Calverton, 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 Calverton, VA?

The median last spring frost (32 °F) near 20138 is April 9; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Warrenton 3 Se station.

When is the first frost in Calverton, VA?

The median first fall frost near 20138 is November 1, giving a median frost-free growing season of 205 days.

When should I plant tomatoes in 20138?

Start tomato seeds indoors around Feb 12 – Feb 26 and set transplants outside around Apr 16 – Apr 30, one to three weeks after the median last frost.

How much rain and snow does 20138 get?

About 46 inches of precipitation a year (NOAA 1991–2020 normals, Nokesville 4.0 S station).

How hot do summers get in Calverton, VA?

The average high peaks at 85 °F in July, with about 21 days a year at 90 °F or more.

What kind of soil does 20138 have?

The USDA soil survey maps Albano at the center of ZIP 20138: silt loam, poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Calverton, VA in 2026?

Spring leaf-out near 20138 came on Mar 9 in 2026, about the same as the 1991–2020 average (Mar 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Calverton, VA?

Intermediate onions: the longest day near 20138 is 14 h 52 min, so day-neutral types bulb best; long-day varieties may not bulb fully.