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

Planting zone for 22039 — Fairfax Station, VA

ZIP code 22039 (Fairfax Station, Fairfax County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 12 and the first fall frost October 27.

Where ZIP 22039 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 12
First frostOct 27
2012 zone7a

Was 7a on the 2012 map — half a zone warmer now. 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 Fairfax Station, 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 Fairfax Station, VA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 12median — 50% chance of a later frost
Safe for tender plantsApril 24only 10% chance of frost after
First fall frostOctober 27median — 10% chance by Oct 13
Growing season197 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around November 5.

From the NOAA station Manassas, VA — 10 miles away, elevation 246 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 22039

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 1 – Mar 15
SpinachSow outdoors · Mar 1 – Mar 22
Broccoli, cabbageStart indoors · Feb 1 – Feb 15
Broccoli, cabbageTransplant · Mar 22 – Apr 5
Onion setsPlant outdoors · Mar 15 – Mar 29
PotatoesPlant outdoors · Mar 22 – Apr 5
LettuceSow outdoors · Mar 15 – Mar 29
Carrots, beetsSow outdoors · Mar 22 – Apr 5
TomatoesStart indoors · Feb 15 – Mar 1
TomatoesTransplant · Apr 19 – May 3
Peppers, eggplantStart indoors · Feb 1 – Feb 15
Peppers, eggplantTransplant · Apr 26 – May 10
BeansSow outdoors · Apr 19 – May 3
Sweet cornSow outdoors · Apr 19 – May 3
Cucumbers, squashSow outdoors · Apr 19 – May 3
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 12) 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 22039 came on Mar 10 — 4 days earlier than the 1991–2020 average (Mar 14).

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).

Soil in Fairfax Station, VA

The soil mapped at the center of ZIP 22039 is Codorus — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2%moderate
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Codorus and Hatboro soils, 0 to 2 percent slopes, occasionally 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 22039; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fairfax Station, VA

Summer high88 °Faverage high, July
Winter low24 °Faverage low, January
Hot days41days a year at 90 °F or more
Freezing nights94nights a year at 32 °F or less
Growing degree days3,908base 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
Precipitation47.1 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 24 °F 42°24° JanFebruary: average high 46 °F, low 26 °F 46°26° FebMarch: average high 54 °F, low 32 °F 54°32° MarApril: average high 66 °F, low 43 °F 66°43° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 64 °F 83°64° JunJuly: average high 88 °F, low 69 °F 88°69° JulAugust: average high 85 °F, low 67 °F 85°67° 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 35 °F 56°35° NovDecember: average high 47 °F, low 29 °F 47°29° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.17 in precipitation 3.2 JanFebruary: 2.96 in precipitation 3.0 FebMarch: 3.90 in precipitation 3.9 MarApril: 3.62 in precipitation 3.6 AprMay: 4.31 in precipitation 4.3 MayJune: 4.90 in precipitation 4.9 JunJuly: 4.43 in precipitation 4.4 JulAugust: 4.05 in precipitation 4.0 AugSeptember: 4.65 in precipitation 4.7 SepOctober: 3.99 in precipitation 4.0 OctNovember: 3.39 in precipitation 3.4 NovDecember: 3.74 in precipitation 3.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Manassas, VA (10 mi away); precipitation: Woodbridge 5.9 Nw, VA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

220157b
Burke, VA · 3 mi
221537b
Springfield, VA · 4 mi
221927b
Woodbridge, VA · 4 mi
201247b
Clifton, VA · 5 mi
221527b
Springfield, VA · 5 mi
220327b
Fairfax, VA · 5 mi
221257b
Occoquan, VA · 5 mi
221997b
Lorton, VA · 6 mi

Virginia planting zones →

Questions about 22039

What planting zone is ZIP code 22039?

ZIP code 22039 (Fairfax Station, VA) 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 Fairfax Station, VA?

The median last spring frost (32 °F) near 22039 is April 12; after April 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Manassas station.

When is the first frost in Fairfax Station, VA?

The median first fall frost near 22039 is October 27, giving a median frost-free growing season of 197 days.

When should I plant tomatoes in 22039?

Start tomato seeds indoors around Feb 15 – Mar 1 and set transplants outside around Apr 19 – May 3, one to three weeks after the median last frost.

How much rain and snow does 22039 get?

About 47.1 inches of precipitation a year (NOAA 1991–2020 normals, Woodbridge 5.9 Nw station).

How hot do summers get in Fairfax Station, VA?

The average high peaks at 88 °F in July, with about 41 days a year at 90 °F or more.

What kind of soil does 22039 have?

The USDA soil survey maps Codorus at the center of ZIP 22039: silt loam, somewhat poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Fairfax Station, VA in 2026?

Spring leaf-out near 22039 came on Mar 10 in 2026, 4 days earlier than the 1991–2020 average (Mar 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Fairfax Station, VA?

Intermediate onions: the longest day near 22039 is 14 h 53 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 22039 change?

Yes. The 2012 USDA map put 22039 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.