Sully Square, Virginia, sits in USDA hardiness zone 7b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, prickly pear, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Sully Square, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Sully Square lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Sully Square — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Sully Square — the short answer
Sully Square, Virginia: USDA zone 7b, about 224 days between hard freezes, across 508 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~224
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 508 acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 7b is Sully Square's average, not your lot's — a low corner or a tree line moves it. Against Sully Square's 224-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sully Square
Each reading below is measured for Sully Square itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSully Square runs about 224 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSully Square sits in USDA hardiness zone 7b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Sully Square is in
Sully Square sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Sully Square's own centroid, and it is not what its county reads: Fairfax County is mostly Piedmont. The wider page above you is answering a different question about different ground.
What Grows in Sully Square
Every plant below cleared Sully Square's own zone 7b and its 224-day season. Each card opens that plant's Virginia profile. How we score.
Is it too late to plant in Sully Square?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 28; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 7 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Sully Square
Spotted lanternfly documented 1 miles from Sully Square, first recorded 2022. What to watch for.
What's on the federal record near Sully Square
Closest first, within ~10 miles of Sully Square. Listing isn't leaking, and distance isn't exposure.
- Enterprise Services Limited Liability CorpUnderground Storage Tanks · 1100 ft
- FEDERAL EXPRESS CORP BCBABrownfields · 2100 ft
- International PointUnderground Storage Tanks · 2200 ft
- INTERNATIONAL POINTBrownfields · 2300 ft
- RAYTHEON TRAINING INCBrownfields · 2300 ft
- DULLES DISCOVERYBrownfields · 2500 ft
- Dulles DiscoveryUnderground Storage Tanks · 2500 ft
- CVS PHARMACY #2155Brownfields · 2500 ft
- MERIT CLEANERSBrownfields · 2600 ft
- NATIONAL AIR & SPACE MUSEUM, STEVEN F. UDVAR-HAZY CENTERBrownfields · 2600 ft
- McLearen ShellUnderground Storage Tanks · 2600 ft
- BRITISH AEROSPACE INCBrownfields · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sully Square's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Sully Square.
Sources Checked
within ~10 miles of Sully Square
Severity Distribution
within ~10 miles of Sully Square
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in Sully Square
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Sully Square average
Your land is one point inside Sully Square
Everything above resolves to Sully Square as a whole — one PHZM band and one 28°F frost record, read across 508 acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Sully Square Average
Sully Square Average
- ●USDA Zones 7b, averaged across Sully Square
- ●One soil character for all of Sully Square
- ●Frost dates read at Sully Square's scale: Mar 28 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Sully Square's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sully Square
Pull a site-specific report for your exact address in Sully Square, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sully Square averages can't show:
We read public map data around Sully Square — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sully Square average
How we know this about Sully Square
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Sully Square’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Sully Square
When does frost risk typically end in Sully Square?
The last hard freeze (28°F) in Sully Square typically lands around Mar 28, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 18.
When is the first frost in Sully Square?
The first hard freeze (28°F) in Sully Square typically arrives around Nov 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 24, so the watching starts about Oct 8 — about 224 days after the spring freeze cleared.
How long is the growing season in Sully Square?
Measured between 28°F hard freezes, Sully Square sees about 224 frost-free days — roughly Mar 28 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Oct 24, about 189 days.
Is the soil safe to grow vegetables in Sully Square?
The federal record around Sully Square is a meaningful one — 1,641 documented sites, mostly Underground Storage Tanks entries (765), the nearest Underground Storage Tanks record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Sully Square?
From about Oct 8 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 7 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sully Square's scale — its 7b band and its 224-day season. Your yard writes its own version of Sully Square's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Sully Square’s own scale
7 of the readings below were taken at Sully Square's own scale — its own ~224-day season between 28°F freezes, the 508 acres it covers and 1,641 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sully Square's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Sully Square's own 28°F hard-freeze dates, about Mar 28 and Nov 7 and the ~224-day span between themNOAA 1991–2020 Climate Normals
- 1,641 documented contamination sites on the federal record near Sully Square, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Sully Square's boundary and the 508 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~224-day seasonGrowable Ground crop-matching engine
- Sully Square sits in the Northern Piedmont — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Sully Squarelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sully Square's 508 acres read through its county's SSURGO summaryfrom Fairfax County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Fairfax County
- The growing challenges every Virginia grower plans around — written at state scale, so they stay on the state guidefrom Virginia
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Fairfax County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sully Square's 508 acreswhy one lot differs from the next →
- Which side of Sully Square you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 508 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Sully Square-wide figureread your own land →