Chantilly, Virginia, sits in USDA hardiness zone 7b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include cabbage, prickly pear, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Chantilly, 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 Chantilly 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 Chantilly — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Chantilly — the short answer
Chantilly, Virginia: USDA zone 7b, about 222 days between hard freezes, across 8K 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 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~222
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 8K 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 Chantilly's average, not your lot's — a low corner or a tree line moves it. Against Chantilly's 222-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Chantilly
Each reading below is measured for Chantilly itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredChantilly runs about 222 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
MeasuredChantilly 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 Chantilly is in
Chantilly sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Chantilly'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 Chantilly
Every plant below cleared Chantilly's own zone 7b and its 222-day season. Each card opens that plant's Virginia profile. How we score.
Is it too late to plant in Chantilly?
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 5 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Chantilly
Spotted lanternfly documented 3 miles from Chantilly, first recorded 2022. What to watch for.
What's on the federal record near Chantilly
Closest first, within ~10 miles of Chantilly. Listing isn't leaking, and distance isn't exposure.
- WALMART SUPERCENTER #5969Brownfields · 550 ft
- DYNEX TECH INCBrownfields · 750 ft
- TV ANSWERBrownfields · 900 ft
- DULLES INTL'L MOTORSPORT LTDBrownfields · 1100 ft
- LABCORP-CHANTILLYBrownfields · 1100 ft
- CLEANERS AMERICABrownfields · 1200 ft
- PAGE AVJET CORPORATIONUnderground Storage Tanks · 1300 ft
- FRED NEWTON PAVING INCUnderground Storage Tanks · 1300 ft
- TAXI CAB PADUnderground Storage Tanks · 1300 ft
- DULLES GTE FACILITYUnderground Storage Tanks · 1300 ft
- ALLIED AVIATION FUELING CO OF VAUnderground Storage Tanks · 1300 ft
- FAA AAFSFO-8404Underground Storage Tanks · 1300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Chantilly'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 Chantilly.
Total Sites
1,834
within ~10 miles of Chantilly
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Chantilly
Severity Distribution
within ~10 miles of Chantilly
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 Chantilly
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 Chantilly average
Your land is one point inside Chantilly
Everything above resolves to Chantilly as a whole — one PHZM band and one 28°F frost record, read across 8K 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 Chantilly Average
Chantilly Average
- ●USDA Zones 7b, averaged across Chantilly
- ●One soil character for all of Chantilly
- ●Frost dates read at Chantilly's scale: Mar 28 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Chantilly's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Chantilly
Pull a site-specific report for your exact address in Chantilly, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Chantilly averages can't show:
We read public map data around Chantilly — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Chantilly average
How we know this about Chantilly
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 Chantilly’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 Chantilly
When does frost risk typically end in Chantilly?
The last hard freeze (28°F) in Chantilly 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 Chantilly?
The first hard freeze (28°F) in Chantilly typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 222 days after the spring freeze cleared.
How long is the growing season in Chantilly?
Measured between 28°F hard freezes, Chantilly sees about 222 frost-free days — roughly Mar 28 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 18 to Oct 22, about 187 days.
Is the soil safe to grow vegetables in Chantilly?
The federal record around Chantilly is a meaningful one — 1,834 documented sites, mostly Underground Storage Tanks entries (858), the nearest Brownfields record about 0.1 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 Chantilly?
From about Oct 6 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Chantilly's scale — its 7b band and its 222-day season. Your yard writes its own version of Chantilly'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 Chantilly’s own scale
7 of the readings below were taken at Chantilly's own scale — its own ~222-day season between 28°F freezes, the 7,681 acres it covers and 1,834 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Chantilly's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Chantilly's own 28°F hard-freeze dates, about Mar 28 and Nov 5 and the ~222-day span between themNOAA 1991–2020 Climate Normals
- 1,834 documented contamination sites on the federal record near Chantilly, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Chantilly's boundary and the 7,681 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~222-day seasonGrowable Ground crop-matching engine
- Chantilly sits in the Northern Piedmont — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Chantillylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Chantilly's 7,681 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 Chantilly's 7,681 acreswhy one lot differs from the next →
- Which side of Chantilly you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 7,681 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Chantilly-wide figureread your own land →