Difficult Run, Virginia, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The conditions favor cabbage, prickly pear, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Difficult Run, 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 Difficult Run 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 Difficult Run — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Difficult Run — the short answer
Difficult Run, Virginia: USDA zone 7b, about 227 days between hard freezes, across 5K acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 5K 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 Difficult Run's average, not your lot's — a low corner or a tree line moves it. Against Difficult Run's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Difficult Run
Each reading below is measured for Difficult Run itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDifficult Run runs about 227 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
MeasuredDifficult Run 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 Difficult Run is in
Difficult Run sits in the Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Difficult Run's own centroid rather than borrowed from Fairfax County.
What Grows in Difficult Run
Every plant below cleared Difficult Run's own zone 7b and its 227-day season. Each card opens that plant's Virginia profile. How we score.
Is it too late to plant in Difficult Run?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Difficult Run
Spotted lanternfly documented 3 miles from Difficult Run, first recorded 2022. What to watch for.
What's on the federal record near Difficult Run
Closest first, within ~10 miles of Difficult Run. Listing isn't leaking, and distance isn't exposure.
- TIMBERLAKEUnderground Storage Tanks · 0.7 mi
- Verizon Fox Mill Central OfficeUnderground Storage Tanks · 0.7 mi
- HEBRANK ROBERT EUnderground Storage Tanks · 1.2 mi
- Paul GardnerUnderground Storage Tanks · 1.6 mi
- 52V 25Nitrate · 1.7 mi
- SOUTH LAKES HIGH SCHOOLBrownfields · 1.7 mi
- SOUTH LAKES HIGH SCHOOLUnderground Storage Tanks · 1.7 mi
- SHADOWOOD CONDOMINIUM ASSOCUnderground Storage Tanks · 1.8 mi
- 7-ELEVEN #23427Underground Storage Tanks · 2.0 mi
- LAWYERS ROAD PARK & RIDEBrownfields · 2.0 mi
- FOX MILL FIRE STATION 31Underground Storage Tanks · 2.0 mi
- HUGHES MIDDLE SCHOOLUnderground Storage Tanks · 2.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Difficult Run'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 Difficult Run.
Total Sites
2,169
within ~10 miles of Difficult Run
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Difficult Run
Severity Distribution
within ~10 miles of Difficult Run
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 Difficult Run
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 Difficult Run average
Your land is one point inside Difficult Run
Everything above resolves to Difficult Run as a whole — one PHZM band and one 28°F frost record, read across 5K 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 Difficult Run Average
Difficult Run Average
- ●USDA Zones 7b, averaged across Difficult Run
- ●One soil character for all of Difficult Run
- ●Frost dates read at Difficult Run's scale: Mar 29 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Difficult Run's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Difficult Run
Pull a site-specific report for your exact address in Difficult Run, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Difficult Run averages can't show:
We read public map data around Difficult Run — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Difficult Run average
How we know this about Difficult Run
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 Difficult Run’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 Difficult Run
When does frost risk typically end in Difficult Run?
The last hard freeze (28°F) in Difficult Run typically lands around Mar 29, 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 19.
When is the first frost in Difficult Run?
The first hard freeze (28°F) in Difficult Run typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 227 days after the spring freeze cleared.
How long is the growing season in Difficult Run?
Measured between 28°F hard freezes, Difficult Run sees about 227 frost-free days — roughly Mar 29 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 28, about 192 days.
Is the soil safe to grow vegetables in Difficult Run?
The federal record around Difficult Run is a meaningful one — 2,169 documented sites, mostly Underground Storage Tanks entries (1,100), the nearest Underground Storage Tanks record about 0.7 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 Difficult Run?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Difficult Run's scale — its 7b band and its 227-day season. Your yard writes its own version of Difficult Run'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 Difficult Run’s own scale
7 of the readings below were taken at Difficult Run's own scale — its own ~227-day season between 28°F freezes, the 5,362 acres it covers and 2,169 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Difficult Run's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Difficult Run's own 28°F hard-freeze dates, about Mar 29 and Nov 11 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 2,169 documented contamination sites on the federal record near Difficult Run, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Difficult Run's boundary and the 5,362 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Difficult Run's own centroid, the PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Difficult Runlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Difficult Run's 5,362 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 Difficult Run's 5,362 acreswhy one lot differs from the next →
- Which side of Difficult Run you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,362 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 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 Difficult Run-wide figureread your own land →