Delmarva Peninsula spans USDA hardiness zones 7b-8a — a zone band wide enough that plant choice, not possibility, is the interesting question.
A flat coastal-plain peninsula of sandy, well-drained soils between the Chesapeake and the Atlantic — a major sweet-corn, soybean, and produce region. Growers here do well with tomato, sweet corn, holly, and peach — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Your yard isn't all of Delmarva Peninsula.
Delmarva Peninsula spans USDA zones 7b-8a, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Delmarva Peninsula — soil, climate, flood, and parcel records. How we handle your address.
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Delmarva Peninsula — the short answer
Delmarva Peninsula: USDA zones 7b-8a, 232–275 frost-free days depending where in it you stand, across 3 states.
- USDA zones
- 7b-8a
- USDA PHZM 2023, aggregated over the footprint
- Shortest season here
- 232 days
- NOAA Regional Climate Centers ACIS, 1991-2020 — Wicomico County
- Counties
- 14
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. The season figure is this region's own record, measured across its 14 member counties, not a state or national average.
Hardiness Zone Range
Delmarva Peninsula is not one growing season
One answer for Delmarva Peninsula averages 14 counties whose growing seasons are 43 days apart — from 232 frost-free days in Wicomico County to 275 in Northampton County. That is the same region, measured the same way, in the same years. Which end of it your land sits nearer decides what finishes before the first hard freeze.
The middle half of 14 counties runs 240–262 days, with a median of 248 days — a 43-day span end to end.
Measured across 14 member counties, each carrying its own 28°F normal. NOAA Regional Climate Centers ACIS, 1991-2020. A member with no own record is absent from the range rather than counted as zero — nothing here is interpolated to the region. Your own site sits somewhere inside this range; a parcel report resolves where.
Where the line runs inside Delmarva Peninsula
The middle half of Delmarva Peninsula runs 240–262 frost-free days, and 8 of its 14 counties sit outside that — 4 on the short side, 4 on the long. A regional planting date describes the middle well and the ends poorly, which is worth knowing before you follow one.
Under 240 frost-free days
4 counties
- Wicomico County · 232 days
- Caroline County · 233 days
- Sussex County · 238 days
3 of 4 shown
The end of the region that sets the planting calendar — start seed indoors here and the season stretches to meet the crop.
240–262 frost-free days
6 counties
0 of 6 shown
The middle half of the region, and the part a single regional season describes well.
Over 262 frost-free days
4 counties
- Northampton County · 275 days
- Talbot County · 270 days
- Accomack County · 268 days
3 of 4 shown
Long enough for a second succession of a quick crop after the first comes out.
Each county is placed by its OWN 28°F frost-free normal (NOAA Regional Climate Centers ACIS, 1991-2020), the same figure its own guide page publishes. Elevation, slope and cold-air drainage move a site within its county as well — which is the part only your address resolves.
What Grows in Delmarva Peninsula
All 2 of the plants below that publish a season requirement clear even Wicomico County’s 232 frost-free days — so on season alone, this grid works at both ends of the region. The 43-day spread still decides how far past this list you can push, and how early you can start.
Plants matched to Delmarva Peninsula's USDA zones 7b-8a, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of Delmarva Peninsula
Plants the USDA PLANTS Database documents as native and present in all 3 states this region crosses, kept only where the published hardiness range meets Delmarva Peninsula’s USDA zones 7b-8a — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across Delmarva Peninsula
The USDA soil survey maps this ground county by county. These are those records weighted by land area across 14 member counties — this region’s own profile, not a state figure.
The ground is predominantly Ultisols, at 80% of mapped acres, followed by Entisols (12%), Inceptisols (4%) and Histosols (2%). Six soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Fallsington, Othello, and Bojac.
28% of those acres are well drained, and another 22% poorly drained, 15% moderately well drained. Topsoil pH runs 4.0–6.5 between the lowest and the highest county on record. 30% of the footprint is classed prime farmland.
Soil order
Ultisols
Drainage
Well drained
Topsoil pH
4.0–6.5
Hydric soils
41%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Somerset County holds the most wetland ground here, at 75% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in Delmarva Peninsula
The soil survey reads this ground county by county, and the readings above are those records summed across Delmarva Peninsula. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records28% of the mapped acres across Delmarva Peninsula are well drained — ground that drains quickly. That is area-weighted across all 14 of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across Delmarva Peninsula runs pH 4.0–6.5 — acidic in 13 of its 14 counties.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Wet ground
From county recordsAbout 41% of the ground across Delmarva Peninsula is mapped as hydric — wetland — soil. Somerset County carries the most, at 75%.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across Delmarva Peninsula — and how to grow with it.
Across Delmarva Peninsula's 14 counties the federal record holds 12,279 documented sites, mostly Underground Storage Tanks (5,494), Nitrate (3,644) and Brownfields (2,038). The heaviest single county is New Castle County, with 3,080.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to Delmarva Peninsula to see which records sit where you actually grow.
Sources Checked
Summed across the 14 counties in Delmarva Peninsula
A note from Gnorman
What an experienced grower watches for around here
In and around Delmarva Peninsula, two things run higher than the national average across the 14 counties in Delmarva Peninsula — CAFO (645 sites) and Nitrate (3,644 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside Delmarva Peninsula
Everything above resolves to Delmarva Peninsula as a whole — a footprint whose own counties record seasons 43 days apart, and hardiness across zones 7b-8a. Your parcel sits at one point in that range, not in the middle of it. 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 region 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 regional average.
Your Lot vs Delmarva Peninsula Average
Delmarva Peninsula Average
- ●USDA Zones 7b-8a, averaged across Delmarva Peninsula
- ●One soil character for all of Delmarva Peninsula
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Delmarva Peninsula's 7b-8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Delmarva Peninsula
Pull a site-specific report for your exact address in Delmarva Peninsula — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Delmarva Peninsula averages can't show:
We read public map data around Delmarva Peninsula — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not Delmarva Peninsula average
How we know this about Delmarva Peninsula
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about Delmarva Peninsula
What hardiness zone is Delmarva Peninsula?
Delmarva Peninsula spans USDA hardiness zones 7b-8a, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in Delmarva Peninsula?
Measured between 28°F hard freezes, Delmarva Peninsula's counties mostly run 240 to 262 frost-free days, median 248 (NOAA Regional Climate Centers ACIS, 1991–2020, over 14 member counties). That 22-day spread is the honest read — no single season describes 14 counties, and each county guide below carries its own.
When does frost risk end in Delmarva Peninsula?
Across Delmarva Peninsula, the middle half of member counties see their last 28°F hard freeze between Mar 13 and Mar 23 (median Mar 21), and their first fall freeze between Nov 18 and Nov 30. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 11, and elevation decides which end of a 10-day spread you garden in.
What grows well in Delmarva Peninsula?
Delmarva Peninsula's conditions suit plants such as Tomato, Sweet Corn, Holly, Peach, Grape, Dogwood. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is Delmarva Peninsula defined?
Delmarva Peninsula is defined here as a curated cluster of 14 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does Delmarva Peninsula cover?
Delmarva Peninsula spans Delaware, Maryland, and Virginia. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Piedmont, Tidewater & Chesapeake, Blue Ridge, Hampton Roads / Coastal Southeast Virginia, and Shenandoah Valley share at least one state with Delmarva Peninsula. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at Delmarva Peninsula’s own scale
6 of the readings below were taken at Delmarva Peninsula's own scale — the zone 7b-8a band across its footprint, a median 248-day season across its 14 counties and 12,279 documented federal contamination records across its 14 counties, 3,080 of them in New Castle County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7b-8a aggregated across all 14 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 14 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 14 counties run 240 to 262 frost-free days, median 248NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 12,279 documented federal contamination records across its 14 counties, 3,080 of them in New Castle County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 80% Ultisols, topsoil pH 4.0–6.5, area-weighted across its 14 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — all 3 member states' curated sets, merged and filtered to zones 7b-8afrom Delaware, Maryland and Virginia
What this page can’t tell you
- Which end of the 22-day range your ground sits at — 240 days at one extreme, 262 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore Delmarva Peninsula
State growing guides
Counties in this region
Other growing regions across Delaware, Maryland, and Virginia
The vast eastern mountain region of steep hollows, thin acidic soils, and short upland seasons — apples, brambles, ramps, and forest crops on hard-won ground. (Union of the core Appalachian ecoregions.)
The rolling foothill belt between the Appalachians and the coastal plain, defined by heavy red clay soils that reward amendment and drainage. (Southern Piedmont; the Northern Piedmont is a separate ecoregion.)
The low, flat, tidal coastal plain around Chesapeake Bay — sandy soils, mild maritime winters, and a long season for vegetables and Southern staples.
The high, cool, forested spine of the southern Appalachians — layered ridges, acidic mountain loams, and a short upland season suited to apples and cold-hardy crops.
The only USDA zone 8b band in Virginia. Atlantic and Chesapeake Bay maritime moderation plus dense urban heat give the waterfront cities of Hampton Roads the state's warmest winters and longest season — roughly 276 to 289 frost-free days on the water (Hampton runs 289), about 60 days longer than the inland coastal plain and over 100 days longer than the mountains. Growers here overwinter hardy greens and roots, and figs and other tender perennials that fail elsewhere in Virginia routinely survive. Inland edges of the metro — Chesapeake, Suffolk, Isle of Wight, Newport News — cool to 8a, so the frost-free window shortens as you move off the tidal shoreline.
A fertile limestone valley between the Blue Ridge and Allegheny fronts — prime Virginia apple, livestock, and orchard country.