Allegany County, in Maryland, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, pawpaw, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Allegany County lies within Appalachia — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Allegany County holds more than one microclimate.
Soils and elevations shift across Allegany County, so your frost dates and drainage aren't the county average. 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 Allegany County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Allegany County — the short answer
Allegany County, Maryland: USDA zone 7a, about 209 days between hard freezes, across 270K acres.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 6
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~209
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 270K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 7a is Allegany County's average, not your lot's — a low corner or a tree line moves it. Against Allegany County's 209-day season, see what your own ground reads.
Heat in Allegany County
Across a year, Allegany County accumulates about 2,955 growing degree days above 50°F, about 909 fewer than the middle Maryland county — ahead of 1 of Maryland’s 24 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Allegany County
Across Allegany County, the ground is predominantly Inceptisols, where Weikert, Gilpin, and Berks are the most extensive named soil series. The soil is generally well drained with a channery silt loam surface. Topsoil pH runs about 4.5–5.1, very strongly acidic. Rainfall drains through hydrologic group D soils.
Soil order
Inceptisols
Drainage
Well drained
Prime farmland
4%
Hydric soils
1%
Soil still varies lot by lot — soil types explained.
How the ground varies across Allegany County
The USDA soil survey maps 65% of Allegany County as well drained — but another 33% drains differently: 20% moderately well drained, 11% somewhat excessively drained.
Weikert is the most extensive named soil at 26% of mapped acres, then Gilpin (6%) and Berks (5%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Allegany County
Each reading below is measured for Allegany County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Allegany County are well drained, in hydrologic group D — ground that drains quickly.
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
MeasuredTopsoil across Allegany County runs about pH 4.5–5.1, on the acidic side.
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
Season length
MeasuredAllegany County runs about 209 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
MeasuredAllegany County sits in USDA hardiness zone 7a.
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 Allegany County is in
Allegany County spans 2 EPA Level III ecoregions — Ridge and Valley (78%) and Central Appalachians (22%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Allegany County
We scored all 1,086 plants against Allegany County's own USDA zone 7a and its own 209-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Maryland profile.
Is it too late to plant in Allegany County?
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 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Allegany County
Spotted lanternfly documented 2 miles from Allegany County, first recorded 2022. What to watch for.
- Japanese beetle1 documented records
- monarch butterfly4 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Allegany County
USGS estimates 3,599 lb of Glyphosate on Allegany County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (1,479 lb) and Metolachlor-s (1,349 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Allegany County — and how to grow with it.
We checked the federal record across Allegany County — 530 documented sites across 6 of the 9 source types we track.
The most significant on record: 2 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Allegany County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Allegany County
Closest first, across Allegany County. Listing isn't leaking, and distance isn't exposure.
- LIMESTONE ROADSuperfund · 1.4 mi
- DIGGS SANITATION INCBrownfields · 1.6 mi
- AL Be 51Nitrate · 1.6 mi
- Carl G. Valentine & Sons, Inc.Underground Storage Tanks · 1.9 mi
- Phillips 66 Co #25022Underground Storage Tanks · 1.9 mi
- White Oaks SunocoUnderground Storage Tanks · 1.9 mi
- AL Be 31Nitrate · 2.0 mi
- District 16 Volunteer Fire DepartmentUnderground Storage Tanks · 2.3 mi
- Potomac Metal & Supply, Inc.Underground Storage Tanks · 2.3 mi
- Maple Run Youth CenterUnderground Storage Tanks · 2.3 mi
- FEDERAL EXPRESS - ZCMBBrownfields · 2.4 mi
- PENSKE TRUCK LEASING CO. LPBrownfields · 2.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Allegany County'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 Allegany County.
Sources Checked
across Allegany County
Severity Distribution
across Allegany County
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.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Allegany County
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 Allegany County average
Your land is one point inside Allegany County
Everything above resolves to Allegany County as a whole — one PHZM band and one county frost record, read across 270K 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 county 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 county average.
Your Lot vs the Allegany County Average
Allegany County Average
- ●USDA Zones 7a, averaged across Allegany County
- ●One soil character for all of Allegany County
- ●Frost dates read at Allegany County's scale: Apr 6 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Allegany County's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Allegany County
Pull a site-specific report for your exact address in Allegany County, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Allegany County averages can't show:
We read public map data around Allegany County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Allegany County average
How we know this about Allegany County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Allegany County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Allegany County
When does frost risk typically end in Allegany County?
The last hard freeze (28°F) in Allegany County typically lands around Apr 6, 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 27.
How long is the growing season in Allegany County?
Measured between 28°F hard freezes, Allegany County sees about 209 frost-free days — roughly Apr 6 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 27 to Oct 18, about 174 days.
Is the soil safe to grow vegetables in Allegany County?
The federal record around Allegany County is a meaningful one — 530 documented sites, mostly Underground Storage Tanks entries (318), the nearest Superfund record about 1.4 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.
Everything above is measured at Allegany County's scale — its 7a band and its 209-day season. Your yard writes its own version of Allegany County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Maryland's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Allegany County’s own scale
9 of the readings below were taken at Allegany County's own scale — its own ~209-day span between 28°F freezes, the 3 most extensive soil series mapped here and 530 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Allegany County's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Allegany County's own 28°F hard-freeze dates and its ~209-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Allegany CountyUSDA NRCS SSURGO
- 530 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Superfund record about 1.4 miles outFederal environmental registers
- Allegany County's boundary and the 270,207 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~209-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Allegany County spans, Ridge and Valley the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Allegany County for 2 tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Allegany County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Maryland grower plans around — written at state scale, so they stay on the state guidefrom Maryland
What this page can’t tell you
- How the season shifts across Allegany County — the ~209 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Allegany County's 270,207 acreswhy one lot differs from the next →
- Which of those 530 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Allegany Countyread your own land →