Big Spring, Maryland, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Big Spring, 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 Big Spring 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 Big Spring — soil, climate, flood, and parcel records. How we handle your address.
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Big Spring — the short answer
Big Spring, Maryland: USDA zone 7a, about 215 days between hard freezes, across 89 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~215
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 89 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 7a is Big Spring's average, not your lot's — a low corner or a tree line moves it. Against Big Spring's 215-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Big Spring
Each reading below is measured for Big Spring itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBig Spring runs about 215 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
MeasuredBig Spring 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 Big Spring is in
Big Spring sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Big Spring's own centroid rather than borrowed from Washington County.
What Grows in Big Spring
Every plant below cleared Big Spring's own zone 7a and its 215-day season. Each card opens that plant's Maryland profile. How we score.
Is it too late to plant in Big Spring?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — 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 Big Spring
Spotted lanternfly documented 3 miles from Big Spring, first recorded 2021. What to watch for.
What's on the federal record near Big Spring
Closest first, within ~10 miles of Big Spring. Listing isn't leaking, and distance isn't exposure.
- Charlton Branch ElevatorUnderground Storage Tanks · 1200 ft
- WA Bf 25Nitrate · 0.8 mi
- SHA BRIDGE #2114300Brownfields · 1.3 mi
- SHA BRIDGE #2109700Brownfields · 1.3 mi
- Bragunier Masonry Contractors, Inc.Underground Storage Tanks · 1.4 mi
- BRAGUNIER FARM, LLCCAFO · 1.4 mi
- WA Bf 28Nitrate · 1.6 mi
- Strit, AllenUnderground Storage Tanks · 1.9 mi
- Clear Spring ExxonUnderground Storage Tanks · 1.9 mi
- Al's Pizza & Convenience BPUnderground Storage Tanks · 2.1 mi
- Clear Spring Volunteer Fire CompanyUnderground Storage Tanks · 2.1 mi
- Hi-Lo Oil Company, Inc. #653Underground Storage Tanks · 2.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Big Spring'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 Big Spring.
Total Sites
502
within ~10 miles of Big Spring
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Big Spring
Severity Distribution
within ~10 miles of Big Spring
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Big Spring, Nitrate runs higher than the national average — 184 sites within ~10 miles of Big Spring. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Big Spring
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 Big Spring average
Your land is one point inside Big Spring
Everything above resolves to Big Spring as a whole — one PHZM band and one 28°F frost record, read across 89 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 Big Spring Average
Big Spring Average
- ●USDA Zones 7a, averaged across Big Spring
- ●One soil character for all of Big Spring
- ●Frost dates read at Big Spring's scale: Apr 3 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Big Spring's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Big Spring
Pull a site-specific report for your exact address in Big Spring, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Big Spring averages can't show:
We read public map data around Big Spring — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Big Spring average
How we know this about Big Spring
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 Big Spring’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 Big Spring
When does frost risk typically end in Big Spring?
The last hard freeze (28°F) in Big Spring typically lands around Apr 3, 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 24.
When is the first frost in Big Spring?
The first hard freeze (28°F) in Big Spring typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 215 days after the spring freeze cleared.
How long is the growing season in Big Spring?
Measured between 28°F hard freezes, Big Spring sees about 215 frost-free days — roughly Apr 3 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 21, about 180 days.
Is the soil safe to grow vegetables in Big Spring?
The federal record around Big Spring is a meaningful one — 502 documented sites, mostly Nitrate entries (184), 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 Big Spring?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Big Spring's scale — its 7a band and its 215-day season. Your yard writes its own version of Big Spring'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 Big Spring’s own scale
7 of the readings below were taken at Big Spring's own scale — its own ~215-day season between 28°F freezes, the 89 acres it covers and 502 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Big Spring's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Big Spring's own 28°F hard-freeze dates, about Apr 3 and Nov 4 and the ~215-day span between themNOAA 1991–2020 Climate Normals
- 502 documented contamination sites on the federal record near Big Spring, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Big Spring's boundary and the 89 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~215-day seasonGrowable Ground crop-matching engine
- The ecoregion at Big Spring's own centroid, the Ridge and ValleyUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Big Springlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Big Spring's 89 acres read through its county's SSURGO summaryfrom Washington County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washington County
- The growing challenges every Maryland grower plans around — written at state scale, so they stay on the state guidefrom Maryland
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Washington County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Big Spring's 89 acreswhy one lot differs from the next →
- Which side of Big Spring you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 89 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 Big Spring-wide figureread your own land →