Callaway, Maryland, sits in USDA hardiness zone 8a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include cabbage, fig, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Callaway, 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 Callaway 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 Callaway — soil, climate, flood, and parcel records. How we handle your address.
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Callaway — the short answer
Callaway, Maryland: USDA zone 8a, about 256 days between hard freezes, across 3K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~256
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 8a is Callaway's average, not your lot's — a low corner or a tree line moves it. Against Callaway's 256-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Callaway
Each reading below is measured for Callaway itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCallaway runs about 256 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
MeasuredCallaway sits in USDA hardiness zone 8a.
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 Callaway is in
Callaway sits in the Southeastern Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Callaway's own centroid rather than borrowed from St. Mary's County.
What Grows in Callaway
Every plant below cleared Callaway's own zone 8a and its 256-day season. Each card opens that plant's Maryland profile. How we score.
Is it too late to plant in Callaway?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 28 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Callaway
Spotted lanternfly documented 11 miles from Callaway, first recorded 2019. What to watch for.
What's on the federal record near Callaway
Closest first, within ~10 miles of Callaway. Listing isn't leaking, and distance isn't exposure.
- Callaway ShellUnderground Storage Tanks · 2300 ft
- Callaway USA FuelUnderground Storage Tanks · 2400 ft
- DOLLAR GENERAL STORE #21651Brownfields · 0.5 mi
- Bob's SunocoUnderground Storage Tanks · 0.8 mi
- St. Mary's Auto BodyUnderground Storage Tanks · 0.9 mi
- Bean's Bar & GroceryUnderground Storage Tanks · 0.9 mi
- SM Ee 38Nitrate · 1.1 mi
- Smith & SonUnderground Storage Tanks · 1.2 mi
- Walter Meinhardt PropertyUnderground Storage Tanks · 1.4 mi
- James N. DysonUnderground Storage Tanks · 1.4 mi
- A & M GlassUnderground Storage Tanks · 1.4 mi
- Great Mills WWPSUnderground Storage Tanks · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Callaway'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 Callaway.
Sources Checked
within ~10 miles of Callaway
Severity Distribution
within ~10 miles of Callaway
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Callaway, two things run higher than the national average within ~10 miles of Callaway — Nitrate (150 sites) and PFAS (4 sites). 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.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Callaway
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 Callaway average
Your land is one point inside Callaway
Everything above resolves to Callaway as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Callaway Average
Callaway Average
- ●USDA Zones 8a, averaged across Callaway
- ●One soil character for all of Callaway
- ●Frost dates read at Callaway's scale: Mar 17 to Nov 28
YOUR Parcel
- ✓Your exact zone, not Callaway's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Callaway
Pull a site-specific report for your exact address in Callaway, Maryland — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Callaway averages can't show:
We read public map data around Callaway — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Callaway average
How we know this about Callaway
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 Callaway’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 Callaway
When does frost risk typically end in Callaway?
The last hard freeze (28°F) in Callaway typically lands around Mar 17, 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 7.
When is the first frost in Callaway?
The first hard freeze (28°F) in Callaway typically arrives around Nov 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 14, so the watching starts about Oct 29 — about 256 days after the spring freeze cleared.
How long is the growing season in Callaway?
Measured between 28°F hard freezes, Callaway sees about 256 frost-free days — roughly Mar 17 through Nov 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 7 to Nov 14, about 221 days.
Is the soil safe to grow vegetables in Callaway?
The federal record around Callaway is a meaningful one — 462 documented sites, mostly Underground Storage Tanks entries (206), the nearest Underground Storage Tanks record about 0.4 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.
How do I protect my plants from frost in Callaway?
From about Oct 29 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Callaway's scale — its 8a band and its 256-day season. Your yard writes its own version of Callaway'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 Callaway’s own scale
7 of the readings below were taken at Callaway's own scale — its own ~256-day season between 28°F freezes, the 3,049 acres it covers and 462 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Callaway's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Callaway's own 28°F hard-freeze dates, about Mar 17 and Nov 28 and the ~256-day span between themNOAA 1991–2020 Climate Normals
- 462 documented contamination sites on the federal record near Callaway, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Callaway's boundary and the 3,049 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~256-day seasonGrowable Ground crop-matching engine
- The ecoregion at Callaway's own centroid, the Southeastern PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Callawaylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Callaway's 3,049 acres read through its county's SSURGO summaryfrom St. Mary's County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom St. Mary's 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 St. Mary's County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Callaway's 3,049 acreswhy one lot differs from the next →
- Which side of Callaway you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,049 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Callaway-wide figureread your own land →
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