Grand Bay, Alabama, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include artichoke, fig, california poppy, and cabbage — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Grand Bay, 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 Grand Bay 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 Grand Bay — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Grand Bay — the short answer
Grand Bay, Alabama: USDA zone 9a, about 297 days between hard freezes, across 6K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 9
- Mobile County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 3
- Mobile County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~297
- Mobile County normal — NOAA 1991–2020, nearest to this town
- Town area
- 6K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Mobile County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Grand Bay's average, not your lot's — a low corner or a tree line moves it. Against Grand Bay's 297-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grand Bay
Each reading below is measured for Grand Bay itself — here is what it means for a garden here, and the move an experienced grower makes about it.

Season length
From county recordsGrand Bay runs about 297 days between hard freezes (read from Mobile County, the closest normal to Grand Bay) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals

Winter hardiness
MeasuredGrand Bay sits in USDA hardiness zone 9a.
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 Grand Bay is in
Grand Bay sits in the Southeastern Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Grand Bay's own centroid rather than borrowed from Mobile County.
What Grows in Grand Bay
Every plant below cleared Grand Bay's own zone 9a and its 297-day season. Each card opens that plant's Alabama profile. How we score.






























Is it too late to plant in Grand Bay?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 3 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Grand Bay
Closest first, within ~10 miles of Grand Bay. Listing isn't leaking, and distance isn't exposure.
- BIRD-JOHNSON COMPANYToxics Release Inventory · 1100 ft
- CTC CENTRAL OFFICEUnderground Storage Tanks · 1200 ft
- THONI OIL MAGIC BENZOL GAS STAT INCUnderground Storage Tanks · 1200 ft
- GRAND BAY GROCERYUnderground Storage Tanks · 1900 ft
- GRAND BAY STANDARDUnderground Storage Tanks · 2100 ft
- GRAND BAY WATER WORKS BOARDPFAS · 2300 ft
- Well II-4 USGS 302836088202001 Mobile Cnty ALNitrate · 2400 ft
- WALGREENS #10168Brownfields · 0.5 mi
- TRACKSIDE 5024Underground Storage Tanks · 0.5 mi
- BROOKS GULF SERVICEUnderground Storage Tanks · 0.5 mi
- CVS PHARMACY #4782Brownfields · 0.6 mi
- MINUTE MARTUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Grand Bay'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 Grand Bay.
Total Sites
206
within ~10 miles of Grand Bay
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Grand Bay
Severity Distribution
within ~10 miles of Grand Bay
Highest-Severity Sites

A note from Gnorman
What an experienced grower watches for around here
In and around Grand Bay, Nitrate runs higher than the national average — 72 sites within ~10 miles of Grand Bay. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Grand Bay
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 Grand Bay average
Your land is one point inside Grand Bay
Everything above resolves to Grand Bay as a whole — one PHZM band, read across 6K acres, with hard-freeze dates borrowed from Mobile County’s record because no 30-year normal resolves at this town’s own centroid. 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 Grand Bay Average
Grand Bay Average
- ●USDA Zones 9a, averaged across Grand Bay
- ●One soil character for all of Grand Bay
- ●Frost dates read at Grand Bay's scale: Feb 9 to Dec 3
YOUR Parcel
- ✓Your exact zone, not Grand Bay's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grand Bay
Pull a site-specific report for your exact address in Grand Bay, Alabama — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grand Bay averages can't show:
We read public map data around Grand Bay — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grand Bay average
How we know this about Grand Bay
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 Mobile County’s record, because none resolves here; 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 Grand Bay
When does frost risk typically end in Grand Bay?
The last hard freeze (28°F) in Grand Bay typically lands around Feb 9, 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 Mar 2.
When is the first frost in Grand Bay?
The first hard freeze (28°F) in Grand Bay typically arrives around Dec 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 19, so the watching starts about Nov 3 — about 297 days after the spring freeze cleared.
How long is the growing season in Grand Bay?
Measured between 28°F hard freezes, Grand Bay sees about 297 frost-free days — roughly Feb 9 through Dec 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 2 to Nov 19, about 262 days.
Is the soil safe to grow vegetables in Grand Bay?
The federal record around Grand Bay is a meaningful one — 206 documented sites, mostly Nitrate entries (72), the nearest Toxics Release Inventory 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 Grand Bay?
From about Nov 3 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 Dec 3 (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 Dec 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Grand Bay's scale — its 9a band and its 297-day season. Your yard writes its own version of Grand Bay'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 Grand Bay’s own scale
5 of the readings below were taken at Grand Bay's own scale — the 5,552 acres it covers and 206 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Grand Bay's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 206 documented contamination sites on the federal record near Grand Bay, the closest Toxics Release Inventory record about 0.2 miles out from the town centreFederal environmental registers
- Grand Bay's boundary and the 5,552 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~297-day seasonGrowable Ground crop-matching engine
- The ecoregion at Grand Bay's own centroid, the Southeastern PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Grand Bay has no normal of its own, so its county's is the closest measured readfrom Mobile County
- Soil character — no town-scale survey exists, so Grand Bay's 5,552 acres read through its county's SSURGO summaryfrom Mobile County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Mobile County
- The growing challenges every Alabama grower plans around — written at state scale, so they stay on the state guidefrom Alabama
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Mobile County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Grand Bay's 5,552 acreswhy one lot differs from the next →
- Which side of Grand Bay you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,552 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory 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 Grand Bay-wide figureread your own land →
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