Glen Allan, Mississippi, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Glen Allan, 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 Glen Allan 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 Glen Allan — soil, climate, flood, and parcel records. How we handle your address.
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Glen Allan — the short answer
Glen Allan, Mississippi: USDA zone 8b, about 288 days between hard freezes, across 3K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 18
- Washington County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 3
- Washington County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~288
- Washington County normal — NOAA 1991–2020, nearest to this town
- Town area
- 3K 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 Washington County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Glen Allan's average, not your lot's — a low corner or a tree line moves it. Against Glen Allan's 288-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Glen Allan
Each reading below is measured for Glen Allan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsGlen Allan runs about 288 days between hard freezes (read from Washington County, the closest normal to Glen Allan) — 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
MeasuredGlen Allan sits in USDA hardiness zone 8b.
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 Glen Allan is in
Glen Allan sits in the Mississippi Alluvial Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Glen Allan's own centroid rather than borrowed from Washington County.
What Grows in Glen Allan
Every plant below cleared Glen Allan's own zone 8b and its 288-day season. Each card opens that plant's Mississippi profile. How we score.
Is it too late to plant in Glen Allan?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 18 (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 Glen Allan
Closest first, within ~10 miles of Glen Allan. Listing isn't leaking, and distance isn't exposure.
- Tommy's Gulf StationUnderground Storage Tanks · 0.6 mi
- 151S0133 WASHINGTONNitrate · 0.8 mi
- 151S0194 WASHINGTON (Glen Allan)Nitrate · 1.1 mi
- 151S0211 WASHINGTONNitrate · 1.1 mi
- 151S0210 WASHINGTONNitrate · 1.1 mi
- 151S0209 WASHINGTONNitrate · 1.1 mi
- 151S0208 WASHINGTONNitrate · 1.1 mi
- Harrison's Grocery & CafeUnderground Storage Tanks · 1.2 mi
- 151S0049 WASHINGTONNitrate · 1.2 mi
- F W Reed IncUnderground Storage Tanks · 1.8 mi
- Midway StoreUnderground Storage Tanks · 2.7 mi
- Forest Glade PlantationUnderground Storage Tanks · 3.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Glen Allan'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 Glen Allan.
Total Sites
52
within ~10 miles of Glen Allan
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Glen Allan
Severity Distribution
within ~10 miles of Glen Allan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Glen Allan, Nitrate runs higher than the national average — 34 sites within ~10 miles of Glen Allan. 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 Glen Allan
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 Glen Allan average
Your land is one point inside Glen Allan
Everything above resolves to Glen Allan as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Washington 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 Glen Allan Average
Glen Allan Average
- ●USDA Zones 8b, averaged across Glen Allan
- ●One soil character for all of Glen Allan
- ●Frost dates read at Glen Allan's scale: Feb 18 to Dec 3
YOUR Parcel
- ✓Your exact zone, not Glen Allan's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Glen Allan
Pull a site-specific report for your exact address in Glen Allan, Mississippi — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Glen Allan averages can't show:
We read public map data around Glen Allan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Glen Allan average
How we know this about Glen Allan
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 Washington 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 Glen Allan
When does frost risk typically end in Glen Allan?
The last hard freeze (28°F) in Glen Allan typically lands around Feb 18, 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 11.
When is the first frost in Glen Allan?
The first hard freeze (28°F) in Glen Allan 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 288 days after the spring freeze cleared.
How long is the growing season in Glen Allan?
Measured between 28°F hard freezes, Glen Allan sees about 288 frost-free days — roughly Feb 18 through Dec 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 11 to Nov 19, about 253 days.
Is the soil safe to grow vegetables in Glen Allan?
The federal record around Glen Allan is a meaningful one — 52 documented sites, mostly Nitrate entries (34), the nearest Underground Storage Tanks record about 0.6 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 Glen Allan?
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 Glen Allan's scale — its 8b band and its 288-day season. Your yard writes its own version of Glen Allan'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 Glen Allan’s own scale
5 of the readings below were taken at Glen Allan's own scale — the 2,906 acres it covers and 52 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Glen Allan's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 52 documented contamination sites on the federal record near Glen Allan, the closest Underground Storage Tanks record about 0.6 miles out from the town centreFederal environmental registers
- Glen Allan's boundary and the 2,906 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~288-day seasonGrowable Ground crop-matching engine
- The ecoregion at Glen Allan's own centroid, the Mississippi Alluvial PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Glen Allan has no normal of its own, so its county's is the closest measured readfrom Washington County
- Soil character — no town-scale survey exists, so Glen Allan's 2,906 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 Mississippi grower plans around — written at state scale, so they stay on the state guidefrom Mississippi
- 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 Glen Allan's 2,906 acreswhy one lot differs from the next →
- Which side of Glen Allan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,906 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.6 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 Glen Allan-wide figureread your own land →
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