Arnold Line, Mississippi, sits in USDA hardiness zone 8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Reliable performers under these conditions include cabbage, fig, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Arnold Line, 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 Arnold Line 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 Arnold Line — soil, climate, flood, and parcel records. How we handle your address.
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Arnold Line — the short answer
Arnold Line, Mississippi: USDA zone 8b, about 290 days between hard freezes, across 1K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 16
- Lamar County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 3
- Lamar County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~290
- Lamar County normal — NOAA 1991–2020, nearest to this town
- Town area
- 1K 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 Lamar County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Arnold Line's average, not your lot's — a low corner or a tree line moves it. Against Arnold Line's 290-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Arnold Line
Each reading below is measured for Arnold Line itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsArnold Line runs about 290 days between hard freezes (read from Lamar County, the closest normal to Arnold Line) — 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
MeasuredArnold Line 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 Arnold Line is in
Arnold Line sits in the Southeastern Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Arnold Line's own centroid rather than borrowed from Lamar County.
What Grows in Arnold Line
Every plant below cleared Arnold Line's own zone 8b and its 290-day season. Each card opens that plant's Mississippi profile. How we score.
Is it too late to plant in Arnold Line?
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 Jan 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 16 (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 Arnold Line
Closest first, within ~10 miles of Arnold Line. Listing isn't leaking, and distance isn't exposure.
- 073E0134 LAMARNitrate · 1800 ft
- Keith's # 137Underground Storage Tanks · 2000 ft
- UNIVERSITY OF SOUTHERN MISSISSIPPIBrownfields · 0.6 mi
- SCIGENESIS, LLCBrownfields · 0.6 mi
- THE UNIVERSITY OF SOUTHERN MISSISSIPPI: THE ACCELERATORBrownfields · 0.6 mi
- 073E0223 LAMARNitrate · 0.7 mi
- SEARS, ROEBUCK AND COMAPNY 1306 6154Brownfields · 1.0 mi
- Texaco Food Mart #8Underground Storage Tanks · 1.0 mi
- Fast Mart #16Underground Storage Tanks · 1.0 mi
- WALGREENS #7579Brownfields · 1.0 mi
- LOWE'S OF HATTIESBURG, MS #537Brownfields · 1.1 mi
- 035A0023 FORRESTNitrate · 1.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Arnold Line'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 Arnold Line.
Sources Checked
within ~10 miles of Arnold Line
Severity Distribution
within ~10 miles of Arnold Line
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 Arnold Line
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 Arnold Line average
Your land is one point inside Arnold Line
Everything above resolves to Arnold Line as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from Lamar 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 Arnold Line Average
Arnold Line Average
- ●USDA Zones 8b, averaged across Arnold Line
- ●One soil character for all of Arnold Line
- ●Frost dates read at Arnold Line's scale: Feb 16 to Dec 3
YOUR Parcel
- ✓Your exact zone, not Arnold Line's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Arnold Line
Pull a site-specific report for your exact address in Arnold Line, Mississippi — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Arnold Line averages can't show:
We read public map data around Arnold Line — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Arnold Line average
How we know this about Arnold Line
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 Lamar 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 Arnold Line
When does frost risk typically end in Arnold Line?
The last hard freeze (28°F) in Arnold Line typically lands around Feb 16, 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 9.
When is the first frost in Arnold Line?
The first hard freeze (28°F) in Arnold Line 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 290 days after the spring freeze cleared.
How long is the growing season in Arnold Line?
Measured between 28°F hard freezes, Arnold Line sees about 290 frost-free days — roughly Feb 16 through Dec 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 9 to Nov 19, about 255 days.
Is the soil safe to grow vegetables in Arnold Line?
The federal record around Arnold Line is a meaningful one — 515 documented sites, mostly Underground Storage Tanks entries (313), the nearest Nitrate record about 0.3 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 Arnold Line?
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 Arnold Line's scale — its 8b band and its 290-day season. Your yard writes its own version of Arnold Line'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 Arnold Line’s own scale
5 of the readings below were taken at Arnold Line's own scale — the 1,064 acres it covers and 515 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Arnold Line's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 515 documented contamination sites on the federal record near Arnold Line, the closest Nitrate record about 0.3 miles out from the town centreFederal environmental registers
- Arnold Line's boundary and the 1,064 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~290-day seasonGrowable Ground crop-matching engine
- The ecoregion at Arnold Line's own centroid, the Southeastern PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Arnold Line has no normal of its own, so its county's is the closest measured readfrom Lamar County
- Soil character — no town-scale survey exists, so Arnold Line's 1,064 acres read through its county's SSURGO summaryfrom Lamar County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lamar 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 Lamar County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Arnold Line's 1,064 acreswhy one lot differs from the next →
- Which side of Arnold Line you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,064 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.3 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 Arnold Line-wide figureread your own land →