St. Charles, Arkansas, sits in USDA hardiness zone 8b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in St. Charles, 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 St. Charles 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 St. Charles — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
St. Charles — the short answer
St. Charles, Arkansas: USDA zone 8b, about 280 days between hard freezes, across 568 acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 22
- Arkansas County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 29
- Arkansas County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~280
- Arkansas County normal — NOAA 1991–2020, nearest to this town
- Town area
- 568 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 Arkansas County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is St. Charles's average, not your lot's — a low corner or a tree line moves it. Against St. Charles's 280-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in St. Charles
Each reading below is measured for St. Charles itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSt. Charles runs about 280 days between hard freezes (read from Arkansas County, the closest normal to St. Charles) — 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
MeasuredSt. Charles 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 St. Charles is in
St. Charles sits in the Mississippi Alluvial Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at St. Charles's own centroid rather than borrowed from Arkansas County.
What Grows in St. Charles
Every plant below cleared St. Charles's own zone 8b and its 280-day season. Each card opens that plant's Arkansas profile. How we score.
Is it too late to plant in St. Charles?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 29 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near St. Charles
Closest first, within ~10 miles of St. Charles. Listing isn't leaking, and distance isn't exposure.
- ST CHARLES COMMUNITY STOREUnderground Storage Tanks · 1500 ft
- 04S01W04ACC3Nitrate · 0.6 mi
- 04S01W08CCB1Nitrate · 1.2 mi
- 04S01W30AAA1Nitrate · 3.5 mi
- 04S01W28BAD1Nitrate · 3.7 mi
- COTTON KING BAIT SHOPUnderground Storage Tanks · 4.2 mi
- EDD'S BAIT SLONUnderground Storage Tanks · 4.6 mi
- 03S01W11DBB1Nitrate · 6.1 mi
- 04S02W28BAD1Nitrate · 6.5 mi
- NEW PEOPLES GINUnderground Storage Tanks · 7.0 mi
- CALLOWAY, DOUGLAS FARMSUnderground Storage Tanks · 7.0 mi
- CALLAWAY BROTHERS FARMUnderground Storage Tanks · 7.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from St. Charles'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 St. Charles.
Total Sites
28
within ~10 miles of St. Charles
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of St. Charles
Severity Distribution
within ~10 miles of St. Charles
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around St. Charles, Nitrate runs higher than the national average — 14 sites within ~10 miles of St. Charles. 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 St. Charles
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 St. Charles average
Your land is one point inside St. Charles
Everything above resolves to St. Charles as a whole — one PHZM band, read across 568 acres, with hard-freeze dates borrowed from Arkansas 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 St. Charles Average
St. Charles Average
- ●USDA Zones 8b, averaged across St. Charles
- ●One soil character for all of St. Charles
- ●Frost dates read at St. Charles's scale: Feb 22 to Nov 29
YOUR Parcel
- ✓Your exact zone, not St. Charles's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in St. Charles
Pull a site-specific report for your exact address in St. Charles, Arkansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that St. Charles averages can't show:
We read public map data around St. Charles — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the St. Charles average
How we know this about St. Charles
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 Arkansas 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 St. Charles
When does frost risk typically end in St. Charles?
The last hard freeze (28°F) in St. Charles typically lands around Feb 22, 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 15.
When is the first frost in St. Charles?
The first hard freeze (28°F) in St. Charles typically arrives around Nov 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 15, so the watching starts about Oct 30 — about 280 days after the spring freeze cleared.
How long is the growing season in St. Charles?
Measured between 28°F hard freezes, St. Charles sees about 280 frost-free days — roughly Feb 22 through Nov 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 15 to Nov 15, about 245 days.
Is the soil safe to grow vegetables in St. Charles?
The federal record around St. Charles is light — 28 documented sites across the 9 federal source types we checked, mostly Nitrate entries (14), the nearest Underground Storage Tanks record about 0.3 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in St. Charles?
From about Oct 30 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at St. Charles's scale — its 8b band and its 280-day season. Your yard writes its own version of St. Charles'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 St. Charles’s own scale
5 of the readings below were taken at St. Charles's own scale — the 568 acres it covers and 28 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- St. Charles's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 28 documented contamination sites on the federal record near St. Charles, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- St. Charles's boundary and the 568 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~280-day seasonGrowable Ground crop-matching engine
- The ecoregion at St. Charles's own centroid, the Mississippi Alluvial PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — St. Charles has no normal of its own, so its county's is the closest measured readfrom Arkansas County
- Soil character — no town-scale survey exists, so St. Charles's 568 acres read through its county's SSURGO summaryfrom Arkansas County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Arkansas County
- The growing challenges every Arkansas grower plans around — written at state scale, so they stay on the state guidefrom Arkansas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Arkansas County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among St. Charles's 568 acreswhy one lot differs from the next →
- Which side of St. Charles you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 568 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 St. Charles-wide figureread your own land →
More in Arkansas
Growing region
Nearby growing guides