St. Ann, Missouri, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, hazelnut, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in St. Ann, 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. Ann 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. Ann — soil, climate, flood, and parcel records. How we handle your address.
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St. Ann — the short answer
St. Ann, Missouri: USDA zone 7a, about 247 days between hard freezes, across 2K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~247
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 7a is St. Ann's average, not your lot's — a low corner or a tree line moves it. Against St. Ann's 247-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in St. Ann
Each reading below is measured for St. Ann itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSt. Ann runs about 247 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
MeasuredSt. Ann sits in USDA hardiness zone 7a.
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. Ann is in
St. Ann sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at St. Ann's own centroid rather than borrowed from St. Louis County.
What Grows in St. Ann
Every plant below cleared St. Ann's own zone 7a and its 247-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in St. Ann?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 20 — 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 St. Ann
Survey cells within 31 miles of St. Ann checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 240 miles off. What to watch for.
What's on the federal record near St. Ann
Closest first, within ~10 miles of St. Ann. Listing isn't leaking, and distance isn't exposure.
- VILLAGE AUTO REPAIRUnderground Storage Tanks · 1200 ft
- FAMILY DOLLAR # 10067Brownfields · 1300 ft
- WALGREENS #15941Brownfields · 1400 ft
- HEYA WELLNESSBrownfields · 1400 ft
- A Z AUTO LLCBrownfields · 1400 ft
- SHOP N SAVE #17Underground Storage Tanks · 1600 ft
- CITY OF ST ANNUnderground Storage Tanks · 1700 ft
- CHARLES F. VATTEROTTUnderground Storage Tanks · 1800 ft
- SHOP N SAVE FUEL EXPRESS # 4529Brownfields · 1900 ft
- AMOCO SS #8546Underground Storage Tanks · 2000 ft
- CHEAP CHEAPUnderground Storage Tanks · 2400 ft
- KARSTEN EQUIPMENT COUnderground Storage Tanks · 2500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from St. Ann'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. Ann.
Sources Checked
within ~10 miles of St. Ann
Severity Distribution
within ~10 miles of St. Ann
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around St. Ann, Toxics Release Inventory runs higher than the national average — 225 sites within ~10 miles of St. Ann. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in St. Ann
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. Ann average
Your land is one point inside St. Ann
Everything above resolves to St. Ann as a whole — one PHZM band and one 28°F frost record, read across 2K 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 city 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. Ann Average
St. Ann Average
- ●USDA Zones 7a, averaged across St. Ann
- ●One soil character for all of St. Ann
- ●Frost dates read at St. Ann's scale: Mar 18 to Nov 20
YOUR Parcel
- ✓Your exact zone, not St. Ann's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in St. Ann
Pull a site-specific report for your exact address in St. Ann, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that St. Ann averages can't show:
We read public map data around St. Ann — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the St. Ann average
How we know this about St. Ann
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at St. Ann’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 city grain anywhere on this page — there is no city-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. Ann
When does frost risk typically end in St. Ann?
The last hard freeze (28°F) in St. Ann typically lands around Mar 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 Apr 8.
When is the first frost in St. Ann?
The first hard freeze (28°F) in St. Ann typically arrives around Nov 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 6, so the watching starts about Oct 21 — about 247 days after the spring freeze cleared.
How long is the growing season in St. Ann?
Measured between 28°F hard freezes, St. Ann sees about 247 frost-free days — roughly Mar 18 through Nov 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 8 to Nov 6, about 212 days.
Is the soil safe to grow vegetables in St. Ann?
The federal record around St. Ann is a meaningful one — 3,176 documented sites, mostly Underground Storage Tanks entries (1,912), the nearest Underground Storage Tanks 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 St. Ann?
From about Oct 21 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at St. Ann's scale — its 7a band and its 247-day season. Your yard writes its own version of St. Ann'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. Ann’s own scale
7 of the readings below were taken at St. Ann's own scale — its own ~247-day season between 28°F freezes, the 2,019 acres it covers and 3,176 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- St. Ann's own USDA hardiness band, zones 7aUSDA PHZM 2023
- St. Ann's own 28°F hard-freeze dates, about Mar 18 and Nov 20 and the ~247-day span between themNOAA 1991–2020 Climate Normals
- 3,176 documented contamination sites on the federal record near St. Ann, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- St. Ann's boundary and the 2,019 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~247-day seasonGrowable Ground crop-matching engine
- The ecoregion at St. Ann's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around St. Ann checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so St. Ann's 2,019 acres read through its county's SSURGO summaryfrom St. Louis County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom St. Louis County
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom St. Louis County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among St. Ann's 2,019 acreswhy one lot differs from the next →
- Which side of St. Ann you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,019 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 St. Ann-wide figureread your own land →
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