Polo, Missouri, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Well-matched crops include cabbage, hazelnut, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Polo, 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 Polo 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 Polo — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Polo — the short answer
Polo, Missouri: USDA zone 6a, about 208 days between hard freezes, across 394 acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~208
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 394 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 6a is Polo's average, not your lot's — a low corner or a tree line moves it. Against Polo's 208-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Polo
Each reading below is measured for Polo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPolo runs about 208 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
MeasuredPolo sits in USDA hardiness zone 6a.
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 Polo is in
Polo sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Polo's own centroid rather than borrowed from Caldwell County.
What Grows in Polo
Every plant below cleared Polo's own zone 6a and its 208-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Polo?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 5 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Polo
Closest first, within ~10 miles of Polo. Listing isn't leaking, and distance isn't exposure.
- T55N R28W 27BBNitrate · 1100 ft
- KEEN OIL COUnderground Storage Tanks · 1400 ft
- CASEYS GENERAL STORE #2669Underground Storage Tanks · 1600 ft
- KENNY'S MFA SERVICEUnderground Storage Tanks · 1700 ft
- CASEYS GENERAL STORE #1298Underground Storage Tanks · 2000 ft
- CMC STEEL FABRICATORS, INCToxics Release Inventory · 0.8 mi
- RAY COUNTY CONS PWSD 2PFAS · 1.6 mi
- AT&TUnderground Storage Tanks · 1.7 mi
- EVERETT QUARRIES CO INC QUARRY #6Underground Storage Tanks · 4.9 mi
- KEVINS CUSTOM MOTORSBrownfields · 5.9 mi
- APCO STATIONUnderground Storage Tanks · 6.1 mi
- KNOXVILLE/RADIO REPORTER STATIONUnderground Storage Tanks · 6.2 mi
5 more sites are on the record inside the same radius. See them on the map
Measured from Polo'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 Polo.
Total Sites
22
within ~10 miles of Polo
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Polo
Severity Distribution
within ~10 miles of Polo
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •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.
Check your specific parcel in Polo
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 Polo average
Your land is one point inside Polo
Everything above resolves to Polo as a whole — one PHZM band and one 28°F frost record, read across 394 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 Polo Average
Polo Average
- ●USDA Zones 6a, averaged across Polo
- ●One soil character for all of Polo
- ●Frost dates read at Polo's scale: Apr 5 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Polo's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Polo
Pull a site-specific report for your exact address in Polo, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Polo averages can't show:
We read public map data around Polo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Polo average
How we know this about Polo
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 Polo’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 Polo
When does frost risk typically end in Polo?
The last hard freeze (28°F) in Polo typically lands around Apr 5, 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 26.
When is the first frost in Polo?
The first hard freeze (28°F) in Polo typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 208 days after the spring freeze cleared.
How long is the growing season in Polo?
Measured between 28°F hard freezes, Polo sees about 208 frost-free days — roughly Apr 5 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 26 to Oct 16, about 173 days.
Is the soil safe to grow vegetables in Polo?
The federal record around Polo shows 22 documented sites, mostly Nitrate entries (10), the nearest Nitrate record about 0.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Polo?
From about Sep 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 Oct 30 (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 Oct 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Polo's scale — its 6a band and its 208-day season. Your yard writes its own version of Polo'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 Polo’s own scale
6 of the readings below were taken at Polo's own scale — its own ~208-day season between 28°F freezes, the 394 acres it covers and 22 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Polo's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Polo's own 28°F hard-freeze dates, about Apr 5 and Oct 30 and the ~208-day span between themNOAA 1991–2020 Climate Normals
- 22 documented contamination sites on the federal record near Polo, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Polo's boundary and the 394 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~208-day seasonGrowable Ground crop-matching engine
- The ecoregion at Polo's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Polo's 394 acres read through its county's SSURGO summaryfrom Caldwell County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Caldwell 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 Caldwell County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Polo's 394 acreswhy one lot differs from the next →
- Which side of Polo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 394 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate 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 Polo-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriPolo sits outside our named growing regions, so Missouri as a whole is its closest context here.