Tarkio, Missouri, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Tarkio, 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 Tarkio 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 Tarkio — soil, climate, flood, and parcel records. How we handle your address.
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Tarkio — the short answer
Tarkio, Missouri: USDA zone 5b, about 204 days between hard freezes, across 888 acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~204
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 888 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 5b is Tarkio's average, not your lot's — a low corner or a tree line moves it. Against Tarkio's 204-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Tarkio
Each reading below is measured for Tarkio itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTarkio runs about 204 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
MeasuredTarkio sits in USDA hardiness zone 5b.
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 Tarkio is in
Tarkio sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Tarkio's own centroid rather than borrowed from Atchison County.
What Grows in Tarkio
Every plant below cleared Tarkio's own zone 5b and its 204-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Tarkio?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 27 — 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 Tarkio
Closest first, within ~10 miles of Tarkio. Listing isn't leaking, and distance isn't exposure.
- BENNETTS BODY SHOPBrownfields · 1600 ft
- BAER & SONS, INCUnderground Storage Tanks · 1700 ft
- HOWELL REPAIRUnderground Storage Tanks · 2000 ft
- RILEY'S SERVICEUnderground Storage Tanks · 2000 ft
- CASEYS GENERAL STORE #0041Underground Storage Tanks · 2100 ft
- DAVE'S SERVICEUnderground Storage Tanks · 0.7 mi
- TORREY PINES LLCUnderground Storage Tanks · 0.7 mi
- T65N R40W 14DDNitrate · 0.8 mi
- T65N R40W 14DDD1Nitrate · 0.9 mi
- T65N R40W 13CCC1Nitrate · 0.9 mi
- T65N R40W 12CCD1Nitrate · 1.0 mi
- TARKIO MUNICIPAL AIRPORTUnderground Storage Tanks · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Tarkio'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 Tarkio.
Total Sites
50
within ~10 miles of Tarkio
Risk Level
Moderate
Highest-severity
3 concentrated animal feeding operations
Sources Checked
within ~10 miles of Tarkio
Severity Distribution
within ~10 miles of Tarkio
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Tarkio, two things run higher than the national average within ~10 miles of Tarkio — CAFO (3 sites) and Nitrate (16 sites). That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Tarkio
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 Tarkio average
Your land is one point inside Tarkio
Everything above resolves to Tarkio as a whole — one PHZM band and one 28°F frost record, read across 888 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 Tarkio Average
Tarkio Average
- ●USDA Zones 5b, averaged across Tarkio
- ●One soil character for all of Tarkio
- ●Frost dates read at Tarkio's scale: Apr 6 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Tarkio's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Tarkio
Pull a site-specific report for your exact address in Tarkio, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Tarkio averages can't show:
We read public map data around Tarkio — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Tarkio average
How we know this about Tarkio
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 Tarkio’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 Tarkio
When does frost risk typically end in Tarkio?
The last hard freeze (28°F) in Tarkio typically lands around Apr 6, 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 27.
When is the first frost in Tarkio?
The first hard freeze (28°F) in Tarkio typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 204 days after the spring freeze cleared.
How long is the growing season in Tarkio?
Measured between 28°F hard freezes, Tarkio sees about 204 frost-free days — roughly Apr 6 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 27 to Oct 13, about 169 days.
Is the soil safe to grow vegetables in Tarkio?
The federal record around Tarkio shows 50 documented sites, mostly Underground Storage Tanks entries (28), the nearest Brownfields record about 0.3 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 Tarkio?
From about Sep 27 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Tarkio's scale — its 5b band and its 204-day season. Your yard writes its own version of Tarkio'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 Tarkio’s own scale
6 of the readings below were taken at Tarkio's own scale — its own ~204-day season between 28°F freezes, the 888 acres it covers and 50 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Tarkio's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Tarkio's own 28°F hard-freeze dates, about Apr 6 and Oct 27 and the ~204-day span between themNOAA 1991–2020 Climate Normals
- 50 documented contamination sites on the federal record near Tarkio, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Tarkio's boundary and the 888 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~204-day seasonGrowable Ground crop-matching engine
- The ecoregion at Tarkio's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Tarkio's 888 acres read through its county's SSURGO summaryfrom Atchison County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Atchison 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 Atchison County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Tarkio's 888 acreswhy one lot differs from the next →
- Which side of Tarkio you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 888 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Tarkio-wide figureread your own land →