Holt, Missouri, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Holt, 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 Holt 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 Holt — soil, climate, flood, and parcel records. How we handle your address.
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Holt — the short answer
Holt, Missouri: USDA zone 6a, about 210 days between hard freezes, across 332 acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- 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
- ~210
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 332 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 Holt's average, not your lot's — a low corner or a tree line moves it. Against Holt's 210-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Holt
Each reading below is measured for Holt itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHolt runs about 210 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
MeasuredHolt 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 Holt is in
Holt sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Holt's own centroid, and it is not what its county reads: Clay County is mostly Western Corn Belt Plains. The wider page above you is answering a different question about different ground.
What Grows in Holt
Every plant below cleared Holt's own zone 6a and its 210-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Holt?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (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. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Holt
Closest first, within ~10 miles of Holt. Listing isn't leaking, and distance isn't exposure.
- BUSY B STOREUnderground Storage Tanks · 600 ft
- SAMS QUICK STOP INCUnderground Storage Tanks · 750 ft
- HOLT COMMUNITY FIRE PROTECTION DISTUnderground Storage Tanks · 750 ft
- FRISTOES BODY SHOPBrownfields · 800 ft
- M&JS COME N GO LLCUnderground Storage Tanks · 0.9 mi
- CLAY COUNTY PWSD 3PFAS · 1.8 mi
- T53N R31W 22BBA1Nitrate · 4.5 mi
- T53N R31W 22DBB 11657Nitrate · 4.6 mi
- T53N R31W 23CBD1Nitrate · 4.7 mi
- MARSHALL EVERGREENS INCUnderground Storage Tanks · 4.7 mi
- MID AMERICAN PIPELINE COMPANY LLC KEARNEY STATIONBrownfields · 4.8 mi
- VERTEX PLASTICS INC KEARNEYBrownfields · 4.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Holt'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 Holt.
Total Sites
149
within ~10 miles of Holt
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Holt
Severity Distribution
within ~10 miles of Holt
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Holt, two things run higher than the national average within ~10 miles of Holt — PFAS (3 sites) and Nitrate (40 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Holt
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 Holt average
Your land is one point inside Holt
Everything above resolves to Holt as a whole — one PHZM band and one 28°F frost record, read across 332 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 Holt Average
Holt Average
- ●USDA Zones 6a, averaged across Holt
- ●One soil character for all of Holt
- ●Frost dates read at Holt's scale: Apr 3 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Holt's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Holt
Pull a site-specific report for your exact address in Holt, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Holt averages can't show:
We read public map data around Holt — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Holt average
How we know this about Holt
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 Holt’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 Holt
When does frost risk typically end in Holt?
The last hard freeze (28°F) in Holt typically lands around Apr 3, 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 24.
When is the first frost in Holt?
The first hard freeze (28°F) in Holt 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 210 days after the spring freeze cleared.
How long is the growing season in Holt?
Measured between 28°F hard freezes, Holt sees about 210 frost-free days — roughly Apr 3 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 16, about 175 days.
Is the soil safe to grow vegetables in Holt?
The federal record around Holt is a meaningful one — 149 documented sites, mostly Underground Storage Tanks entries (76), the nearest Underground Storage Tanks record about 0.1 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 Holt?
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 Holt's scale — its 6a band and its 210-day season. Your yard writes its own version of Holt'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 Holt’s own scale
6 of the readings below were taken at Holt's own scale — its own ~210-day season between 28°F freezes, the 332 acres it covers and 149 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Holt's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Holt's own 28°F hard-freeze dates, about Apr 3 and Oct 30 and the ~210-day span between themNOAA 1991–2020 Climate Normals
- 149 documented contamination sites on the federal record near Holt, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Holt's boundary and the 332 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~210-day seasonGrowable Ground crop-matching engine
- Holt sits in the Central Irregular Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Holt's 332 acres read through its county's SSURGO summaryfrom Clay County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Clay 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 Clay County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Holt's 332 acreswhy one lot differs from the next →
- Which side of Holt you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 332 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Holt-wide figureread your own land →
More in Missouri
Wider growing context
What grows across MissouriHolt sits outside our named growing regions, so Missouri as a whole is its closest context here.
Nearby growing guides