Thayer, Kansas, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Thayer, 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 Thayer 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 Thayer — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Thayer — the short answer
Thayer, Kansas: USDA zone 7a, about 222 days between hard freezes, across 349 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~222
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 349 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 Thayer's average, not your lot's — a low corner or a tree line moves it. Against Thayer's 222-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Thayer
Each reading below is measured for Thayer itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredThayer runs about 222 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
MeasuredThayer 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 Thayer is in
Thayer sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Thayer's own centroid rather than borrowed from Neosho County.
What Grows in Thayer
Every plant below cleared Thayer's own zone 7a and its 222-day season. Each card opens that plant's Kansas profile. How we score.
Is it too late to plant in Thayer?
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 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 6 — 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 Thayer
Closest first, within ~10 miles of Thayer. Listing isn't leaking, and distance isn't exposure.
- CARLS SALES & SERV INCUnderground Storage Tanks · 1400 ft
- PRIME TIME STORE #7Underground Storage Tanks · 2500 ft
- 29S 18E 20AC 01Nitrate · 1.8 mi
- 30S 17E 02DD 01Nitrate · 2.6 mi
- 30S 17E 02DDD 01Nitrate · 2.6 mi
- CENTERVILLE ROAD HOUSE %ADAMSUnderground Storage Tanks · 3.0 mi
- GOMERS FIBERGLASSBrownfields · 3.0 mi
- COLLINS AUTO SALVAGEBrownfields · 3.0 mi
- 30S 18E 20AB 01Nitrate · 4.5 mi
- 29S 19E 30BB 01Nitrate · 5.7 mi
- 30S 17E 17BBA 01Nitrate · 6.3 mi
- RUSKIN CO. - GALESBURGToxics Release Inventory · 6.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Thayer'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 Thayer.
Total Sites
40
within ~10 miles of Thayer
Risk Level
Low
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Thayer
Severity Distribution
within ~10 miles of Thayer
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Thayer, two things run higher than the national average within ~10 miles of Thayer — Nitrate (28 sites) and Toxics Release Inventory (3 sites). That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Thayer
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 Thayer average
Your land is one point inside Thayer
Everything above resolves to Thayer as a whole — one PHZM band and one 28°F frost record, read across 349 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 Thayer Average
Thayer Average
- ●USDA Zones 7a, averaged across Thayer
- ●One soil character for all of Thayer
- ●Frost dates read at Thayer's scale: Mar 29 to Nov 6
YOUR Parcel
- ✓Your exact zone, not Thayer's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Thayer
Pull a site-specific report for your exact address in Thayer, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Thayer averages can't show:
We read public map data around Thayer — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Thayer average
How we know this about Thayer
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 Thayer’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 Thayer
When does frost risk typically end in Thayer?
The last hard freeze (28°F) in Thayer typically lands around Mar 29, 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 19.
When is the first frost in Thayer?
The first hard freeze (28°F) in Thayer typically arrives around Nov 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 23, so the watching starts about Oct 7 — about 222 days after the spring freeze cleared.
How long is the growing season in Thayer?
Measured between 28°F hard freezes, Thayer sees about 222 frost-free days — roughly Mar 29 through Nov 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 23, about 187 days.
Is the soil safe to grow vegetables in Thayer?
The federal record around Thayer is light — 40 documented sites across the 9 federal source types we checked, mostly Nitrate entries (28), 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 Thayer?
From about Oct 7 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Thayer's scale — its 7a band and its 222-day season. Your yard writes its own version of Thayer'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 Thayer’s own scale
6 of the readings below were taken at Thayer's own scale — its own ~222-day season between 28°F freezes, the 349 acres it covers and 40 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Thayer's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Thayer's own 28°F hard-freeze dates, about Mar 29 and Nov 6 and the ~222-day span between themNOAA 1991–2020 Climate Normals
- 40 documented contamination sites on the federal record near Thayer, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Thayer's boundary and the 349 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~222-day seasonGrowable Ground crop-matching engine
- The ecoregion at Thayer's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Thayer's 349 acres read through its county's SSURGO summaryfrom Neosho County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Neosho County
- The growing challenges every Kansas grower plans around — written at state scale, so they stay on the state guidefrom Kansas
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Neosho County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Thayer's 349 acreswhy one lot differs from the next →
- Which side of Thayer you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 349 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 Thayer-wide figureread your own land →