Savonburg, Kansas, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, hazelnut, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Savonburg, 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 Savonburg 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 Savonburg — soil, climate, flood, and parcel records. How we handle your address.
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Savonburg — the short answer
Savonburg, Kansas: USDA zone 6b, about 224 days between hard freezes, across 123 acres of city.
- USDA zone
- 6b
- 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 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~224
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 123 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 6b is Savonburg's average, not your lot's — a low corner or a tree line moves it. Against Savonburg's 224-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Savonburg
Each reading below is measured for Savonburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSavonburg runs about 224 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
MeasuredSavonburg sits in USDA hardiness zone 6b.
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 Savonburg is in
Savonburg sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Savonburg's own centroid rather than borrowed from Allen County.
What Grows in Savonburg
Every plant below cleared Savonburg's own zone 6b and its 224-day season. Each card opens that plant's Kansas profile. How we score.
Is it too late to plant in Savonburg?
Almost never — the real question is what to plant next. 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 8 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Savonburg
Closest first, within ~10 miles of Savonburg. Listing isn't leaking, and distance isn't exposure.
- 26S 21E 28AAA 01Nitrate · 2.0 mi
- 27S 21E 08CC 01Nitrate · 3.0 mi
- 26S 20E 13BBA 01Nitrate · 3.4 mi
- 26S 21E 15ABA 01Nitrate · 3.8 mi
- 26S 20E 01BAB 01Nitrate · 5.2 mi
- 26S 20E 17AAA 01Nitrate · 5.9 mi
- 25S 20E 25BAA 01Nitrate · 7.0 mi
- 28S 21E 05BB 01Nitrate · 7.2 mi
- 28S 21E 05B 01Nitrate · 7.4 mi
- 26S 19E 36CDD 01Nitrate · 7.6 mi
- 26S 22E 28DDD 01Nitrate · 7.8 mi
- 26S 19E 01ABB 01Nitrate · 8.9 mi
2 more sites are on the record inside the same radius. See them on the map
Measured from Savonburg'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 Savonburg.
Severity Distribution
within ~10 miles of Savonburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Savonburg, Nitrate runs higher than the national average — 28 sites within ~10 miles of Savonburg. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Savonburg
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 Savonburg average
Your land is one point inside Savonburg
Everything above resolves to Savonburg as a whole — one PHZM band and one 28°F frost record, read across 123 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 Savonburg Average
Savonburg Average
- ●USDA Zones 6b, averaged across Savonburg
- ●One soil character for all of Savonburg
- ●Frost dates read at Savonburg's scale: Mar 29 to Nov 8
YOUR Parcel
- ✓Your exact zone, not Savonburg's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Savonburg
Pull a site-specific report for your exact address in Savonburg, Kansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Savonburg averages can't show:
We read public map data around Savonburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Savonburg average
How we know this about Savonburg
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 Savonburg’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 Savonburg
When does frost risk typically end in Savonburg?
The last hard freeze (28°F) in Savonburg 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 Savonburg?
The first hard freeze (28°F) in Savonburg typically arrives around Nov 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 25, so the watching starts about Oct 9 — about 224 days after the spring freeze cleared.
How long is the growing season in Savonburg?
Measured between 28°F hard freezes, Savonburg sees about 224 frost-free days — roughly Mar 29 through Nov 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 25, about 189 days.
Is the soil safe to grow vegetables in Savonburg?
The federal record around Savonburg is light — 28 documented sites across the 9 federal source types we checked, mostly Nitrate entries (28), the nearest Nitrate record about 2.0 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 Savonburg?
From about Oct 9 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Savonburg's scale — its 6b band and its 224-day season. Your yard writes its own version of Savonburg'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 Savonburg’s own scale
6 of the readings below were taken at Savonburg's own scale — its own ~224-day season between 28°F freezes, the 123 acres it covers and 28 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Savonburg's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Savonburg's own 28°F hard-freeze dates, about Mar 29 and Nov 8 and the ~224-day span between themNOAA 1991–2020 Climate Normals
- 28 documented contamination sites on the federal record near Savonburg, the closest Nitrate record about 2.0 miles out from the town centreFederal environmental registers
- Savonburg's boundary and the 123 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~224-day seasonGrowable Ground crop-matching engine
- The ecoregion at Savonburg's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Savonburg's 123 acres read through its county's SSURGO summaryfrom Allen County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Allen 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 Allen County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Savonburg's 123 acreswhy one lot differs from the next →
- Which side of Savonburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 123 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 2.0 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 Savonburg-wide figureread your own land →
More in Kansas
Wider growing context
What grows across KansasSavonburg sits outside our named growing regions, so Kansas as a whole is its closest context here.