Alburnett, Iowa, sits in USDA hardiness zone 5a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Alburnett, 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 Alburnett 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 Alburnett — soil, climate, flood, and parcel records. How we handle your address.
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Alburnett — the short answer
Alburnett, Iowa: USDA zone 5a, about 185 days between hard freezes, across 484 acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~185
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 484 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 5a is Alburnett's average, not your lot's — a low corner or a tree line moves it. Against Alburnett's 185-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Alburnett
Each reading below is measured for Alburnett itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAlburnett runs about 185 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredAlburnett sits in USDA hardiness zone 5a.
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 Alburnett is in
Alburnett sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Alburnett's own centroid rather than borrowed from Linn County.
What Grows in Alburnett
Every plant below cleared Alburnett's own zone 5a and its 185-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Alburnett?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 19 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Alburnett
Closest first, within ~10 miles of Alburnett. Listing isn't leaking, and distance isn't exposure.
- ALBURNETT COMMUNITY SCHOOLUnderground Storage Tanks · 250 ft
- LEFTY''S CONVENIENCEUnderground Storage Tanks · 500 ft
- ALBURNETT GARAGEUnderground Storage Tanks · 550 ft
- DAVES SERVICEUnderground Storage Tanks · 600 ft
- IOWA RIVET TOOL CO INCUnderground Storage Tanks · 800 ft
- LINN-JONES FSUnderground Storage Tanks · 1100 ft
- 085N07W26AABB 16675 1964Alburnett 2Nitrate · 1500 ft
- 085N07W26AABB 13909 1961Alburnett 1Nitrate · 1500 ft
- MASTERS AUTOUnderground Storage Tanks · 2000 ft
- WINDFIELD FARMS INCUnderground Storage Tanks · 2.3 mi
- 084N07W11DDDBNitrate · 3.7 mi
- BLACKFORD FARMSUnderground Storage Tanks · 3.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Alburnett'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 Alburnett.
Total Sites
453
within ~10 miles of Alburnett
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Alburnett
Severity Distribution
within ~10 miles of Alburnett
Highest-Severity Sites
Know Before You Grow
- •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.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Alburnett
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 Alburnett average
Your land is one point inside Alburnett
Everything above resolves to Alburnett as a whole — one PHZM band and one 28°F frost record, read across 484 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 Alburnett Average
Alburnett Average
- ●USDA Zones 5a, averaged across Alburnett
- ●One soil character for all of Alburnett
- ●Frost dates read at Alburnett's scale: Apr 17 to Oct 19
YOUR Parcel
- ✓Your exact zone, not Alburnett's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Alburnett
Pull a site-specific report for your exact address in Alburnett, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Alburnett averages can't show:
We read public map data around Alburnett — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alburnett average
How we know this about Alburnett
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 Alburnett’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 Alburnett
When does frost risk typically end in Alburnett?
The last hard freeze (28°F) in Alburnett typically lands around Apr 17, 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 May 8.
When is the first frost in Alburnett?
The first hard freeze (28°F) in Alburnett typically arrives around Oct 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 5, so the watching starts about Sep 19 — about 185 days after the spring freeze cleared.
How long is the growing season in Alburnett?
Measured between 28°F hard freezes, Alburnett sees about 185 frost-free days — roughly Apr 17 through Oct 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 5, about 150 days.
Is the soil safe to grow vegetables in Alburnett?
The federal record around Alburnett is a meaningful one — 453 documented sites, mostly Underground Storage Tanks entries (210), the nearest Underground Storage Tanks record under a tenth of a mile 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 Alburnett?
From about Sep 19 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 19 (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 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Alburnett's scale — its 5a band and its 185-day season. Your yard writes its own version of Alburnett'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 Alburnett’s own scale
6 of the readings below were taken at Alburnett's own scale — its own ~185-day season between 28°F freezes, the 484 acres it covers and 453 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Alburnett's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Alburnett's own 28°F hard-freeze dates, about Apr 17 and Oct 19 and the ~185-day span between themNOAA 1991–2020 Climate Normals
- 453 documented contamination sites on the federal record near Alburnett, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Alburnett's boundary and the 484 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~185-day seasonGrowable Ground crop-matching engine
- The ecoregion at Alburnett'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 Alburnett's 484 acres read through its county's SSURGO summaryfrom Linn County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Linn County
- The growing challenges every Iowa grower plans around — written at state scale, so they stay on the state guidefrom Iowa
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Linn County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Alburnett's 484 acreswhy one lot differs from the next →
- Which side of Alburnett you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 484 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Alburnett-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaAlburnett sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides