Seward, Nebraska, sits in USDA hardiness zone 5b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Crops well matched to these conditions include cabbage, cranberry, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Seward, 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 Seward 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 Seward — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Seward — the short answer
Seward, Nebraska: USDA zone 5b, about 193 days between hard freezes, across 3K acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~193
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 Seward's average, not your lot's — a low corner or a tree line moves it. Against Seward's 193-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Seward
Each reading below is measured for Seward itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSeward runs about 193 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
MeasuredSeward 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 Seward is in
Seward sits in the Central Great Plains — EPA Level III, inside the wider Great Plains. That is read at Seward's own centroid rather than borrowed from Seward County.
What Grows in Seward
Every plant below cleared Seward's own zone 5b and its 193-day season. Each card opens that plant's Nebraska profile. How we score.
Is it too late to plant in Seward?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 20 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Seward
Closest first, within ~10 miles of Seward. Listing isn't leaking, and distance isn't exposure.
- FARMERS COOPERATIVE - SEWARDUnderground Storage Tanks · 550 ft
- GAS N SNACKSUnderground Storage Tanks · 650 ft
- FAST MART CONOCOUnderground Storage Tanks · 850 ft
- ROLFSMEIER MOTORS INCBrownfields · 850 ft
- GIT N SPLIT #48Underground Storage Tanks · 900 ft
- SEWARD POLICE DEPARTMENT FIRING RANGEBrownfields · 1300 ft
- HERPOLSHEIMER'S INCBrownfields · 1400 ft
- CONCORDIA UNIVERSITYBrownfields · 1900 ft
- GERHOLD CONCRETE CO.Toxics Release Inventory · 2000 ft
- SEWARD SCHOOL DISTRICTBrownfields · 0.5 mi
- SEWARD AIRPORTUnderground Storage Tanks · 0.5 mi
- NEBRASKA EQUIPMENTBrownfields · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Seward'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 Seward.
Total Sites
72
within ~10 miles of Seward
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Seward
Severity Distribution
within ~10 miles of Seward
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seward, two things run higher than the national average within ~10 miles of Seward — CAFO (5 sites) and Nitrate (24 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Seward
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 Seward average
Your land is one point inside Seward
Everything above resolves to Seward as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Seward Average
Seward Average
- ●USDA Zones 5b, averaged across Seward
- ●One soil character for all of Seward
- ●Frost dates read at Seward's scale: Apr 10 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Seward's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Seward
Pull a site-specific report for your exact address in Seward, Nebraska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seward averages can't show:
We read public map data around Seward — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seward average
How we know this about Seward
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 Seward’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 Seward
When does frost risk typically end in Seward?
The last hard freeze (28°F) in Seward typically lands around Apr 10, 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 1.
When is the first frost in Seward?
The first hard freeze (28°F) in Seward typically arrives around Oct 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 6, so the watching starts about Sep 20 — about 193 days after the spring freeze cleared.
How long is the growing season in Seward?
Measured between 28°F hard freezes, Seward sees about 193 frost-free days — roughly Apr 10 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 6, about 158 days.
Is the soil safe to grow vegetables in Seward?
The federal record around Seward is a meaningful one — 72 documented sites, mostly Nitrate entries (24), 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 Seward?
From about Sep 20 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Seward's scale — its 5b band and its 193-day season. Your yard writes its own version of Seward'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 Seward’s own scale
6 of the readings below were taken at Seward's own scale — its own ~193-day season between 28°F freezes, the 2,813 acres it covers and 72 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Seward's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Seward's own 28°F hard-freeze dates, about Apr 10 and Oct 20 and the ~193-day span between themNOAA 1991–2020 Climate Normals
- 72 documented contamination sites on the federal record near Seward, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Seward's boundary and the 2,813 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~193-day seasonGrowable Ground crop-matching engine
- The ecoregion at Seward's own centroid, the Central Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Seward's 2,813 acres read through its county's SSURGO summaryfrom Seward County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Seward County
- The growing challenges every Nebraska grower plans around — written at state scale, so they stay on the state guidefrom Nebraska
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Seward County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seward's 2,813 acreswhy one lot differs from the next →
- Which side of Seward you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,813 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 Seward-wide figureread your own land →
More in Nebraska
Wider growing context
What grows across NebraskaSeward sits outside our named growing regions, so Nebraska as a whole is its closest context here.
Nearby growing guides