The Platte River Valley spans USDA hardiness zones 5b-6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
The Platte River Valley isn't the Nebraska average — it's the warm, irrigable floor of the Big Bend. Scoped to the eight counties the Platte's main stem crosses from the confluence at North Platte east through Grand Island, this valley runs a median 187 frost-free days, roughly a week longer than the state's dry uplands and Sandhills, on a predominantly zone-5b floor that tips to 6a from Grand Island eastward. What actually sets it apart is water: deep alluvial silt loams laid down by the river, sitting over a shallow high-water-table aquifer atop the Ogallala, make this Nebraska's center-pivot heartland — where irrigated corn, soybeans, and seed corn thrive on the same floodplain that stages hundreds of thousands of sandhill cranes each spring. If you're growing here, you're not on the tableland; you're on the river's own ground, with the season length and irrigation reliability that come with it. Crops well matched to these conditions include sweet corn, tomato, sunflower, and grape — though what thrives on any one site still turns on its specific soil, sun, and drainage.
The Platte River Valley spans Nebraska.
Your yard isn't all of the Platte River Valley.
The Platte River Valley spans USDA zones 5b-6a, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Platte River Valley — soil, climate, flood, and parcel records. How we handle your address.
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The Platte River Valley — the short answer
The Platte River Valley: USDA zones 5b-6a, 178–196 frost-free days, in Nebraska.
- USDA zones
- 5b-6a
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 178–196 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 8
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the Platte River Valley
Plants matched to the Platte River Valley's USDA zones 5b-6a, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the Platte River Valley
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Platte River Valley’s USDA zones 5b-6a — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the Platte River Valley
The USDA soil survey maps this ground county by county. These are those records weighted by land area across eight member counties — this region’s own profile, not a state figure.
The ground is predominantly Mollisols, at 55% of mapped acres, followed by Entisols (43%) and Alfisols (1%). Five soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Valentine, Coly, and Holdrege.
56% of those acres are well drained, and another 22% excessively drained, 9% somewhat poorly drained. Topsoil pH runs 5.8–7.5 between the lowest and the highest county on record. 39% of the footprint is classed prime farmland.
Soil order
Mollisols
Drainage
Well drained
Topsoil pH
5.8–7.5
Hydric soils
4%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Merrick County holds the most wetland ground here, at 7% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Platte River Valley
The soil survey reads this ground county by county, and the readings above are those records summed across the Platte River Valley. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records56% of the mapped acres across the Platte River Valley are well drained — ground that drains quickly. That is area-weighted across all eight of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the Platte River Valley runs pH 5.8–7.5 — near neutral in seven of its eight counties.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across the Platte River Valley — and how to grow with it.
Across the Platte River Valley's 8 counties the federal record holds 1,632 documented sites, mostly Nitrate (704), Brownfields (359) and Underground Storage Tanks (326). The heaviest single county is Hall County, with 461.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the Platte River Valley to see which records sit where you actually grow.
Sources Checked
Summed across the 8 counties in the Platte River Valley
A note from Gnorman
What an experienced grower watches for around here
In and around the Platte River Valley, two things run higher than the national average across the 8 counties in the Platte River Valley — CAFO (124 sites) and Nitrate (704 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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).
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Platte River Valley
Everything above resolves to the Platte River Valley as a whole — a footprint spanning USDA zones 5b-6a. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the Platte River Valley Average
Platte River Valley Average
- ●USDA Zones 5b-6a, averaged across Platte River Valley
- ●One soil character for all of Platte River Valley
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Platte River Valley's 5b-6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Platte River Valley
Pull a site-specific report for your exact address in the Platte River Valley — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Platte River Valley averages can't show:
We read public map data around The Platte River Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Platte River Valley average
How we know this about the Platte River Valley
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the Platte River Valley
What hardiness zone is the Platte River Valley?
The Platte River Valley spans USDA hardiness zones 5b-6a, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the Platte River Valley?
Measured between 28°F hard freezes, the Platte River Valley's counties mostly run 183 to 194 frost-free days, median 188 (NOAA Regional Climate Centers ACIS, 1991–2020, over 8 member counties). That 11-day spread is the honest read — no single season describes 8 counties, and each county guide below carries its own.
When does frost risk end in the Platte River Valley?
Across the Platte River Valley, the middle half of member counties see their last 28°F hard freeze between Apr 12 and Apr 19 (median Apr 16), and their first fall freeze between Oct 19 and Oct 22. Those are hard freezes, not the last light frost: tender transplants wait for about May 7, and elevation decides which end of a 7-day spread you garden in.
What grows well in the Platte River Valley?
The Platte River Valley's conditions suit plants such as Sweet Corn, Tomato, Sunflower, Grape, Cottonwood. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the Platte River Valley defined?
The Platte River Valley is defined here as a curated cluster of 8 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the Platte River Valley cover?
The Platte River Valley spans Nebraska. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
High Plains, Nebraska Sandhills, Nebraska Panhandle, and Southeast Nebraska / Omaha-Lincoln Loess Corridor share at least one state with the Platte River Valley. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the Platte River Valley’s own scale
6 of the readings below were taken at the Platte River Valley's own scale — the zone 5b-6a band across its footprint, a median 188-day season across its 8 counties and 1,632 documented federal contamination records across its 8 counties, 461 of them in Hall County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 5b-6a aggregated across all 8 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 8 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 8 counties run 183 to 194 frost-free days, median 188NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 1,632 documented federal contamination records across its 8 counties, 461 of them in Hall County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 55% Mollisols, topsoil pH 5.8–7.5, area-weighted across its 8 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 5b-6afrom Nebraska
What this page can’t tell you
- Which end of the 11-day range your ground sits at — 183 days at one extreme, 194 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the Platte River Valley
State growing guides
Counties in this region
Other growing regions across Nebraska
A semi-arid shortgrass tableland of deep soils and big sky, where wind, low rainfall, and irrigation shape dryland wheat, sorghum, and resilient gardens.
The largest sand-dune field in the Western Hemisphere, stabilized under prairie grass — grazing country where gardening means windbreaks and sandy-soil care.
Nebraska's coldest, shortest, driest corner — the high semi-arid tableland west of the Sandhills, where the growing answer flips from the state's humid corn-and-soy story. Sioux County is the only zone 4b county in Nebraska, with roughly 134 frost-free days; the rest of the panhandle runs zone 5b (5a across the northern tier) at about 4,000–5,400 ft elevation and only ~15–18 inches of rain a year. This is North Platte Valley irrigated country — sugar beets, dry edible beans (Nebraska is a leading U.S. producer, concentrated here), plus dryland winter wheat, sunflowers and sorghum on the wind-swept plains — a fundamentally different planting playbook from the rain-fed eastern half of the state.
Nebraska's warmest, longest-season corner. The loess-bluff counties tracking the Missouri River from Omaha and Lincoln south to the Kansas line sit in solid Zone 6a, with a 192–207-day frost-free season — roughly three weeks longer than the statewide median of 181 days and about ten weeks longer than the Panhandle (134). This is true humid Corn Belt, not the dry western uplands: deep, well-drained Peoria loess and ~28–34 inches of annual rain mean the growing question here isn't whether things will make it, but managing the disease and humidity pressure that a longer, wetter summer brings — a materially different and warmer answer than Nebraska's statewide average.