Can I Grow Black Walnut in Nebraska?

Black Walnut in Nebraska — the short answer

Nebraska is not one climate

Where in Nebraska Fits Best

Even within Nebraska's zones 4b-6a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for black walnut (USDA PHZM 2023):

Zone Comparison

Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.

When to Plant Black Walnut in Nebraska

Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.

Growing Season Fit

The zone check says black walnut survives winter here. Whether the season is long enough — and warm enough — is a different question.

GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.

Soil + Drainage Fit

Black Walnut likes near-neutral soil (pH 5.8-8.3). That's the common-ground band across Nebraska's loess and sandy loam (sandhills) — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6.5 and 7.5 — worth knowing before you decide whether a Nebraska soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Nebraska site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.

Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Nebraska soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.

Before you plant black walnut for food

Anything you grow to eat takes up what is in the ground it grows in, so what is on record near you is worth knowing before black walnut goes in. What follows is Nebraska’s documented federal record at state scale — a screening signal, not a soil test, and not a statement about any one lot.

Safe to Grow Here?

What the federal record shows across Nebraska — and how to grow with it.

Federal record: High

We checked the federal record across Nebraska — 10,663 documented sites across 8 of the 9 source types we track.

The most significant on record: 162 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Nebraska carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.

See every recorded site across Nebraska on the mapKnow before you grow — the guide

Explore the live map

Nitrate4,328Brownfields2,675Underground Storage Tanks2,179CAFO700Toxics Release Inventory569

Sources Checked

across Nebraska

Nitrate Monitoring

4,328

Brownfields

2,675

Underground Storage Tanks

2,179

Concentrated Animal Feeding

700

Toxics Release Inventory

569

Superfund

162

PFAS Sampling

49

Mining Sites

1

Severity Distribution

across Nebraska

High67Moderate6,955Low3,641

Highest-Severity Sites

10TH Street Site

Superfund · Superfund NPL

Alliance, City of

PFAS Sampling · PFAS Detected

Alma Ne, City of

PFAS Sampling · PFAS Detected

Arlington, Village of

PFAS Sampling · PFAS Detected

Auburn, City of

PFAS Sampling · PFAS Detected

A note from Gnorman

What an experienced grower watches for around here

In and around Nebraska, two things run higher than the national average across Nebraska — CAFO (700 sites) and Nitrate (4,328 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).

grow under coverwork your in-ground beds wiselyread your soil before you plantbuild soil that holds onto nitrogenSee what's flagged near Nebraska

Explore the contamination map around Nebraska

Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.

What Else to Consider for Black Walnut in Nebraska

Zone compatibility tells you about winter cold survival — but Nebraska growers also need to think about:

What to actually do about these — and the constraints that apply to every Nebraska grower, not just black walnut — is covered on the Nebraska growing guide.

Timing shifts within Nebraska

Black Walnut needs about 150 days of frost-free season to complete its cycle. 92 of Nebraska’s 93 counties give it that outright. The tightest that does is Banner County at 157 frost-free days — 7 to spare. Below that line you are transplanting or extending the season, not direct-sowing.

Across Nebraska’s 93 counties the frost-free season runs from 134 days in Sioux County to 207 days in Sarpy County — a spread of 73 days, which is why a single statewide planting date misleads. The median Nebraska county sees 181 frost-free days, leaving black walnut about 31 days of slack on a typical parcel — room for a second sowing where the season runs long.

County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Black Walnut's 150-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.

Nebraska Cooperative Extension

For Nebraska-specific cultivar recommendations, planting calendars, and pest pressure for black walnut, the canonical source is Nebraska Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.

Is Black Walnut native to Nebraska?

Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Black Walnut as native to Nebraska. Planting it supports the pollinators and wildlife that evolved alongside it.

Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.

What pests threaten black walnut in Nebraska?

Japanese beetle is documented in Nebraska and will find black walnut, but it is manageable here. What an experienced grower watches for, and does:

Japanese beetle

Worth watching

The University of Kentucky lists this among the landscape plants Japanese beetles are most likely to attack, and the skeletonized, lace-like leaves can look alarming. But the honest calibration is the University of Minnesota's: a healthy, established tree, shrub or vine tolerates a lot of this feeding without significant, long-term injury — in most cases the damage is cosmetic and will not kill the plant.

What to do: For an established planting the move is to leave it be and keep it watered through the four-to-six-week flight — a vigorous plant outgrows feeding that looks worse than it is. Young or already-stressed plants are the exception and worth hand-protecting: knock beetles into soapy water in the cool of morning, when they are slow. The one thing not to hang is a Japanese beetle trap — University of Kentucky research found the lures pull in far more beetles than they catch.

Documented range: states listed as Japanese-beetle infested · University of Kentucky Entomology, University of Minnesota Extension, National Plant Board

The full japanese beetle playbook

Only pests whose documented range and host relationship both trace to a primary source appear here — so a quiet section means we have nothing sourced to tell you, not that your garden is pest-free.

Common Questions About Growing Black Walnut in Nebraska