Humboldt County, in Nevada, sits in USDA hardiness zone 6a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The conditions favor sagebrush, grape, tomato, and pinon pine, among others — though every individual site edits that list with its own soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Humboldt County holds more than one microclimate.
Soils and elevations shift across Humboldt County, so your frost dates and drainage aren't the county average. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Quick Facts
USDA Zones
6a
Last Hard Freeze (28°F)
Apr 14
County normal — light frosts run a few weeks later
First Hard Freeze (28°F)
Oct 21
County normal — light frosts arrive a few weeks earlier
County Area
6.2M acres
Hardiness Zone Range
Zone maps are averages across Humboldt County. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil in Humboldt County
Across Humboldt County, the ground is predominantly Aridisols, where Boton, Soughe, and Devada are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 7.2–8.5, slightly alkaline. Rainfall drains through hydrologic group D soils.
Soil order
Aridisols
Drainage
Well drained
Hydric soils
1%
Soil still varies lot by lot — soil types explained.
What Grows in Humboldt County
Plants matched to Humboldt County's USDA zones 6a — each links to its full growing profile.
Is it too late to plant in Humboldt County?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 21 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Growing Challenges in Nevada
What an experienced grower plans around here — each one has a move.
Extremely low rainfall (driest US state)
Every drop gets a job: drip irrigation, deep mulch, and basin planting make the driest state genuinely growable.
Alkaline soils (pH 8-9) limit many species
A soil test confirms your pH; from there, adapted species in the ground and acid-lovers in containers of amended mix.
Extreme summer heat in southern valleys
Southern valleys garden in the shoulder seasons — plant to fall-through-spring windows and shade what stays out in July.
For cultivar selection, pest pressure, and planting-time guidance specific to Nevada, the University of Nevada, Reno Extension is the authoritative local source.
Safe to Grow Here?
What the federal record shows across Humboldt County — and how to grow with it.
We checked the federal record across Humboldt County — 901 documented sites across 7 of the 9 source types we track.
The most significant on record: 9 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Humboldt County 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.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Sources Checked
across Humboldt County
Severity Distribution
across Humboldt County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Humboldt County, Mining runs higher than the national average — 541 sites nearby. That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Humboldt County
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Your Specific Parcel Matters
Humboldt County Average
- ●USDA Zones 6a
- ●Generic soil type for the area
- ●State-average frost dates
YOUR Parcel
- ✓Your exact hardiness zone
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Humboldt County
Pull a site-specific report for your exact address in Humboldt County, Nevada — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Key Growing Facts for Humboldt County, Nevada
- USDA Hardiness Zones: 6a (USDA PHZM 2023)
- Last Hard Freeze (28°F): Apr 14 (county normal, NOAA 1991–2020 Climate Normals — light frosts can follow for a few weeks)
- First Hard Freeze (28°F): Oct 21 (county normal, NOAA 1991–2020 Climate Normals — light frosts can arrive a few weeks earlier)
- Days Between Hard Freezes: ~190 (county normal, NOAA 1991–2020 Climate Normals)
- County Land Area: 6.2M acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. County boundaries: US Census TIGER/Line 2025.
Frost dates here are the Humboldt County average. Low spots and tree cover move them by days on any one yard — see your exact frost windows.
Frequently Asked Questions
What hardiness zone is Humboldt County, Nevada?
Humboldt County sits in USDA hardiness zone 6a, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
Is it too late to plant in Humboldt County?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 21 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
When does frost risk typically end in Humboldt County?
The last hard freeze (28°F) in Humboldt County typically lands around Apr 14, per NOAA 1991–2020 climate normals — an earlier marker than the light-frost dates many planting charts quote. That marks the hard freeze, not the last light frost — light frosts can still bite for a few more weeks, so tender transplants usually wait another 2–3 weeks.
How long is the growing season in Humboldt County?
Measured between 28°F hard freezes, Humboldt County sees about 190 frost-free days — roughly Apr 14 through Oct 21, per NOAA 1991–2020 climate normals. Tender crops get a somewhat shorter practical window, since lighter frosts reach a few weeks past the hard-freeze dates on both ends.
What vegetables grow in Humboldt County?
Humboldt County's zone 6a supports a wide range — strong performers include Sagebrush, Grape, Tomato, and Pinon Pine. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Which hardiness zone is Humboldt County, really?
Officially, Humboldt County sits in USDA zone 6a (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
Is the soil safe to grow vegetables in Humboldt County?
The federal record around Humboldt County runs heavier than most — 901 documented sites — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
Just moved to Humboldt County — what should I know before planting?
Start with three facts. Humboldt County sits in USDA zone 6a, which sets what survives winter; the last 28°F hard freeze typically clears around Apr 14, with about 190 frost-free days to work with (NOAA 1991–2020 climate normals); and 901 documented sites sit on the federal record here, so a soil test before food beds is the smart first step. From there, matching plants to your actual soil and sun is the fun part.
Everything on this page is a Humboldt County average. Your yard writes its own version — we read soil, sun, drainage, and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Nevada's frost window, season length, and soil profile against the plant's real requirements.