Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 89404 — Denio, NV

ZIP code 89404 (Denio, Humboldt County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 30 and the first fall frost September 18.

Where ZIP 89404 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone6b−5 to 0 °F

Coldest night−20.6 to −17.8 °C

Last frostMay 30

First frostSep 18

2012 zone6b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Denio, NV…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Denio, NV

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 30median — 50% chance of a later frost

Safe for tender plantsJune 15only 10% chance of frost after

First fall frostSeptember 18median — 10% chance by Sep 5

Growing season111 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 11 and returns around October 1.

From the NOAA station Denio, NV — 16 miles away, elevation 4,190 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 89404

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 18 – May 2

SpinachSow outdoors · Apr 18 – May 9

Broccoli, cabbageStart indoors · Mar 21 – Apr 4

Broccoli, cabbageTransplant · May 9 – May 23

Onion setsPlant outdoors · May 2 – May 16

PotatoesPlant outdoors · May 9 – May 23

LettuceSow outdoors · May 2 – May 16

Carrots, beetsSow outdoors · May 9 – May 23

TomatoesStart indoors · Apr 4 – Apr 18

TomatoesTransplant · Jun 6 – Jun 20

Peppers, eggplantStart indoors · Mar 21 – Apr 4

Peppers, eggplantTransplant · Jun 13 – Jun 27

BeansSow outdoors · Jun 6 – Jun 20

Sweet cornSow outdoors · Jun 6 – Jun 20

Cucumbers, squashSow outdoors · Jun 6 – Jun 20

Fall lettuce, spinachSow outdoors · Jul 24 – Aug 7

GarlicPlant cloves · Sep 4 – Oct 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 30) and first fall frost (Sep 18) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 89404 came on Mar 14 — 21 days earlier than the 1991–2020 average (Apr 4).

average
Apr 42026
Mar 14

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 6b in Nevada

508 plants native to the lower 48 states, recorded in Nevada, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Denio, NV.

Soil in Denio, NV

The soil mapped at the center of ZIP 89404 is Bucklake — very cobbly loam, well drained.

TextureVery cobbly loama good balance for most vegetables

pH6.7neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Bucklake very cobbly loam, 8 to 50 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 89404; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Denio, NV

Summer high94 °Faverage high, July

Winter low22 °Faverage low, January

Hot days54days a year at 90 °F or more

Freezing nights152nights a year at 32 °F or less

Growing degree days2,702base 50 °F — the season’s usable heat

Longest day15 h 13 mindaylight on June 21

Shortest day9 h 08 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation6.2 inper year, rain and melted snow

Snowfall14 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Denio, NV (16 mi away); precipitation: Dufurrena - Denio 22wsw, NV (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

3 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

977106b

Fields, OR · 27 mi

894217a

Mc Dermitt, NV · 50 mi

977216b

Princeton, OR · 52 mi

894256a

Orovada, NV · 53 mi

977366b

Frenchglen, OR · 58 mi

Winnemucca, NV · 67 mi

Nevada planting zones →

Questions about 89404

What planting zone is ZIP code 89404?

ZIP code 89404 (Denio, NV) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Denio, NV?

The median last spring frost (32 °F) near 89404 is May 30; after June 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Denio station.

When is the first frost in Denio, NV?

The median first fall frost near 89404 is September 18, giving a median frost-free growing season of 111 days.

When should I plant tomatoes in 89404?

Start tomato seeds indoors around Apr 4 – Apr 18 and set transplants outside around Jun 6 – Jun 20, one to three weeks after the median last frost.

How much rain and snow does 89404 get?

About 6.2 inches of precipitation a year and 14 inches of snowfall (NOAA 1991–2020 normals, Dufurrena - Denio 22wsw station).

How hot do summers get in Denio, NV?

The average high peaks at 94 °F in July, with about 54 days a year at 90 °F or more.

What kind of soil does 89404 have?

The USDA soil survey maps Bucklake at the center of ZIP 89404: very cobbly loam, well drained, pH about 6.7 (neutral).

Did spring come early in Denio, NV in 2026?

Spring leaf-out near 89404 came on Mar 14 in 2026, 21 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Denio, NV?

Long-day onions: the longest day near 89404 is 15 h 13 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).