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

Planting zone for 98811 — Ardenvoir, WA

ZIP code 98811 (Ardenvoir, Chelan County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 5 and the first fall frost October 24.

Where ZIP 98811 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 5

First frostOct 24

2012 zone6b

Was 6b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Ardenvoir, WA…

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 Ardenvoir, WA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 5median — 50% chance of a later frost

Safe for tender plantsMay 2only 10% chance of frost after

First fall frostOctober 24median — 10% chance by Sep 29

Growing season200 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 13 and returns around November 7.

From the NOAA station Entiat Fish Hatchery, WA — 4 miles away, elevation 1,027 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 98811

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 22 – Mar 8

SpinachSow outdoors · Feb 22 – Mar 15

Broccoli, cabbageStart indoors · Jan 25 – Feb 8

Broccoli, cabbageTransplant · Mar 15 – Mar 29

Onion setsPlant outdoors · Mar 8 – Mar 22

PotatoesPlant outdoors · Mar 15 – Mar 29

LettuceSow outdoors · Mar 8 – Mar 22

Carrots, beetsSow outdoors · Mar 15 – Mar 29

TomatoesStart indoors · Feb 8 – Feb 22

TomatoesTransplant · Apr 12 – Apr 26

Peppers, eggplantStart indoors · Jan 25 – Feb 8

Peppers, eggplantTransplant · Apr 19 – May 3

BeansSow outdoors · Apr 12 – Apr 26

Sweet cornSow outdoors · Apr 12 – Apr 26

Cucumbers, squashSow outdoors · Apr 12 – Apr 26

Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12

GarlicPlant cloves · Oct 10 – Nov 14

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 5) and first fall frost (Oct 24) 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 98811 came on Mar 30 — 6 days earlier than the 1991–2020 average (Apr 5).

average
Apr 52026
Mar 30

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 7a in Washington

590 plants native to the lower 48 states, recorded in Washington, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Ardenvoir, WA.

Soil in Ardenvoir, WA

The soil mapped at the center of ZIP 98811 is Tyee — gravelly ashy loamy coarse sand, well drained.

TextureGravelly ashy loamy coarse sanddrains and warms fast; dries out and needs more feeding

pH7.0neutral; 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: Tyee gravelly loamy coarse sand, 30 to 90 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 98811; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ardenvoir, WA

Summer high88 °Faverage high, July

Winter low25 °Faverage low, January

Hot days35days a year at 90 °F or more

Freezing nights134nights a year at 32 °F or less

Growing degree days2,800base 50 °F — the season’s usable heat

Longest day16 h 00 mindaylight on June 21

Shortest day8 h 24 mindaylight on December 21

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

Precipitation13.6 inper year, rain and melted snow

Snowfall40 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Entiat Fish Hatchery, WA (4 mi away); precipitation: Entiat Fish Hatchery, WA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

East Wenatchee, WA · 19 mi

988227a

Entiat, WA · 20 mi

988017a

Wenatchee, WA · 21 mi

Washington planting zones →

Questions about 98811

What planting zone is ZIP code 98811?

ZIP code 98811 (Ardenvoir, WA) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Ardenvoir, WA?

The median last spring frost (32 °F) near 98811 is April 5; after May 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Entiat Fish Hatchery station.

When is the first frost in Ardenvoir, WA?

The median first fall frost near 98811 is October 24, giving a median frost-free growing season of 200 days.

When should I plant tomatoes in 98811?

Start tomato seeds indoors around Feb 8 – Feb 22 and set transplants outside around Apr 12 – Apr 26, one to three weeks after the median last frost.

How much rain and snow does 98811 get?

About 13.6 inches of precipitation a year and 40 inches of snowfall (NOAA 1991–2020 normals, Entiat Fish Hatchery station).

How hot do summers get in Ardenvoir, WA?

The average high peaks at 88 °F in July, with about 35 days a year at 90 °F or more.

What kind of soil does 98811 have?

The USDA soil survey maps Tyee at the center of ZIP 98811: gravelly ashy loamy coarse sand, well drained, pH about 7.0 (neutral).

Did spring come early in Ardenvoir, WA in 2026?

Spring leaf-out near 98811 came on Mar 30 in 2026, 6 days earlier than the 1991–2020 average (Apr 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ardenvoir, WA?

Long-day onions: the longest day near 98811 is 16 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 98811 change?

Yes. The 2012 USDA map put 98811 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.