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

Planting zone for 99322 — Bickleton, WA

ZIP code 99322 (Bickleton, Klickitat County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is May 16 and the first fall frost October 9.

Where ZIP 99322 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostMay 16

First frostOct 9

2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Bickleton, 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 Bickleton, WA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 16median — 50% chance of a later frost

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

First fall frostOctober 9median — 10% chance by Sep 26

Growing season144 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 27 and returns around October 22.

From the NOAA station Bickleton, WA — 8 miles away, elevation 3,015 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 99322

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 4 – Apr 18

SpinachSow outdoors · Apr 4 – Apr 25

Broccoli, cabbageStart indoors · Mar 7 – Mar 21

Broccoli, cabbageTransplant · Apr 25 – May 9

Onion setsPlant outdoors · Apr 18 – May 2

PotatoesPlant outdoors · Apr 25 – May 9

LettuceSow outdoors · Apr 18 – May 2

Carrots, beetsSow outdoors · Apr 25 – May 9

TomatoesStart indoors · Mar 21 – Apr 4

TomatoesTransplant · May 23 – Jun 6

Peppers, eggplantStart indoors · Mar 7 – Mar 21

Peppers, eggplantTransplant · May 30 – Jun 13

BeansSow outdoors · May 23 – Jun 6

Sweet cornSow outdoors · May 23 – Jun 6

Cucumbers, squashSow outdoors · May 23 – Jun 6

Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28

GarlicPlant cloves · Sep 25 – Oct 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 16) and first fall frost (Oct 9) 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 99322 came on Mar 21 — 10 days earlier than the 1991–2020 average (Mar 31).

average
Mar 312026
Mar 21

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 7b in Washington

592 plants native to the lower 48 states, recorded in Washington, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Bickleton, WA.

Soil in Bickleton, WA

The soil mapped at the center of ZIP 99322 is Mikkalo — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH7.2neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Mikkalo-Bakeoven complex, 2 to 15 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 99322; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bickleton, WA

Summer high81 °Faverage high, July

Winter low23 °Faverage low, December

Hot days14days a year at 90 °F or more

Freezing nights144nights a year at 32 °F or less

Growing degree days1,788base 50 °F — the season’s usable heat

Longest day15 h 45 mindaylight on June 21

Shortest day8 h 39 mindaylight on December 21

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

Precipitation15 inper year, rain and melted snow

Snowfall31 inper year; 37 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bickleton, WA (8 mi away); precipitation: Bickleton, WA (8 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.

993567a

Roosevelt, WA · 13 mi

Toppenish, WA · 23 mi

Grandview, WA · 26 mi

978127b

Arlington, OR · 26 mi

Washington planting zones →

Questions about 99322

What planting zone is ZIP code 99322?

ZIP code 99322 (Bickleton, WA) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Bickleton, WA?

The median last spring frost (32 °F) near 99322 is May 16; after June 10 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bickleton station.

When is the first frost in Bickleton, WA?

The median first fall frost near 99322 is October 9, giving a median frost-free growing season of 144 days.

When should I plant tomatoes in 99322?

Start tomato seeds indoors around Mar 21 – Apr 4 and set transplants outside around May 23 – Jun 6, one to three weeks after the median last frost.

How much rain and snow does 99322 get?

About 15 inches of precipitation a year and 31 inches of snowfall (NOAA 1991–2020 normals, Bickleton station).

How hot do summers get in Bickleton, WA?

The average high peaks at 81 °F in July, with about 14 days a year at 90 °F or more.

What kind of soil does 99322 have?

The USDA soil survey maps Mikkalo at the center of ZIP 99322: silt loam, well drained, pH about 7.2 (neutral).

Did spring come early in Bickleton, WA in 2026?

Spring leaf-out near 99322 came on Mar 21 in 2026, 10 days earlier than the 1991–2020 average (Mar 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bickleton, WA?

Long-day onions: the longest day near 99322 is 15 h 45 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 99322 change?

Yes. The 2012 USDA map put 99322 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.