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

Planting zone for 98670 — Wahkiacus, WA

ZIP code 98670 (Wahkiacus, Klickitat County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is May 12 and the first fall frost October 11.

Where ZIP 98670 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 12
First frostOct 11
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 Wahkiacus, 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 Wahkiacus, WA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 12median — 50% chance of a later frost
Safe for tender plantsJune 7only 10% chance of frost after
First fall frostOctober 11median — 10% chance by Sep 24
Growing season149 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around October 28.

From the NOAA station Snowden, WA — 11 miles away, elevation 2,415 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 98670

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 31 – Apr 14
SpinachSow outdoors · Mar 31 – Apr 21
Broccoli, cabbageStart indoors · Mar 3 – Mar 17
Broccoli, cabbageTransplant · Apr 21 – May 5
Onion setsPlant outdoors · Apr 14 – Apr 28
PotatoesPlant outdoors · Apr 21 – May 5
LettuceSow outdoors · Apr 14 – Apr 28
Carrots, beetsSow outdoors · Apr 21 – May 5
TomatoesStart indoors · Mar 17 – Mar 31
TomatoesTransplant · May 19 – Jun 2
Peppers, eggplantStart indoors · Mar 3 – Mar 17
Peppers, eggplantTransplant · May 26 – Jun 9
BeansSow outdoors · May 19 – Jun 2
Sweet cornSow outdoors · May 19 – Jun 2
Cucumbers, squashSow outdoors · May 19 – Jun 2
Fall lettuce, spinachSow outdoors · Aug 16 – Aug 30
GarlicPlant cloves · Sep 27 – Nov 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 12) and first fall frost (Oct 11) 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 98670 came on Mar 20 — 16 days earlier than the 1991–2020 average (Apr 5).

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.

Trees 31

Alaska cedar75 ft · blooms mid spring · low shade tolerance · to −22 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigleaf maple60 ft · blooms mid spring · medium shade tolerance · to −14 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °F

Shrubs 105

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FBarclay's willow15 ft · high shade tolerance · to −43 °F

Wildflowers & perennials 284

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °F

Grasses 157

Alaska brome5 ft · blooms late spring · low shade tolerance · to −18 °FAlaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °F

Vines 3

riverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

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 Wahkiacus, WA.

Soil in Wahkiacus, WA

The soil mapped at the center of ZIP 98670 is Dalig — loam, well drained.

TextureLoama good balance for most vegetables
pH6.3slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Dalig loam, 8 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 98670; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Wahkiacus, WA

Summer high79 °Faverage high, July
Winter low25 °Faverage low, December
Hot days8days a year at 90 °F or more
Freezing nights141nights a year at 32 °F or less
Growing degree days1,504base 50 °F — the season’s usable heat
Longest day15 h 44 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)
Precipitation29.8 inper year, rain and melted snow
Snowfall65 inper year; 42 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 38 °F, low 26 °F 38°26° JanFebruary: average high 42 °F, low 26 °F 42°26° FebMarch: average high 48 °F, low 30 °F 48°30° MarApril: average high 55 °F, low 35 °F 55°35° AprMay: average high 63 °F, low 40 °F 63°40° MayJune: average high 68 °F, low 44 °F 68°44° JunJuly: average high 79 °F, low 49 °F 79°49° JulAugust: average high 79 °F, low 49 °F 79°49° AugSeptember: average high 72 °F, low 45 °F 72°45° SepOctober: average high 58 °F, low 37 °F 58°37° OctNovember: average high 45 °F, low 31 °F 45°31° NovDecember: average high 36 °F, low 25 °F 36°25° Dec

Precipitation by month inches · ❄ = snowfall

0″2″4″6″January: 5.25 in precipitation, 22.2 in snowfall 5.3❄22 JanFebruary: 3.50 in precipitation, 7.1 in snowfall 3.5❄7 FebMarch: 3.08 in precipitation, 6 in snowfall 3.1❄6 MarApril: 1.28 in precipitation, 0.1 in snowfall 1.3 AprMay: 1.41 in precipitation 1.4 MayJune: 0.58 in precipitation 0.6 JunJuly: 0.27 in precipitation 0.3 JulAugust: 0.46 in precipitation 0.5 AugSeptember: 0.91 in precipitation 0.9 SepOctober: 2.79 in precipitation, 0.3 in snowfall 2.8 OctNovember: 4.18 in precipitation, 6.2 in snowfall 4.2❄6 NovDecember: 6.09 in precipitation, 23.4 in snowfall 6.1❄23 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Snowden, WA (11 mi away); precipitation: Glenwood #2, WA (12 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.

986287b
Klickitat, WA · 4 mi
986027a
Appleton, WA · 6 mi
986357b
Lyle, WA · 8 mi
986197a
Glenwood, WA · 9 mi
986137b
Centerville, WA · 11 mi
986178a
Dallesport, WA · 15 mi
986737b
Wishram, WA · 16 mi
986727b
White Salmon, WA · 16 mi

Washington planting zones →

Questions about 98670

What planting zone is ZIP code 98670?

ZIP code 98670 (Wahkiacus, 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 Wahkiacus, WA?

The median last spring frost (32 °F) near 98670 is May 12; after June 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Snowden station.

When is the first frost in Wahkiacus, WA?

The median first fall frost near 98670 is October 11, giving a median frost-free growing season of 149 days.

When should I plant tomatoes in 98670?

Start tomato seeds indoors around Mar 17 – Mar 31 and set transplants outside around May 19 – Jun 2, one to three weeks after the median last frost.

How much rain and snow does 98670 get?

About 29.8 inches of precipitation a year and 65 inches of snowfall (NOAA 1991–2020 normals, Glenwood #2 station).

How hot do summers get in Wahkiacus, WA?

The average high peaks at 79 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 98670 have?

The USDA soil survey maps Dalig at the center of ZIP 98670: loam, well drained, pH about 6.3 (slightly acidic).

Did spring come early in Wahkiacus, WA in 2026?

Spring leaf-out near 98670 came on Mar 20 in 2026, 16 days earlier than the 1991–2020 average (Apr 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Wahkiacus, WA?

Long-day onions: the longest day near 98670 is 15 h 44 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 98670 change?

Yes. The 2012 USDA map put 98670 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.