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

Planting zone for 98336 — Glenoma, WA

ZIP code 98336 (Glenoma, Lewis County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is April 24 and the first fall frost October 15.

Where ZIP 98336 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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostApr 24
First frostOct 15
2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Glenoma, 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 Glenoma, WA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 24median — 50% chance of a later frost
Safe for tender plantsMay 12only 10% chance of frost after
First fall frostOctober 15median — 10% chance by Sep 24
Growing season176 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 26 and returns around November 5.

From the NOAA station Glenoma, WA — 6 miles away, elevation 840 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 98336

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 13 – Mar 27
SpinachSow outdoors · Mar 13 – Apr 3
Broccoli, cabbageStart indoors · Feb 13 – Feb 27
Broccoli, cabbageTransplant · Apr 3 – Apr 17
Onion setsPlant outdoors · Mar 27 – Apr 10
PotatoesPlant outdoors · Apr 3 – Apr 17
LettuceSow outdoors · Mar 27 – Apr 10
Carrots, beetsSow outdoors · Apr 3 – Apr 17
TomatoesStart indoors · Feb 27 – Mar 13
TomatoesTransplant · May 1 – May 15
Peppers, eggplantStart indoors · Feb 13 – Feb 27
Peppers, eggplantTransplant · May 8 – May 22
BeansSow outdoors · May 1 – May 15
Sweet cornSow outdoors · May 1 – May 15
Cucumbers, squashSow outdoors · May 1 – May 15
Fall lettuce, spinachSow outdoors · Aug 20 – Sep 3
GarlicPlant cloves · Oct 1 – Nov 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 24) and first fall frost (Oct 15) 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 98336 came on Mar 13 — 34 days earlier than the 1991–2020 average (Apr 16).

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 8a in Washington

611 plants native to the lower 48 states, recorded in Washington, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 113

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 292

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 Glenoma, WA.

Soil in Glenoma, WA

The soil mapped at the center of ZIP 98336 is Cattcreek — very gravelly loamy sand, well drained.

TextureVery gravelly loamy sanddrains and warms fast; dries out and needs more feeding
pH6.1slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter5.5%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Cattcreek-Rock outcrop complex, 30 to 65 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 98336; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glenoma, WA

Summer high80 °Faverage high, August
Winter low32 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights82nights a year at 32 °F or less
Growing degree days1,713base 50 °F — the season’s usable heat
Longest day15 h 50 mindaylight on June 21
Shortest day8 h 34 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation81.6 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 45 °F, low 32 °F 45°32° JanFebruary: average high 49 °F, low 32 °F 49°32° FebMarch: average high 53 °F, low 34 °F 53°34° MarApril: average high 59 °F, low 37 °F 59°37° AprMay: average high 67 °F, low 42 °F 67°42° MayJune: average high 72 °F, low 47 °F 72°47° JunJuly: average high 79 °F, low 50 °F 79°50° JulAugust: average high 80 °F, low 48 °F 80°48° AugSeptember: average high 73 °F, low 44 °F 73°44° SepOctober: average high 61 °F, low 39 °F 61°39° OctNovember: average high 50 °F, low 34 °F 50°34° NovDecember: average high 44 °F, low 32 °F 44°32° Dec

Precipitation by month inches

0″2″4″6″8″10″12″January: 12.07 in precipitation 12.1 JanFebruary: 10.05 in precipitation 10.1 FebMarch: 9.65 in precipitation 9.7 MarApril: 6.54 in precipitation 6.5 AprMay: 4.32 in precipitation 4.3 MayJune: 3.04 in precipitation 3.0 JunJuly: 0.99 in precipitation 1.0 JulAugust: 1.38 in precipitation 1.4 AugSeptember: 2.98 in precipitation 3.0 SepOctober: 6.95 in precipitation 7.0 OctNovember: 11.61 in precipitation 11.6 NovDecember: 12.02 in precipitation 12.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Glenoma, WA (6 mi away); precipitation: Mineral 0.2 S, WA (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

983558a
Mineral, WA · 8 mi
983568b
Morton, WA · 9 mi
983308a
Elbe, WA · 12 mi
983778a
Randle, WA · 14 mi
985338b
Cinebar, WA · 16 mi
983977b
Longmire, WA · 16 mi
985858b
Silver Creek, WA · 18 mi
983288b
Eatonville, WA · 18 mi

Washington planting zones →

Questions about 98336

What planting zone is ZIP code 98336?

ZIP code 98336 (Glenoma, WA) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Glenoma, WA?

The median last spring frost (32 °F) near 98336 is April 24; after May 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Glenoma station.

When is the first frost in Glenoma, WA?

The median first fall frost near 98336 is October 15, giving a median frost-free growing season of 176 days.

When should I plant tomatoes in 98336?

Start tomato seeds indoors around Feb 27 – Mar 13 and set transplants outside around May 1 – May 15, one to three weeks after the median last frost.

How much rain and snow does 98336 get?

About 81.6 inches of precipitation a year (NOAA 1991–2020 normals, Mineral 0.2 S station).

How hot do summers get in Glenoma, WA?

The average high peaks at 80 °F in August, with about 7 days a year at 90 °F or more.

What kind of soil does 98336 have?

The USDA soil survey maps Cattcreek at the center of ZIP 98336: very gravelly loamy sand, well drained, pH about 6.1 (slightly acidic).

Did spring come early in Glenoma, WA in 2026?

Spring leaf-out near 98336 came on Mar 13 in 2026, 34 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glenoma, WA?

Long-day onions: the longest day near 98336 is 15 h 50 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).