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

Planting zone for 98068 — Snoqualmie Pass, WA

ZIP code 98068 (Snoqualmie Pass, King County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 14 and the first fall frost October 17.

Where ZIP 98068 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 frostMay 14

First frostOct 17

2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Snoqualmie Pass, 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 Snoqualmie Pass, WA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 14median — 50% chance of a later frost

Safe for tender plantsJune 5only 10% chance of frost after

First fall frostOctober 17median — 10% chance by Oct 1

Growing season154 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 21 and returns around November 2.

From the NOAA station Stampede Pass, WA — 11 miles away, elevation 3,960 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 98068

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 2 – Apr 16

SpinachSow outdoors · Apr 2 – Apr 23

Broccoli, cabbageStart indoors · Mar 5 – Mar 19

Broccoli, cabbageTransplant · Apr 23 – May 7

Onion setsPlant outdoors · Apr 16 – Apr 30

PotatoesPlant outdoors · Apr 23 – May 7

LettuceSow outdoors · Apr 16 – Apr 30

Carrots, beetsSow outdoors · Apr 23 – May 7

TomatoesStart indoors · Mar 19 – Apr 2

TomatoesTransplant · May 21 – Jun 4

Peppers, eggplantStart indoors · Mar 5 – Mar 19

Peppers, eggplantTransplant · May 28 – Jun 11

BeansSow outdoors · May 21 – Jun 4

Sweet cornSow outdoors · May 21 – Jun 4

Cucumbers, squashSow outdoors · May 21 – Jun 4

Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5

GarlicPlant cloves · Oct 3 – Nov 7

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 14) and first fall frost (Oct 17) 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 98068 came on Apr 30 — about the same time as the 1991–2020 average (May 1).

average
May 12026
Apr 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 Snoqualmie Pass, WA.

Soil in Snoqualmie Pass, WA

The center of ZIP 98068 is mapped as Rock outcrop-Rubble land-Glaciers, icefields complex, 30 to 90 percent slopes: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 98068; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Snoqualmie Pass, WA

Summer high69 °Faverage high, August

Winter low24 °Faverage low, December

Hot days0days a year at 90 °F or more

Freezing nights165nights a year at 32 °F or less

Growing degree days999base 50 °F — the season’s usable heat

Longest day15 h 58 mindaylight on June 21

Shortest day8 h 27 mindaylight on December 21

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

Precipitation124.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Stampede Pass, WA (11 mi away); precipitation: Olallie Meadows, WA (5 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.

989257a

Easton, WA · 11 mi

982888a

Skykomish, WA · 13 mi

980458a

North Bend, WA · 15 mi

989407a

Ronald, WA · 16 mi

980658b

Snoqualmie, WA · 22 mi

Washington planting zones →

Questions about 98068

What planting zone is ZIP code 98068?

ZIP code 98068 (Snoqualmie Pass, 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 Snoqualmie Pass, WA?

The median last spring frost (32 °F) near 98068 is May 14; after June 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Stampede Pass station.

When is the first frost in Snoqualmie Pass, WA?

The median first fall frost near 98068 is October 17, giving a median frost-free growing season of 154 days.

When should I plant tomatoes in 98068?

Start tomato seeds indoors around Mar 19 – Apr 2 and set transplants outside around May 21 – Jun 4, one to three weeks after the median last frost.

How much rain and snow does 98068 get?

About 124.9 inches of precipitation a year (NOAA 1991–2020 normals, Olallie Meadows station).

How hot do summers get in Snoqualmie Pass, WA?

The average high peaks at 69 °F in August, with about 0 days a year at 90 °F or more.

Did spring come early in Snoqualmie Pass, WA in 2026?

Spring leaf-out near 98068 came on Apr 30 in 2026, about the same as the 1991–2020 average (May 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Snoqualmie Pass, WA?

Long-day onions: the longest day near 98068 is 15 h 58 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).