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

Planting zone for 98359 — Olalla, WA

ZIP code 98359 (Olalla, Kitsap County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 29 and the first fall frost November 14.

Where ZIP 98359 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostMar 29
First frostNov 14
2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Olalla, 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 Olalla, WA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 29median — 50% chance of a later frost
Safe for tender plantsApril 24only 10% chance of frost after
First fall frostNovember 14median — 10% chance by Oct 26
Growing season227 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 27 and returns around November 30.

From the NOAA station Bremerton, WA — 11 miles away, elevation 112 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 98359

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 15 – Mar 1
SpinachSow outdoors · Feb 15 – Mar 8
Broccoli, cabbageStart indoors · Jan 18 – Feb 1
Broccoli, cabbageTransplant · Mar 8 – Mar 22
Onion setsPlant outdoors · Mar 1 – Mar 15
PotatoesPlant outdoors · Mar 8 – Mar 22
LettuceSow outdoors · Mar 1 – Mar 15
Carrots, beetsSow outdoors · Mar 8 – Mar 22
TomatoesStart indoors · Feb 1 – Feb 15
TomatoesTransplant · Apr 5 – Apr 19
Peppers, eggplantStart indoors · Jan 18 – Feb 1
Peppers, eggplantTransplant · Apr 12 – Apr 26
BeansSow outdoors · Apr 5 – Apr 19
Sweet cornSow outdoors · Apr 5 – Apr 19
Cucumbers, squashSow outdoors · Apr 5 – Apr 19
Fall lettuce, spinachSow outdoors · Sep 19 – Oct 3
GarlicPlant cloves · Oct 31 – Dec 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 14) 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 98359 came on Feb 18 — 3 days earlier than the 1991–2020 average (Feb 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).

Soil in Olalla, WA

The soil mapped at the center of ZIP 98359 is Neilton — gravelly loamy sand, excessively drained.

TextureGravelly loamy sanddrains and warms fast; dries out and needs more feeding
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter6%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Neilton gravelly loamy sand, 0 to 3 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 98359; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Olalla, WA

Summer high77 °Faverage high, July
Winter low35 °Faverage low, February
Hot days4days a year at 90 °F or more
Freezing nights42nights a year at 32 °F or less
Growing degree days2,058base 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)
Precipitation47.9 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°32 °FJanuary: average high 47 °F, low 36 °F 47°36° JanFebruary: average high 49 °F, low 35 °F 49°35° FebMarch: average high 54 °F, low 38 °F 54°38° MarApril: average high 59 °F, low 41 °F 59°41° AprMay: average high 66 °F, low 47 °F 66°47° MayJune: average high 70 °F, low 51 °F 70°51° JunJuly: average high 77 °F, low 55 °F 77°55° JulAugust: average high 77 °F, low 55 °F 77°55° AugSeptember: average high 72 °F, low 51 °F 72°51° SepOctober: average high 61 °F, low 45 °F 61°45° OctNovember: average high 51 °F, low 39 °F 51°39° NovDecember: average high 46 °F, low 35 °F 46°35° Dec

Precipitation by month inches

0″2″4″6″8″January: 8.09 in precipitation 8.1 JanFebruary: 3.78 in precipitation 3.8 FebMarch: 5.22 in precipitation 5.2 MarApril: 3.45 in precipitation 3.5 AprMay: 2.09 in precipitation 2.1 MayJune: 1.44 in precipitation 1.4 JunJuly: 0.72 in precipitation 0.7 JulAugust: 0.93 in precipitation 0.9 AugSeptember: 1.70 in precipitation 1.7 SepOctober: 4.65 in precipitation 4.7 OctNovember: 7.50 in precipitation 7.5 NovDecember: 8.35 in precipitation 8.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bremerton, WA (11 mi away); precipitation: Southworth 2.7 Sse, 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.

983229a
Burley, WA · 3 mi
983328b
Gig Harbor, WA · 4 mi
983678b
Port Orchard, WA · 5 mi
983958b
Wauna, WA · 5 mi
980709a
Vashon, WA · 5 mi
980139a
Burton, WA · 6 mi
983849a
South Colby, WA · 6 mi
983869a
Southworth, WA · 7 mi

Washington planting zones →

Questions about 98359

What planting zone is ZIP code 98359?

ZIP code 98359 (Olalla, WA) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Olalla, WA?

The median last spring frost (32 °F) near 98359 is March 29; after April 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bremerton station.

When is the first frost in Olalla, WA?

The median first fall frost near 98359 is November 14, giving a median frost-free growing season of 227 days.

When should I plant tomatoes in 98359?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 98359 get?

About 47.9 inches of precipitation a year (NOAA 1991–2020 normals, Southworth 2.7 Sse station).

How hot do summers get in Olalla, WA?

The average high peaks at 77 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 98359 have?

The USDA soil survey maps Neilton at the center of ZIP 98359: gravelly loamy sand, excessively drained, pH about 5.3 (strongly acidic).

Did spring come early in Olalla, WA in 2026?

Spring leaf-out near 98359 came on Feb 18 in 2026, 3 days earlier than the 1991–2020 average (Feb 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Olalla, WA?

Long-day onions: the longest day near 98359 is 15 h 58 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).