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

Planting zone for Bremerton, WA

Bremerton, WA is in USDA zones 8b to 9a across its 4 ZIP codes. The median last spring frost is March 29 and the first fall frost November 14.

Bremerton on the zone map

Outlined: its 4 ZIP code areas · 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.

Zones8b–9a15 to 25 °F

ZIP codes4

Last frostMar 29

First frostNov 14

Growing season227 days

8b 2 ZIPs 9a 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Bremerton, 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, 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 Bremerton

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 98337 came on Feb 8 — 11 days earlier than the 1991–2020 average (Feb 19).

average
Feb 192026
Feb 8

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 8b in Washington

614 plants native to the lower 48 states, recorded in Washington, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. 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 Bremerton, WA.

Soil in Bremerton, WA

The soil mapped at the center of ZIP 98337 is Alderwood — gravelly sandy loam, moderately well drained.

TextureGravelly sandy loamdrains and warms fast; dries out and needs more feeding

pH5.8moderately acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter9%high

Hydrologic groupBwater soaks in moderately

Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Alderwood gravelly sandy 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 98337; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bremerton, 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 59 mindaylight on June 21

Shortest day8 h 25 mindaylight on December 21

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

Precipitation56.9 inper year, rain and melted snow

Snowfall3 inper year; 2 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: Bremerton, WA (2 mi away); precipitation: Bremerton, WA (2 mi away). Daylight is calculated from latitude.

ZIP codes in Bremerton

Washington planting zones →

Questions about Bremerton

What planting zone is Bremerton, WA?

Bremerton, WA is in USDA hardiness zones 8b to 9a on the 2023 map (8b: 15 to 20 °F; 9a: 20 to 25 °F).

When is the last frost in Bremerton, WA?

The median last spring frost is March 29 and the median first fall frost is November 14 (NOAA 1991–2020 normals, Bremerton station).

When can I plant a garden in Bremerton, WA?

Cool-season crops like peas and spinach go in around Feb 15 – Mar 8; tomatoes, peppers, beans and squash after about Apr 5, once frost risk has passed.

What kind of onions grow in Bremerton, WA?

Long-day onions: the longest day is 15 h 59 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Bremerton, WA get?

About 56.9 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals).